| /* Scanning of rtl for dataflow analysis. |
| Copyright (C) 1999-2021 Free Software Foundation, Inc. |
| Originally contributed by Michael P. Hayes |
| (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com) |
| Major rewrite contributed by Danny Berlin (dberlin@dberlin.org) |
| and Kenneth Zadeck (zadeck@naturalbridge.com). |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "backend.h" |
| #include "target.h" |
| #include "rtl.h" |
| #include "tree.h" |
| #include "df.h" |
| #include "memmodel.h" |
| #include "tm_p.h" |
| #include "regs.h" |
| #include "emit-rtl.h" /* FIXME: Can go away once crtl is moved to rtl.h. */ |
| #include "dumpfile.h" |
| #include "calls.h" |
| #include "function-abi.h" |
| |
| /* The set of hard registers in eliminables[i].from. */ |
| |
| static HARD_REG_SET elim_reg_set; |
| |
| /* Initialize ur_in and ur_out as if all hard registers were partially |
| available. */ |
| |
| class df_collection_rec |
| { |
| public: |
| auto_vec<df_ref, 128> def_vec; |
| auto_vec<df_ref, 32> use_vec; |
| auto_vec<df_ref, 32> eq_use_vec; |
| auto_vec<df_mw_hardreg *, 32> mw_vec; |
| }; |
| |
| static void df_ref_record (enum df_ref_class, class df_collection_rec *, |
| rtx, rtx *, |
| basic_block, struct df_insn_info *, |
| enum df_ref_type, int ref_flags); |
| static void df_def_record_1 (class df_collection_rec *, rtx *, |
| basic_block, struct df_insn_info *, |
| int ref_flags); |
| static void df_defs_record (class df_collection_rec *, rtx, |
| basic_block, struct df_insn_info *, |
| int ref_flags); |
| static void df_uses_record (class df_collection_rec *, |
| rtx *, enum df_ref_type, |
| basic_block, struct df_insn_info *, |
| int ref_flags); |
| |
| static void df_install_ref_incremental (df_ref); |
| static void df_insn_refs_collect (class df_collection_rec*, |
| basic_block, struct df_insn_info *); |
| static void df_canonize_collection_rec (class df_collection_rec *); |
| |
| static void df_get_regular_block_artificial_uses (bitmap); |
| static void df_get_eh_block_artificial_uses (bitmap); |
| |
| static void df_record_entry_block_defs (bitmap); |
| static void df_record_exit_block_uses (bitmap); |
| static void df_get_exit_block_use_set (bitmap); |
| static void df_get_entry_block_def_set (bitmap); |
| static void df_grow_ref_info (struct df_ref_info *, unsigned int); |
| static void df_ref_chain_delete_du_chain (df_ref); |
| static void df_ref_chain_delete (df_ref); |
| |
| static void df_refs_add_to_chains (class df_collection_rec *, |
| basic_block, rtx_insn *, unsigned int); |
| |
| static bool df_insn_refs_verify (class df_collection_rec *, basic_block, |
| rtx_insn *, bool); |
| static void df_entry_block_defs_collect (class df_collection_rec *, bitmap); |
| static void df_exit_block_uses_collect (class df_collection_rec *, bitmap); |
| static void df_install_ref (df_ref, struct df_reg_info *, |
| struct df_ref_info *, bool); |
| |
| static int df_ref_compare (df_ref, df_ref); |
| static int df_ref_ptr_compare (const void *, const void *); |
| static int df_mw_compare (const df_mw_hardreg *, const df_mw_hardreg *); |
| static int df_mw_ptr_compare (const void *, const void *); |
| |
| static void df_insn_info_delete (unsigned int); |
| |
| /* Indexed by hardware reg number, is true if that register is ever |
| used in the current function. |
| |
| In df-scan.c, this is set up to record the hard regs used |
| explicitly. Reload adds in the hard regs used for holding pseudo |
| regs. Final uses it to generate the code in the function prologue |
| and epilogue to save and restore registers as needed. */ |
| |
| static bool regs_ever_live[FIRST_PSEUDO_REGISTER]; |
| |
| /* Flags used to tell df_refs_add_to_chains() which vectors it should copy. */ |
| static const unsigned int copy_defs = 0x1; |
| static const unsigned int copy_uses = 0x2; |
| static const unsigned int copy_eq_uses = 0x4; |
| static const unsigned int copy_mw = 0x8; |
| static const unsigned int copy_all = copy_defs | copy_uses | copy_eq_uses |
| | copy_mw; |
| |
| /*---------------------------------------------------------------------------- |
| SCANNING DATAFLOW PROBLEM |
| |
| There are several ways in which scanning looks just like the other |
| dataflow problems. It shares the all the mechanisms for local info |
| as well as basic block info. Where it differs is when and how often |
| it gets run. It also has no need for the iterative solver. |
| ----------------------------------------------------------------------------*/ |
| |
| /* Problem data for the scanning dataflow function. */ |
| struct df_scan_problem_data |
| { |
| object_allocator<df_base_ref> *ref_base_pool; |
| object_allocator<df_artificial_ref> *ref_artificial_pool; |
| object_allocator<df_regular_ref> *ref_regular_pool; |
| object_allocator<df_insn_info> *insn_pool; |
| object_allocator<df_reg_info> *reg_pool; |
| object_allocator<df_mw_hardreg> *mw_reg_pool; |
| |
| bitmap_obstack reg_bitmaps; |
| bitmap_obstack insn_bitmaps; |
| }; |
| |
| /* Internal function to shut down the scanning problem. */ |
| static void |
| df_scan_free_internal (void) |
| { |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| |
| free (df->def_info.refs); |
| free (df->def_info.begin); |
| free (df->def_info.count); |
| memset (&df->def_info, 0, (sizeof (struct df_ref_info))); |
| |
| free (df->use_info.refs); |
| free (df->use_info.begin); |
| free (df->use_info.count); |
| memset (&df->use_info, 0, (sizeof (struct df_ref_info))); |
| |
| free (df->def_regs); |
| df->def_regs = NULL; |
| free (df->use_regs); |
| df->use_regs = NULL; |
| free (df->eq_use_regs); |
| df->eq_use_regs = NULL; |
| df->regs_size = 0; |
| DF_REG_SIZE (df) = 0; |
| |
| free (df->insns); |
| df->insns = NULL; |
| DF_INSN_SIZE () = 0; |
| |
| free (df_scan->block_info); |
| df_scan->block_info = NULL; |
| df_scan->block_info_size = 0; |
| |
| bitmap_clear (&df->hardware_regs_used); |
| bitmap_clear (&df->regular_block_artificial_uses); |
| bitmap_clear (&df->eh_block_artificial_uses); |
| BITMAP_FREE (df->entry_block_defs); |
| BITMAP_FREE (df->exit_block_uses); |
| bitmap_clear (&df->insns_to_delete); |
| bitmap_clear (&df->insns_to_rescan); |
| bitmap_clear (&df->insns_to_notes_rescan); |
| |
| delete problem_data->ref_base_pool; |
| delete problem_data->ref_artificial_pool; |
| delete problem_data->ref_regular_pool; |
| delete problem_data->insn_pool; |
| delete problem_data->reg_pool; |
| delete problem_data->mw_reg_pool; |
| bitmap_obstack_release (&problem_data->reg_bitmaps); |
| bitmap_obstack_release (&problem_data->insn_bitmaps); |
| free (df_scan->problem_data); |
| } |
| |
| |
| /* Free basic block info. */ |
| |
| static void |
| df_scan_free_bb_info (basic_block bb, void *vbb_info) |
| { |
| struct df_scan_bb_info *bb_info = (struct df_scan_bb_info *) vbb_info; |
| unsigned int bb_index = bb->index; |
| rtx_insn *insn; |
| |
| FOR_BB_INSNS (bb, insn) |
| if (INSN_P (insn)) |
| df_insn_info_delete (INSN_UID (insn)); |
| |
| if (bb_index < df_scan->block_info_size) |
| bb_info = df_scan_get_bb_info (bb_index); |
| |
| /* Get rid of any artificial uses or defs. */ |
| df_ref_chain_delete_du_chain (bb_info->artificial_defs); |
| df_ref_chain_delete_du_chain (bb_info->artificial_uses); |
| df_ref_chain_delete (bb_info->artificial_defs); |
| df_ref_chain_delete (bb_info->artificial_uses); |
| bb_info->artificial_defs = NULL; |
| bb_info->artificial_uses = NULL; |
| } |
| |
| |
| /* Allocate the problem data for the scanning problem. This should be |
| called when the problem is created or when the entire function is to |
| be rescanned. */ |
| void |
| df_scan_alloc (bitmap all_blocks ATTRIBUTE_UNUSED) |
| { |
| struct df_scan_problem_data *problem_data; |
| basic_block bb; |
| |
| /* Given the number of pools, this is really faster than tearing |
| everything apart. */ |
| if (df_scan->problem_data) |
| df_scan_free_internal (); |
| |
| problem_data = XNEW (struct df_scan_problem_data); |
| df_scan->problem_data = problem_data; |
| df_scan->computed = true; |
| |
| problem_data->ref_base_pool = new object_allocator<df_base_ref> |
| ("df_scan ref base"); |
| problem_data->ref_artificial_pool = new object_allocator<df_artificial_ref> |
| ("df_scan ref artificial"); |
| problem_data->ref_regular_pool = new object_allocator<df_regular_ref> |
| ("df_scan ref regular"); |
| problem_data->insn_pool = new object_allocator<df_insn_info> |
| ("df_scan insn"); |
| problem_data->reg_pool = new object_allocator<df_reg_info> |
| ("df_scan reg"); |
| problem_data->mw_reg_pool = new object_allocator<df_mw_hardreg> |
| ("df_scan mw_reg"); |
| |
| bitmap_obstack_initialize (&problem_data->reg_bitmaps); |
| bitmap_obstack_initialize (&problem_data->insn_bitmaps); |
| |
| df_grow_reg_info (); |
| |
| df_grow_insn_info (); |
| df_grow_bb_info (df_scan); |
| |
| FOR_ALL_BB_FN (bb, cfun) |
| { |
| unsigned int bb_index = bb->index; |
| struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb_index); |
| bb_info->artificial_defs = NULL; |
| bb_info->artificial_uses = NULL; |
| } |
| |
| bitmap_initialize (&df->hardware_regs_used, &problem_data->reg_bitmaps); |
| bitmap_initialize (&df->regular_block_artificial_uses, &problem_data->reg_bitmaps); |
| bitmap_initialize (&df->eh_block_artificial_uses, &problem_data->reg_bitmaps); |
| df->entry_block_defs = BITMAP_ALLOC (&problem_data->reg_bitmaps); |
| df->exit_block_uses = BITMAP_ALLOC (&problem_data->reg_bitmaps); |
| bitmap_initialize (&df->insns_to_delete, &problem_data->insn_bitmaps); |
| bitmap_initialize (&df->insns_to_rescan, &problem_data->insn_bitmaps); |
| bitmap_initialize (&df->insns_to_notes_rescan, &problem_data->insn_bitmaps); |
| df_scan->optional_p = false; |
| } |
| |
| |
| /* Free all of the data associated with the scan problem. */ |
| |
| static void |
| df_scan_free (void) |
| { |
| if (df_scan->problem_data) |
| df_scan_free_internal (); |
| |
| if (df->blocks_to_analyze) |
| { |
| BITMAP_FREE (df->blocks_to_analyze); |
| df->blocks_to_analyze = NULL; |
| } |
| |
| free (df_scan); |
| } |
| |
| /* Dump the preamble for DF_SCAN dump. */ |
| static void |
| df_scan_start_dump (FILE *file ATTRIBUTE_UNUSED) |
| { |
| int i; |
| int dcount = 0; |
| int ucount = 0; |
| int ecount = 0; |
| int icount = 0; |
| int ccount = 0; |
| basic_block bb; |
| rtx_insn *insn; |
| |
| fprintf (file, ";; fully invalidated by EH \t"); |
| df_print_regset |
| (file, bitmap_view<HARD_REG_SET> (eh_edge_abi.full_reg_clobbers ())); |
| fprintf (file, ";; hardware regs used \t"); |
| df_print_regset (file, &df->hardware_regs_used); |
| fprintf (file, ";; regular block artificial uses \t"); |
| df_print_regset (file, &df->regular_block_artificial_uses); |
| fprintf (file, ";; eh block artificial uses \t"); |
| df_print_regset (file, &df->eh_block_artificial_uses); |
| fprintf (file, ";; entry block defs \t"); |
| df_print_regset (file, df->entry_block_defs); |
| fprintf (file, ";; exit block uses \t"); |
| df_print_regset (file, df->exit_block_uses); |
| fprintf (file, ";; regs ever live \t"); |
| for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
| if (df_regs_ever_live_p (i)) |
| fprintf (file, " %d [%s]", i, reg_names[i]); |
| fprintf (file, "\n;; ref usage \t"); |
| |
| for (i = 0; i < (int)df->regs_inited; i++) |
| if (DF_REG_DEF_COUNT (i) || DF_REG_USE_COUNT (i) || DF_REG_EQ_USE_COUNT (i)) |
| { |
| const char * sep = ""; |
| |
| fprintf (file, "r%d={", i); |
| if (DF_REG_DEF_COUNT (i)) |
| { |
| fprintf (file, "%dd", DF_REG_DEF_COUNT (i)); |
| sep = ","; |
| dcount += DF_REG_DEF_COUNT (i); |
| } |
| if (DF_REG_USE_COUNT (i)) |
| { |
| fprintf (file, "%s%du", sep, DF_REG_USE_COUNT (i)); |
| sep = ","; |
| ucount += DF_REG_USE_COUNT (i); |
| } |
| if (DF_REG_EQ_USE_COUNT (i)) |
| { |
| fprintf (file, "%s%de", sep, DF_REG_EQ_USE_COUNT (i)); |
| ecount += DF_REG_EQ_USE_COUNT (i); |
| } |
| fprintf (file, "} "); |
| } |
| |
| FOR_EACH_BB_FN (bb, cfun) |
| FOR_BB_INSNS (bb, insn) |
| if (INSN_P (insn)) |
| { |
| if (CALL_P (insn)) |
| ccount++; |
| else |
| icount++; |
| } |
| |
| fprintf (file, "\n;; total ref usage %d{%dd,%du,%de}" |
| " in %d{%d regular + %d call} insns.\n", |
| dcount + ucount + ecount, dcount, ucount, ecount, |
| icount + ccount, icount, ccount); |
| } |
| |
| /* Dump the bb_info for a given basic block. */ |
| static void |
| df_scan_start_block (basic_block bb, FILE *file) |
| { |
| struct df_scan_bb_info *bb_info |
| = df_scan_get_bb_info (bb->index); |
| |
| if (bb_info) |
| { |
| fprintf (file, ";; bb %d artificial_defs: ", bb->index); |
| df_refs_chain_dump (bb_info->artificial_defs, true, file); |
| fprintf (file, "\n;; bb %d artificial_uses: ", bb->index); |
| df_refs_chain_dump (bb_info->artificial_uses, true, file); |
| fprintf (file, "\n"); |
| } |
| #if 0 |
| { |
| rtx_insn *insn; |
| FOR_BB_INSNS (bb, insn) |
| if (INSN_P (insn)) |
| df_insn_debug (insn, false, file); |
| } |
| #endif |
| } |
| |
| static const struct df_problem problem_SCAN = |
| { |
| DF_SCAN, /* Problem id. */ |
| DF_NONE, /* Direction. */ |
| df_scan_alloc, /* Allocate the problem specific data. */ |
| NULL, /* Reset global information. */ |
| df_scan_free_bb_info, /* Free basic block info. */ |
| NULL, /* Local compute function. */ |
| NULL, /* Init the solution specific data. */ |
| NULL, /* Iterative solver. */ |
| NULL, /* Confluence operator 0. */ |
| NULL, /* Confluence operator n. */ |
| NULL, /* Transfer function. */ |
| NULL, /* Finalize function. */ |
| df_scan_free, /* Free all of the problem information. */ |
| NULL, /* Remove this problem from the stack of dataflow problems. */ |
| df_scan_start_dump, /* Debugging. */ |
| df_scan_start_block, /* Debugging start block. */ |
| NULL, /* Debugging end block. */ |
| NULL, /* Debugging start insn. */ |
| NULL, /* Debugging end insn. */ |
| NULL, /* Incremental solution verify start. */ |
| NULL, /* Incremental solution verify end. */ |
| NULL, /* Dependent problem. */ |
| sizeof (struct df_scan_bb_info),/* Size of entry of block_info array. */ |
| TV_DF_SCAN, /* Timing variable. */ |
| false /* Reset blocks on dropping out of blocks_to_analyze. */ |
| }; |
| |
| |
| /* Create a new DATAFLOW instance and add it to an existing instance |
| of DF. The returned structure is what is used to get at the |
| solution. */ |
| |
| void |
| df_scan_add_problem (void) |
| { |
| df_add_problem (&problem_SCAN); |
| } |
| |
| |
| /*---------------------------------------------------------------------------- |
| Storage Allocation Utilities |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /* First, grow the reg_info information. If the current size is less than |
| the number of pseudos, grow to 25% more than the number of |
| pseudos. |
| |
| Second, assure that all of the slots up to max_reg_num have been |
| filled with reg_info structures. */ |
| |
| void |
| df_grow_reg_info (void) |
| { |
| unsigned int max_reg = max_reg_num (); |
| unsigned int new_size = max_reg; |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| unsigned int i; |
| |
| if (df->regs_size < new_size) |
| { |
| new_size += new_size / 4; |
| df->def_regs = XRESIZEVEC (struct df_reg_info *, df->def_regs, new_size); |
| df->use_regs = XRESIZEVEC (struct df_reg_info *, df->use_regs, new_size); |
| df->eq_use_regs = XRESIZEVEC (struct df_reg_info *, df->eq_use_regs, |
| new_size); |
| df->def_info.begin = XRESIZEVEC (unsigned, df->def_info.begin, new_size); |
| df->def_info.count = XRESIZEVEC (unsigned, df->def_info.count, new_size); |
| df->use_info.begin = XRESIZEVEC (unsigned, df->use_info.begin, new_size); |
| df->use_info.count = XRESIZEVEC (unsigned, df->use_info.count, new_size); |
| df->regs_size = new_size; |
| } |
| |
| for (i = df->regs_inited; i < max_reg; i++) |
| { |
| struct df_reg_info *reg_info; |
| |
| // TODO |
| reg_info = problem_data->reg_pool->allocate (); |
| memset (reg_info, 0, sizeof (struct df_reg_info)); |
| df->def_regs[i] = reg_info; |
| reg_info = problem_data->reg_pool->allocate (); |
| memset (reg_info, 0, sizeof (struct df_reg_info)); |
| df->use_regs[i] = reg_info; |
| reg_info = problem_data->reg_pool->allocate (); |
| memset (reg_info, 0, sizeof (struct df_reg_info)); |
| df->eq_use_regs[i] = reg_info; |
| df->def_info.begin[i] = 0; |
| df->def_info.count[i] = 0; |
| df->use_info.begin[i] = 0; |
| df->use_info.count[i] = 0; |
| } |
| |
| df->regs_inited = max_reg; |
| } |
| |
| |
| /* Grow the ref information. */ |
| |
| static void |
| df_grow_ref_info (struct df_ref_info *ref_info, unsigned int new_size) |
| { |
| if (ref_info->refs_size < new_size) |
| { |
| ref_info->refs = XRESIZEVEC (df_ref, ref_info->refs, new_size); |
| memset (ref_info->refs + ref_info->refs_size, 0, |
| (new_size - ref_info->refs_size) *sizeof (df_ref)); |
| ref_info->refs_size = new_size; |
| } |
| } |
| |
| |
| /* Check and grow the ref information if necessary. This routine |
| guarantees total_size + BITMAP_ADDEND amount of entries in refs |
| array. It updates ref_info->refs_size only and does not change |
| ref_info->total_size. */ |
| |
| static void |
| df_check_and_grow_ref_info (struct df_ref_info *ref_info, |
| unsigned bitmap_addend) |
| { |
| if (ref_info->refs_size < ref_info->total_size + bitmap_addend) |
| { |
| int new_size = ref_info->total_size + bitmap_addend; |
| new_size += ref_info->total_size / 4; |
| df_grow_ref_info (ref_info, new_size); |
| } |
| } |
| |
| |
| /* Grow the ref information. If the current size is less than the |
| number of instructions, grow to 25% more than the number of |
| instructions. */ |
| |
| void |
| df_grow_insn_info (void) |
| { |
| unsigned int new_size = get_max_uid () + 1; |
| if (DF_INSN_SIZE () < new_size) |
| { |
| new_size += new_size / 4; |
| df->insns = XRESIZEVEC (struct df_insn_info *, df->insns, new_size); |
| memset (df->insns + df->insns_size, 0, |
| (new_size - DF_INSN_SIZE ()) *sizeof (struct df_insn_info *)); |
| DF_INSN_SIZE () = new_size; |
| } |
| } |
| |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| PUBLIC INTERFACES FOR SMALL GRAIN CHANGES TO SCANNING. |
| ----------------------------------------------------------------------------*/ |
| |
| /* Rescan all of the block_to_analyze or all of the blocks in the |
| function if df_set_blocks if blocks_to_analyze is NULL; */ |
| |
| void |
| df_scan_blocks (void) |
| { |
| basic_block bb; |
| |
| df->def_info.ref_order = DF_REF_ORDER_NO_TABLE; |
| df->use_info.ref_order = DF_REF_ORDER_NO_TABLE; |
| |
| df_get_regular_block_artificial_uses (&df->regular_block_artificial_uses); |
| df_get_eh_block_artificial_uses (&df->eh_block_artificial_uses); |
| |
| bitmap_ior_into (&df->eh_block_artificial_uses, |
| &df->regular_block_artificial_uses); |
| |
| /* ENTRY and EXIT blocks have special defs/uses. */ |
| df_get_entry_block_def_set (df->entry_block_defs); |
| df_record_entry_block_defs (df->entry_block_defs); |
| df_get_exit_block_use_set (df->exit_block_uses); |
| df_record_exit_block_uses (df->exit_block_uses); |
| df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, ENTRY_BLOCK)); |
| df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, EXIT_BLOCK)); |
| |
| /* Regular blocks */ |
| FOR_EACH_BB_FN (bb, cfun) |
| { |
| unsigned int bb_index = bb->index; |
| df_bb_refs_record (bb_index, true); |
| } |
| } |
| |
| /* Create new refs under address LOC within INSN. This function is |
| only used externally. REF_FLAGS must be either 0 or DF_REF_IN_NOTE, |
| depending on whether LOC is inside PATTERN (INSN) or a note. */ |
| |
| void |
| df_uses_create (rtx *loc, rtx_insn *insn, int ref_flags) |
| { |
| gcc_assert (!(ref_flags & ~DF_REF_IN_NOTE)); |
| df_uses_record (NULL, loc, DF_REF_REG_USE, |
| BLOCK_FOR_INSN (insn), |
| DF_INSN_INFO_GET (insn), |
| ref_flags); |
| } |
| |
| static void |
| df_install_ref_incremental (df_ref ref) |
| { |
| struct df_reg_info **reg_info; |
| struct df_ref_info *ref_info; |
| df_ref *ref_ptr; |
| bool add_to_table; |
| |
| rtx_insn *insn = DF_REF_INSN (ref); |
| basic_block bb = BLOCK_FOR_INSN (insn); |
| |
| if (DF_REF_REG_DEF_P (ref)) |
| { |
| reg_info = df->def_regs; |
| ref_info = &df->def_info; |
| ref_ptr = &DF_INSN_DEFS (insn); |
| add_to_table = ref_info->ref_order != DF_REF_ORDER_NO_TABLE; |
| } |
| else if (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE) |
| { |
| reg_info = df->eq_use_regs; |
| ref_info = &df->use_info; |
| ref_ptr = &DF_INSN_EQ_USES (insn); |
| switch (ref_info->ref_order) |
| { |
| case DF_REF_ORDER_UNORDERED_WITH_NOTES: |
| case DF_REF_ORDER_BY_REG_WITH_NOTES: |
| case DF_REF_ORDER_BY_INSN_WITH_NOTES: |
| add_to_table = true; |
| break; |
| default: |
| add_to_table = false; |
| break; |
| } |
| } |
| else |
| { |
| reg_info = df->use_regs; |
| ref_info = &df->use_info; |
| ref_ptr = &DF_INSN_USES (insn); |
| add_to_table = ref_info->ref_order != DF_REF_ORDER_NO_TABLE; |
| } |
| |
| /* Do not add if ref is not in the right blocks. */ |
| if (add_to_table && df->analyze_subset) |
| add_to_table = bitmap_bit_p (df->blocks_to_analyze, bb->index); |
| |
| df_install_ref (ref, reg_info[DF_REF_REGNO (ref)], ref_info, add_to_table); |
| |
| if (add_to_table) |
| switch (ref_info->ref_order) |
| { |
| case DF_REF_ORDER_UNORDERED_WITH_NOTES: |
| case DF_REF_ORDER_BY_REG_WITH_NOTES: |
| case DF_REF_ORDER_BY_INSN_WITH_NOTES: |
| ref_info->ref_order = DF_REF_ORDER_UNORDERED_WITH_NOTES; |
| break; |
| default: |
| ref_info->ref_order = DF_REF_ORDER_UNORDERED; |
| break; |
| } |
| |
| while (*ref_ptr && df_ref_compare (*ref_ptr, ref) < 0) |
| ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr); |
| |
| DF_REF_NEXT_LOC (ref) = *ref_ptr; |
| *ref_ptr = ref; |
| |
| #if 0 |
| if (dump_file) |
| { |
| fprintf (dump_file, "adding ref "); |
| df_ref_debug (ref, dump_file); |
| } |
| #endif |
| /* By adding the ref directly, df_insn_rescan my not find any |
| differences even though the block will have changed. So we need |
| to mark the block dirty ourselves. */ |
| if (!DEBUG_INSN_P (DF_REF_INSN (ref))) |
| df_set_bb_dirty (bb); |
| } |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| UTILITIES TO CREATE AND DESTROY REFS AND CHAINS. |
| ----------------------------------------------------------------------------*/ |
| |
| static void |
| df_free_ref (df_ref ref) |
| { |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| |
| switch (DF_REF_CLASS (ref)) |
| { |
| case DF_REF_BASE: |
| problem_data->ref_base_pool->remove ((df_base_ref *) (ref)); |
| break; |
| |
| case DF_REF_ARTIFICIAL: |
| problem_data->ref_artificial_pool->remove |
| ((df_artificial_ref *) (ref)); |
| break; |
| |
| case DF_REF_REGULAR: |
| problem_data->ref_regular_pool->remove |
| ((df_regular_ref *) (ref)); |
| break; |
| } |
| } |
| |
| |
| /* Unlink and delete REF at the reg_use, reg_eq_use or reg_def chain. |
| Also delete the def-use or use-def chain if it exists. */ |
| |
| static void |
| df_reg_chain_unlink (df_ref ref) |
| { |
| df_ref next = DF_REF_NEXT_REG (ref); |
| df_ref prev = DF_REF_PREV_REG (ref); |
| int id = DF_REF_ID (ref); |
| struct df_reg_info *reg_info; |
| df_ref *refs = NULL; |
| |
| if (DF_REF_REG_DEF_P (ref)) |
| { |
| int regno = DF_REF_REGNO (ref); |
| reg_info = DF_REG_DEF_GET (regno); |
| refs = df->def_info.refs; |
| } |
| else |
| { |
| if (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE) |
| { |
| reg_info = DF_REG_EQ_USE_GET (DF_REF_REGNO (ref)); |
| switch (df->use_info.ref_order) |
| { |
| case DF_REF_ORDER_UNORDERED_WITH_NOTES: |
| case DF_REF_ORDER_BY_REG_WITH_NOTES: |
| case DF_REF_ORDER_BY_INSN_WITH_NOTES: |
| refs = df->use_info.refs; |
| break; |
| default: |
| break; |
| } |
| } |
| else |
| { |
| reg_info = DF_REG_USE_GET (DF_REF_REGNO (ref)); |
| refs = df->use_info.refs; |
| } |
| } |
| |
| if (refs) |
| { |
| if (df->analyze_subset) |
| { |
| if (bitmap_bit_p (df->blocks_to_analyze, DF_REF_BBNO (ref))) |
| refs[id] = NULL; |
| } |
| else |
| refs[id] = NULL; |
| } |
| |
| /* Delete any def-use or use-def chains that start here. It is |
| possible that there is trash in this field. This happens for |
| insns that have been deleted when rescanning has been deferred |
| and the chain problem has also been deleted. The chain tear down |
| code skips deleted insns. */ |
| if (df_chain && DF_REF_CHAIN (ref)) |
| df_chain_unlink (ref); |
| |
| reg_info->n_refs--; |
| if (DF_REF_FLAGS_IS_SET (ref, DF_HARD_REG_LIVE)) |
| { |
| gcc_assert (DF_REF_REGNO (ref) < FIRST_PSEUDO_REGISTER); |
| df->hard_regs_live_count[DF_REF_REGNO (ref)]--; |
| } |
| |
| /* Unlink from the reg chain. If there is no prev, this is the |
| first of the list. If not, just join the next and prev. */ |
| if (prev) |
| DF_REF_NEXT_REG (prev) = next; |
| else |
| { |
| gcc_assert (reg_info->reg_chain == ref); |
| reg_info->reg_chain = next; |
| } |
| if (next) |
| DF_REF_PREV_REG (next) = prev; |
| |
| df_free_ref (ref); |
| } |
| |
| /* Initialize INSN_INFO to describe INSN. */ |
| |
| static void |
| df_insn_info_init_fields (df_insn_info *insn_info, rtx_insn *insn) |
| { |
| memset (insn_info, 0, sizeof (struct df_insn_info)); |
| insn_info->insn = insn; |
| } |
| |
| /* Create the insn record for INSN. If there was one there, zero it |
| out. */ |
| |
| struct df_insn_info * |
| df_insn_create_insn_record (rtx_insn *insn) |
| { |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| struct df_insn_info *insn_rec; |
| |
| df_grow_insn_info (); |
| insn_rec = DF_INSN_INFO_GET (insn); |
| if (!insn_rec) |
| { |
| insn_rec = problem_data->insn_pool->allocate (); |
| DF_INSN_INFO_SET (insn, insn_rec); |
| } |
| df_insn_info_init_fields (insn_rec, insn); |
| return insn_rec; |
| } |
| |
| |
| /* Delete all du chain (DF_REF_CHAIN()) of all refs in the ref chain. */ |
| |
| static void |
| df_ref_chain_delete_du_chain (df_ref ref) |
| { |
| for (; ref; ref = DF_REF_NEXT_LOC (ref)) |
| /* CHAIN is allocated by DF_CHAIN. So make sure to |
| pass df_scan instance for the problem. */ |
| if (DF_REF_CHAIN (ref)) |
| df_chain_unlink (ref); |
| } |
| |
| |
| /* Delete all refs in the ref chain. */ |
| |
| static void |
| df_ref_chain_delete (df_ref ref) |
| { |
| df_ref next; |
| for (; ref; ref = next) |
| { |
| next = DF_REF_NEXT_LOC (ref); |
| df_reg_chain_unlink (ref); |
| } |
| } |
| |
| |
| /* Delete the hardreg chain. */ |
| |
| static void |
| df_mw_hardreg_chain_delete (struct df_mw_hardreg *hardregs) |
| { |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| df_mw_hardreg *next; |
| |
| for (; hardregs; hardregs = next) |
| { |
| next = DF_MWS_NEXT (hardregs); |
| problem_data->mw_reg_pool->remove (hardregs); |
| } |
| } |
| |
| /* Remove the contents of INSN_INFO (but don't free INSN_INFO itself). */ |
| |
| static void |
| df_insn_info_free_fields (df_insn_info *insn_info) |
| { |
| /* In general, notes do not have the insn_info fields |
| initialized. However, combine deletes insns by changing them |
| to notes. How clever. So we cannot just check if it is a |
| valid insn before short circuiting this code, we need to see |
| if we actually initialized it. */ |
| df_mw_hardreg_chain_delete (insn_info->mw_hardregs); |
| |
| if (df_chain) |
| { |
| df_ref_chain_delete_du_chain (insn_info->defs); |
| df_ref_chain_delete_du_chain (insn_info->uses); |
| df_ref_chain_delete_du_chain (insn_info->eq_uses); |
| } |
| |
| df_ref_chain_delete (insn_info->defs); |
| df_ref_chain_delete (insn_info->uses); |
| df_ref_chain_delete (insn_info->eq_uses); |
| } |
| |
| /* Delete all of the refs information from the insn with UID. |
| Internal helper for df_insn_delete, df_insn_rescan, and other |
| df-scan routines that don't have to work in deferred mode |
| and do not have to mark basic blocks for re-processing. */ |
| |
| static void |
| df_insn_info_delete (unsigned int uid) |
| { |
| struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); |
| |
| bitmap_clear_bit (&df->insns_to_delete, uid); |
| bitmap_clear_bit (&df->insns_to_rescan, uid); |
| bitmap_clear_bit (&df->insns_to_notes_rescan, uid); |
| if (insn_info) |
| { |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| |
| df_insn_info_free_fields (insn_info); |
| problem_data->insn_pool->remove (insn_info); |
| DF_INSN_UID_SET (uid, NULL); |
| } |
| } |
| |
| /* Delete all of the refs information from INSN, either right now |
| or marked for later in deferred mode. */ |
| |
| void |
| df_insn_delete (rtx_insn *insn) |
| { |
| unsigned int uid; |
| basic_block bb; |
| |
| gcc_checking_assert (INSN_P (insn)); |
| |
| if (!df) |
| return; |
| |
| uid = INSN_UID (insn); |
| bb = BLOCK_FOR_INSN (insn); |
| |
| /* ??? bb can be NULL after pass_free_cfg. At that point, DF should |
| not exist anymore (as mentioned in df-core.c: "The only requirement |
| [for DF] is that there be a correct control flow graph." Clearly |
| that isn't the case after pass_free_cfg. But DF is freed much later |
| because some back-ends want to use DF info even though the CFG is |
| already gone. It's not clear to me whether that is safe, actually. |
| In any case, we expect BB to be non-NULL at least up to register |
| allocation, so disallow a non-NULL BB up to there. Not perfect |
| but better than nothing... */ |
| gcc_checking_assert (bb != NULL || reload_completed); |
| |
| df_grow_bb_info (df_scan); |
| df_grow_reg_info (); |
| |
| /* The block must be marked as dirty now, rather than later as in |
| df_insn_rescan and df_notes_rescan because it may not be there at |
| rescanning time and the mark would blow up. |
| DEBUG_INSNs do not make a block's data flow solution dirty (at |
| worst the LUIDs are no longer contiguous). */ |
| if (bb != NULL && NONDEBUG_INSN_P (insn)) |
| df_set_bb_dirty (bb); |
| |
| /* The client has deferred rescanning. */ |
| if (df->changeable_flags & DF_DEFER_INSN_RESCAN) |
| { |
| struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); |
| if (insn_info) |
| { |
| bitmap_clear_bit (&df->insns_to_rescan, uid); |
| bitmap_clear_bit (&df->insns_to_notes_rescan, uid); |
| bitmap_set_bit (&df->insns_to_delete, uid); |
| } |
| if (dump_file) |
| fprintf (dump_file, "deferring deletion of insn with uid = %d.\n", uid); |
| return; |
| } |
| |
| if (dump_file) |
| fprintf (dump_file, "deleting insn with uid = %d.\n", uid); |
| |
| df_insn_info_delete (uid); |
| } |
| |
| |
| /* Free all of the refs and the mw_hardregs in COLLECTION_REC. */ |
| |
| static void |
| df_free_collection_rec (class df_collection_rec *collection_rec) |
| { |
| unsigned int ix; |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| df_ref ref; |
| struct df_mw_hardreg *mw; |
| |
| FOR_EACH_VEC_ELT (collection_rec->def_vec, ix, ref) |
| df_free_ref (ref); |
| FOR_EACH_VEC_ELT (collection_rec->use_vec, ix, ref) |
| df_free_ref (ref); |
| FOR_EACH_VEC_ELT (collection_rec->eq_use_vec, ix, ref) |
| df_free_ref (ref); |
| FOR_EACH_VEC_ELT (collection_rec->mw_vec, ix, mw) |
| problem_data->mw_reg_pool->remove (mw); |
| |
| collection_rec->def_vec.release (); |
| collection_rec->use_vec.release (); |
| collection_rec->eq_use_vec.release (); |
| collection_rec->mw_vec.release (); |
| } |
| |
| /* Rescan INSN. Return TRUE if the rescanning produced any changes. */ |
| |
| bool |
| df_insn_rescan (rtx_insn *insn) |
| { |
| unsigned int uid = INSN_UID (insn); |
| struct df_insn_info *insn_info = NULL; |
| basic_block bb = BLOCK_FOR_INSN (insn); |
| class df_collection_rec collection_rec; |
| |
| if ((!df) || (!INSN_P (insn))) |
| return false; |
| |
| if (!bb) |
| { |
| if (dump_file) |
| fprintf (dump_file, "no bb for insn with uid = %d.\n", uid); |
| return false; |
| } |
| |
| /* The client has disabled rescanning and plans to do it itself. */ |
| if (df->changeable_flags & DF_NO_INSN_RESCAN) |
| return false; |
| |
| df_grow_bb_info (df_scan); |
| df_grow_reg_info (); |
| |
| insn_info = DF_INSN_UID_SAFE_GET (uid); |
| |
| /* The client has deferred rescanning. */ |
| if (df->changeable_flags & DF_DEFER_INSN_RESCAN) |
| { |
| if (!insn_info) |
| { |
| insn_info = df_insn_create_insn_record (insn); |
| insn_info->defs = 0; |
| insn_info->uses = 0; |
| insn_info->eq_uses = 0; |
| insn_info->mw_hardregs = 0; |
| } |
| if (dump_file) |
| fprintf (dump_file, "deferring rescan insn with uid = %d.\n", uid); |
| |
| bitmap_clear_bit (&df->insns_to_delete, uid); |
| bitmap_clear_bit (&df->insns_to_notes_rescan, uid); |
| bitmap_set_bit (&df->insns_to_rescan, INSN_UID (insn)); |
| return false; |
| } |
| |
| bitmap_clear_bit (&df->insns_to_delete, uid); |
| bitmap_clear_bit (&df->insns_to_rescan, uid); |
| bitmap_clear_bit (&df->insns_to_notes_rescan, uid); |
| if (insn_info) |
| { |
| int luid; |
| bool the_same = df_insn_refs_verify (&collection_rec, bb, insn, false); |
| /* If there's no change, return false. */ |
| if (the_same) |
| { |
| df_free_collection_rec (&collection_rec); |
| if (dump_file) |
| fprintf (dump_file, "verify found no changes in insn with uid = %d.\n", uid); |
| return false; |
| } |
| if (dump_file) |
| fprintf (dump_file, "rescanning insn with uid = %d.\n", uid); |
| |
| /* There's change - we need to delete the existing info. |
| Since the insn isn't moved, we can salvage its LUID. */ |
| luid = DF_INSN_LUID (insn); |
| df_insn_info_free_fields (insn_info); |
| df_insn_info_init_fields (insn_info, insn); |
| DF_INSN_LUID (insn) = luid; |
| } |
| else |
| { |
| struct df_insn_info *insn_info = df_insn_create_insn_record (insn); |
| df_insn_refs_collect (&collection_rec, bb, insn_info); |
| if (dump_file) |
| fprintf (dump_file, "scanning new insn with uid = %d.\n", uid); |
| } |
| |
| df_refs_add_to_chains (&collection_rec, bb, insn, copy_all); |
| if (!DEBUG_INSN_P (insn)) |
| df_set_bb_dirty (bb); |
| |
| return true; |
| } |
| |
| /* Same as df_insn_rescan, but don't mark the basic block as |
| dirty. */ |
| |
| bool |
| df_insn_rescan_debug_internal (rtx_insn *insn) |
| { |
| unsigned int uid = INSN_UID (insn); |
| struct df_insn_info *insn_info; |
| |
| gcc_assert (DEBUG_INSN_P (insn) |
| && VAR_LOC_UNKNOWN_P (INSN_VAR_LOCATION_LOC (insn))); |
| |
| if (!df) |
| return false; |
| |
| insn_info = DF_INSN_UID_SAFE_GET (INSN_UID (insn)); |
| if (!insn_info) |
| return false; |
| |
| if (dump_file) |
| fprintf (dump_file, "deleting debug_insn with uid = %d.\n", uid); |
| |
| bitmap_clear_bit (&df->insns_to_delete, uid); |
| bitmap_clear_bit (&df->insns_to_rescan, uid); |
| bitmap_clear_bit (&df->insns_to_notes_rescan, uid); |
| |
| if (insn_info->defs == 0 |
| && insn_info->uses == 0 |
| && insn_info->eq_uses == 0 |
| && insn_info->mw_hardregs == 0) |
| return false; |
| |
| df_mw_hardreg_chain_delete (insn_info->mw_hardregs); |
| |
| if (df_chain) |
| { |
| df_ref_chain_delete_du_chain (insn_info->defs); |
| df_ref_chain_delete_du_chain (insn_info->uses); |
| df_ref_chain_delete_du_chain (insn_info->eq_uses); |
| } |
| |
| df_ref_chain_delete (insn_info->defs); |
| df_ref_chain_delete (insn_info->uses); |
| df_ref_chain_delete (insn_info->eq_uses); |
| |
| insn_info->defs = 0; |
| insn_info->uses = 0; |
| insn_info->eq_uses = 0; |
| insn_info->mw_hardregs = 0; |
| |
| return true; |
| } |
| |
| |
| /* Rescan all of the insns in the function. Note that the artificial |
| uses and defs are not touched. This function will destroy def-use |
| or use-def chains. */ |
| |
| void |
| df_insn_rescan_all (void) |
| { |
| bool no_insn_rescan = false; |
| bool defer_insn_rescan = false; |
| basic_block bb; |
| bitmap_iterator bi; |
| unsigned int uid; |
| |
| if (df->changeable_flags & DF_NO_INSN_RESCAN) |
| { |
| df_clear_flags (DF_NO_INSN_RESCAN); |
| no_insn_rescan = true; |
| } |
| |
| if (df->changeable_flags & DF_DEFER_INSN_RESCAN) |
| { |
| df_clear_flags (DF_DEFER_INSN_RESCAN); |
| defer_insn_rescan = true; |
| } |
| |
| auto_bitmap tmp (&df_bitmap_obstack); |
| bitmap_copy (tmp, &df->insns_to_delete); |
| EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi) |
| { |
| struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); |
| if (insn_info) |
| df_insn_info_delete (uid); |
| } |
| |
| bitmap_clear (&df->insns_to_delete); |
| bitmap_clear (&df->insns_to_rescan); |
| bitmap_clear (&df->insns_to_notes_rescan); |
| |
| FOR_EACH_BB_FN (bb, cfun) |
| { |
| rtx_insn *insn; |
| FOR_BB_INSNS (bb, insn) |
| { |
| df_insn_rescan (insn); |
| } |
| } |
| |
| if (no_insn_rescan) |
| df_set_flags (DF_NO_INSN_RESCAN); |
| if (defer_insn_rescan) |
| df_set_flags (DF_DEFER_INSN_RESCAN); |
| } |
| |
| |
| /* Process all of the deferred rescans or deletions. */ |
| |
| void |
| df_process_deferred_rescans (void) |
| { |
| bool no_insn_rescan = false; |
| bool defer_insn_rescan = false; |
| bitmap_iterator bi; |
| unsigned int uid; |
| |
| if (df->changeable_flags & DF_NO_INSN_RESCAN) |
| { |
| df_clear_flags (DF_NO_INSN_RESCAN); |
| no_insn_rescan = true; |
| } |
| |
| if (df->changeable_flags & DF_DEFER_INSN_RESCAN) |
| { |
| df_clear_flags (DF_DEFER_INSN_RESCAN); |
| defer_insn_rescan = true; |
| } |
| |
| if (dump_file) |
| fprintf (dump_file, "starting the processing of deferred insns\n"); |
| |
| auto_bitmap tmp (&df_bitmap_obstack); |
| bitmap_copy (tmp, &df->insns_to_delete); |
| EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi) |
| { |
| struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); |
| if (insn_info) |
| df_insn_info_delete (uid); |
| } |
| |
| bitmap_copy (tmp, &df->insns_to_rescan); |
| EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi) |
| { |
| struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); |
| if (insn_info) |
| df_insn_rescan (insn_info->insn); |
| } |
| |
| bitmap_copy (tmp, &df->insns_to_notes_rescan); |
| EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi) |
| { |
| struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); |
| if (insn_info) |
| df_notes_rescan (insn_info->insn); |
| } |
| |
| if (dump_file) |
| fprintf (dump_file, "ending the processing of deferred insns\n"); |
| |
| bitmap_clear (&df->insns_to_delete); |
| bitmap_clear (&df->insns_to_rescan); |
| bitmap_clear (&df->insns_to_notes_rescan); |
| |
| if (no_insn_rescan) |
| df_set_flags (DF_NO_INSN_RESCAN); |
| if (defer_insn_rescan) |
| df_set_flags (DF_DEFER_INSN_RESCAN); |
| |
| /* If someone changed regs_ever_live during this pass, fix up the |
| entry and exit blocks. */ |
| if (df->redo_entry_and_exit) |
| { |
| df_update_entry_exit_and_calls (); |
| df->redo_entry_and_exit = false; |
| } |
| } |
| |
| |
| /* Count the number of refs. Include the defs if INCLUDE_DEFS. Include |
| the uses if INCLUDE_USES. Include the eq_uses if |
| INCLUDE_EQ_USES. */ |
| |
| static unsigned int |
| df_count_refs (bool include_defs, bool include_uses, |
| bool include_eq_uses) |
| { |
| unsigned int regno; |
| int size = 0; |
| unsigned int m = df->regs_inited; |
| |
| for (regno = 0; regno < m; regno++) |
| { |
| if (include_defs) |
| size += DF_REG_DEF_COUNT (regno); |
| if (include_uses) |
| size += DF_REG_USE_COUNT (regno); |
| if (include_eq_uses) |
| size += DF_REG_EQ_USE_COUNT (regno); |
| } |
| return size; |
| } |
| |
| |
| /* Take build ref table for either the uses or defs from the reg-use |
| or reg-def chains. This version processes the refs in reg order |
| which is likely to be best if processing the whole function. */ |
| |
| static void |
| df_reorganize_refs_by_reg_by_reg (struct df_ref_info *ref_info, |
| bool include_defs, |
| bool include_uses, |
| bool include_eq_uses) |
| { |
| unsigned int m = df->regs_inited; |
| unsigned int regno; |
| unsigned int offset = 0; |
| unsigned int start; |
| |
| if (df->changeable_flags & DF_NO_HARD_REGS) |
| { |
| start = FIRST_PSEUDO_REGISTER; |
| memset (ref_info->begin, 0, sizeof (int) * FIRST_PSEUDO_REGISTER); |
| memset (ref_info->count, 0, sizeof (int) * FIRST_PSEUDO_REGISTER); |
| } |
| else |
| start = 0; |
| |
| ref_info->total_size |
| = df_count_refs (include_defs, include_uses, include_eq_uses); |
| |
| df_check_and_grow_ref_info (ref_info, 1); |
| |
| for (regno = start; regno < m; regno++) |
| { |
| int count = 0; |
| ref_info->begin[regno] = offset; |
| if (include_defs) |
| { |
| df_ref ref = DF_REG_DEF_CHAIN (regno); |
| while (ref) |
| { |
| ref_info->refs[offset] = ref; |
| DF_REF_ID (ref) = offset++; |
| count++; |
| ref = DF_REF_NEXT_REG (ref); |
| gcc_checking_assert (offset < ref_info->refs_size); |
| } |
| } |
| if (include_uses) |
| { |
| df_ref ref = DF_REG_USE_CHAIN (regno); |
| while (ref) |
| { |
| ref_info->refs[offset] = ref; |
| DF_REF_ID (ref) = offset++; |
| count++; |
| ref = DF_REF_NEXT_REG (ref); |
| gcc_checking_assert (offset < ref_info->refs_size); |
| } |
| } |
| if (include_eq_uses) |
| { |
| df_ref ref = DF_REG_EQ_USE_CHAIN (regno); |
| while (ref) |
| { |
| ref_info->refs[offset] = ref; |
| DF_REF_ID (ref) = offset++; |
| count++; |
| ref = DF_REF_NEXT_REG (ref); |
| gcc_checking_assert (offset < ref_info->refs_size); |
| } |
| } |
| ref_info->count[regno] = count; |
| } |
| |
| /* The bitmap size is not decremented when refs are deleted. So |
| reset it now that we have squished out all of the empty |
| slots. */ |
| ref_info->table_size = offset; |
| } |
| |
| |
| /* Take build ref table for either the uses or defs from the reg-use |
| or reg-def chains. This version processes the refs in insn order |
| which is likely to be best if processing some segment of the |
| function. */ |
| |
| static void |
| df_reorganize_refs_by_reg_by_insn (struct df_ref_info *ref_info, |
| bool include_defs, |
| bool include_uses, |
| bool include_eq_uses) |
| { |
| bitmap_iterator bi; |
| unsigned int bb_index; |
| unsigned int m = df->regs_inited; |
| unsigned int offset = 0; |
| unsigned int r; |
| unsigned int start |
| = (df->changeable_flags & DF_NO_HARD_REGS) ? FIRST_PSEUDO_REGISTER : 0; |
| |
| memset (ref_info->begin, 0, sizeof (int) * df->regs_inited); |
| memset (ref_info->count, 0, sizeof (int) * df->regs_inited); |
| |
| ref_info->total_size = df_count_refs (include_defs, include_uses, include_eq_uses); |
| df_check_and_grow_ref_info (ref_info, 1); |
| |
| EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, bb_index, bi) |
| { |
| basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
| rtx_insn *insn; |
| df_ref def, use; |
| |
| if (include_defs) |
| FOR_EACH_ARTIFICIAL_DEF (def, bb_index) |
| { |
| unsigned int regno = DF_REF_REGNO (def); |
| ref_info->count[regno]++; |
| } |
| if (include_uses) |
| FOR_EACH_ARTIFICIAL_USE (use, bb_index) |
| { |
| unsigned int regno = DF_REF_REGNO (use); |
| ref_info->count[regno]++; |
| } |
| |
| FOR_BB_INSNS (bb, insn) |
| { |
| if (INSN_P (insn)) |
| { |
| struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn); |
| |
| if (include_defs) |
| FOR_EACH_INSN_INFO_DEF (def, insn_info) |
| { |
| unsigned int regno = DF_REF_REGNO (def); |
| ref_info->count[regno]++; |
| } |
| if (include_uses) |
| FOR_EACH_INSN_INFO_USE (use, insn_info) |
| { |
| unsigned int regno = DF_REF_REGNO (use); |
| ref_info->count[regno]++; |
| } |
| if (include_eq_uses) |
| FOR_EACH_INSN_INFO_EQ_USE (use, insn_info) |
| { |
| unsigned int regno = DF_REF_REGNO (use); |
| ref_info->count[regno]++; |
| } |
| } |
| } |
| } |
| |
| for (r = start; r < m; r++) |
| { |
| ref_info->begin[r] = offset; |
| offset += ref_info->count[r]; |
| ref_info->count[r] = 0; |
| } |
| |
| EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, bb_index, bi) |
| { |
| basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
| rtx_insn *insn; |
| df_ref def, use; |
| |
| if (include_defs) |
| FOR_EACH_ARTIFICIAL_DEF (def, bb_index) |
| { |
| unsigned int regno = DF_REF_REGNO (def); |
| if (regno >= start) |
| { |
| unsigned int id |
| = ref_info->begin[regno] + ref_info->count[regno]++; |
| DF_REF_ID (def) = id; |
| ref_info->refs[id] = def; |
| } |
| } |
| if (include_uses) |
| FOR_EACH_ARTIFICIAL_USE (use, bb_index) |
| { |
| unsigned int regno = DF_REF_REGNO (def); |
| if (regno >= start) |
| { |
| unsigned int id |
| = ref_info->begin[regno] + ref_info->count[regno]++; |
| DF_REF_ID (use) = id; |
| ref_info->refs[id] = use; |
| } |
| } |
| |
| FOR_BB_INSNS (bb, insn) |
| { |
| if (INSN_P (insn)) |
| { |
| struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn); |
| |
| if (include_defs) |
| FOR_EACH_INSN_INFO_DEF (def, insn_info) |
| { |
| unsigned int regno = DF_REF_REGNO (def); |
| if (regno >= start) |
| { |
| unsigned int id |
| = ref_info->begin[regno] + ref_info->count[regno]++; |
| DF_REF_ID (def) = id; |
| ref_info->refs[id] = def; |
| } |
| } |
| if (include_uses) |
| FOR_EACH_INSN_INFO_USE (use, insn_info) |
| { |
| unsigned int regno = DF_REF_REGNO (use); |
| if (regno >= start) |
| { |
| unsigned int id |
| = ref_info->begin[regno] + ref_info->count[regno]++; |
| DF_REF_ID (use) = id; |
| ref_info->refs[id] = use; |
| } |
| } |
| if (include_eq_uses) |
| FOR_EACH_INSN_INFO_EQ_USE (use, insn_info) |
| { |
| unsigned int regno = DF_REF_REGNO (use); |
| if (regno >= start) |
| { |
| unsigned int id |
| = ref_info->begin[regno] + ref_info->count[regno]++; |
| DF_REF_ID (use) = id; |
| ref_info->refs[id] = use; |
| } |
| } |
| } |
| } |
| } |
| |
| /* The bitmap size is not decremented when refs are deleted. So |
| reset it now that we have squished out all of the empty |
| slots. */ |
| |
| ref_info->table_size = offset; |
| } |
| |
| /* Take build ref table for either the uses or defs from the reg-use |
| or reg-def chains. */ |
| |
| static void |
| df_reorganize_refs_by_reg (struct df_ref_info *ref_info, |
| bool include_defs, |
| bool include_uses, |
| bool include_eq_uses) |
| { |
| if (df->analyze_subset) |
| df_reorganize_refs_by_reg_by_insn (ref_info, include_defs, |
| include_uses, include_eq_uses); |
| else |
| df_reorganize_refs_by_reg_by_reg (ref_info, include_defs, |
| include_uses, include_eq_uses); |
| } |
| |
| |
| /* Add the refs in REF_VEC to the table in REF_INFO starting at OFFSET. */ |
| static unsigned int |
| df_add_refs_to_table (unsigned int offset, |
| struct df_ref_info *ref_info, |
| df_ref ref) |
| { |
| for (; ref; ref = DF_REF_NEXT_LOC (ref)) |
| if (!(df->changeable_flags & DF_NO_HARD_REGS) |
| || (DF_REF_REGNO (ref) >= FIRST_PSEUDO_REGISTER)) |
| { |
| ref_info->refs[offset] = ref; |
| DF_REF_ID (ref) = offset++; |
| } |
| return offset; |
| } |
| |
| |
| /* Count the number of refs in all of the insns of BB. Include the |
| defs if INCLUDE_DEFS. Include the uses if INCLUDE_USES. Include the |
| eq_uses if INCLUDE_EQ_USES. */ |
| |
| static unsigned int |
| df_reorganize_refs_by_insn_bb (basic_block bb, unsigned int offset, |
| struct df_ref_info *ref_info, |
| bool include_defs, bool include_uses, |
| bool include_eq_uses) |
| { |
| rtx_insn *insn; |
| |
| if (include_defs) |
| offset = df_add_refs_to_table (offset, ref_info, |
| df_get_artificial_defs (bb->index)); |
| if (include_uses) |
| offset = df_add_refs_to_table (offset, ref_info, |
| df_get_artificial_uses (bb->index)); |
| |
| FOR_BB_INSNS (bb, insn) |
| if (INSN_P (insn)) |
| { |
| unsigned int uid = INSN_UID (insn); |
| if (include_defs) |
| offset = df_add_refs_to_table (offset, ref_info, |
| DF_INSN_UID_DEFS (uid)); |
| if (include_uses) |
| offset = df_add_refs_to_table (offset, ref_info, |
| DF_INSN_UID_USES (uid)); |
| if (include_eq_uses) |
| offset = df_add_refs_to_table (offset, ref_info, |
| DF_INSN_UID_EQ_USES (uid)); |
| } |
| return offset; |
| } |
| |
| |
| /* Organize the refs by insn into the table in REF_INFO. If |
| blocks_to_analyze is defined, use that set, otherwise the entire |
| program. Include the defs if INCLUDE_DEFS. Include the uses if |
| INCLUDE_USES. Include the eq_uses if INCLUDE_EQ_USES. */ |
| |
| static void |
| df_reorganize_refs_by_insn (struct df_ref_info *ref_info, |
| bool include_defs, bool include_uses, |
| bool include_eq_uses) |
| { |
| basic_block bb; |
| unsigned int offset = 0; |
| |
| ref_info->total_size = df_count_refs (include_defs, include_uses, include_eq_uses); |
| df_check_and_grow_ref_info (ref_info, 1); |
| if (df->blocks_to_analyze) |
| { |
| bitmap_iterator bi; |
| unsigned int index; |
| |
| EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, index, bi) |
| { |
| offset = df_reorganize_refs_by_insn_bb (BASIC_BLOCK_FOR_FN (cfun, |
| index), |
| offset, ref_info, |
| include_defs, include_uses, |
| include_eq_uses); |
| } |
| |
| ref_info->table_size = offset; |
| } |
| else |
| { |
| FOR_ALL_BB_FN (bb, cfun) |
| offset = df_reorganize_refs_by_insn_bb (bb, offset, ref_info, |
| include_defs, include_uses, |
| include_eq_uses); |
| ref_info->table_size = offset; |
| } |
| } |
| |
| |
| /* If the use refs in DF are not organized, reorganize them. */ |
| |
| void |
| df_maybe_reorganize_use_refs (enum df_ref_order order) |
| { |
| if (order == df->use_info.ref_order) |
| return; |
| |
| switch (order) |
| { |
| case DF_REF_ORDER_BY_REG: |
| df_reorganize_refs_by_reg (&df->use_info, false, true, false); |
| break; |
| |
| case DF_REF_ORDER_BY_REG_WITH_NOTES: |
| df_reorganize_refs_by_reg (&df->use_info, false, true, true); |
| break; |
| |
| case DF_REF_ORDER_BY_INSN: |
| df_reorganize_refs_by_insn (&df->use_info, false, true, false); |
| break; |
| |
| case DF_REF_ORDER_BY_INSN_WITH_NOTES: |
| df_reorganize_refs_by_insn (&df->use_info, false, true, true); |
| break; |
| |
| case DF_REF_ORDER_NO_TABLE: |
| free (df->use_info.refs); |
| df->use_info.refs = NULL; |
| df->use_info.refs_size = 0; |
| break; |
| |
| case DF_REF_ORDER_UNORDERED: |
| case DF_REF_ORDER_UNORDERED_WITH_NOTES: |
| gcc_unreachable (); |
| break; |
| } |
| |
| df->use_info.ref_order = order; |
| } |
| |
| |
| /* If the def refs in DF are not organized, reorganize them. */ |
| |
| void |
| df_maybe_reorganize_def_refs (enum df_ref_order order) |
| { |
| if (order == df->def_info.ref_order) |
| return; |
| |
| switch (order) |
| { |
| case DF_REF_ORDER_BY_REG: |
| df_reorganize_refs_by_reg (&df->def_info, true, false, false); |
| break; |
| |
| case DF_REF_ORDER_BY_INSN: |
| df_reorganize_refs_by_insn (&df->def_info, true, false, false); |
| break; |
| |
| case DF_REF_ORDER_NO_TABLE: |
| free (df->def_info.refs); |
| df->def_info.refs = NULL; |
| df->def_info.refs_size = 0; |
| break; |
| |
| case DF_REF_ORDER_BY_INSN_WITH_NOTES: |
| case DF_REF_ORDER_BY_REG_WITH_NOTES: |
| case DF_REF_ORDER_UNORDERED: |
| case DF_REF_ORDER_UNORDERED_WITH_NOTES: |
| gcc_unreachable (); |
| break; |
| } |
| |
| df->def_info.ref_order = order; |
| } |
| |
| |
| /* Change all of the basic block references in INSN to use the insn's |
| current basic block. This function is called from routines that move |
| instructions from one block to another. */ |
| |
| void |
| df_insn_change_bb (rtx_insn *insn, basic_block new_bb) |
| { |
| basic_block old_bb = BLOCK_FOR_INSN (insn); |
| struct df_insn_info *insn_info; |
| unsigned int uid = INSN_UID (insn); |
| |
| if (old_bb == new_bb) |
| return; |
| |
| set_block_for_insn (insn, new_bb); |
| |
| if (!df) |
| return; |
| |
| if (dump_file) |
| fprintf (dump_file, "changing bb of uid %d\n", uid); |
| |
| insn_info = DF_INSN_UID_SAFE_GET (uid); |
| if (insn_info == NULL) |
| { |
| if (dump_file) |
| fprintf (dump_file, " unscanned insn\n"); |
| df_insn_rescan (insn); |
| return; |
| } |
| |
| if (!INSN_P (insn)) |
| return; |
| |
| df_set_bb_dirty (new_bb); |
| if (old_bb) |
| { |
| if (dump_file) |
| fprintf (dump_file, " from %d to %d\n", |
| old_bb->index, new_bb->index); |
| df_set_bb_dirty (old_bb); |
| } |
| else |
| if (dump_file) |
| fprintf (dump_file, " to %d\n", new_bb->index); |
| } |
| |
| |
| /* Helper function for df_ref_change_reg_with_loc. */ |
| |
| static void |
| df_ref_change_reg_with_loc_1 (struct df_reg_info *old_df, |
| struct df_reg_info *new_df, |
| unsigned int new_regno, rtx loc) |
| { |
| df_ref the_ref = old_df->reg_chain; |
| |
| while (the_ref) |
| { |
| if ((!DF_REF_IS_ARTIFICIAL (the_ref)) |
| && DF_REF_LOC (the_ref) |
| && (*DF_REF_LOC (the_ref) == loc)) |
| { |
| df_ref next_ref = DF_REF_NEXT_REG (the_ref); |
| df_ref prev_ref = DF_REF_PREV_REG (the_ref); |
| df_ref *ref_ptr; |
| struct df_insn_info *insn_info = DF_REF_INSN_INFO (the_ref); |
| |
| DF_REF_REGNO (the_ref) = new_regno; |
| DF_REF_REG (the_ref) = regno_reg_rtx[new_regno]; |
| |
| /* Pull the_ref out of the old regno chain. */ |
| if (prev_ref) |
| DF_REF_NEXT_REG (prev_ref) = next_ref; |
| else |
| old_df->reg_chain = next_ref; |
| if (next_ref) |
| DF_REF_PREV_REG (next_ref) = prev_ref; |
| old_df->n_refs--; |
| |
| /* Put the ref into the new regno chain. */ |
| DF_REF_PREV_REG (the_ref) = NULL; |
| DF_REF_NEXT_REG (the_ref) = new_df->reg_chain; |
| if (new_df->reg_chain) |
| DF_REF_PREV_REG (new_df->reg_chain) = the_ref; |
| new_df->reg_chain = the_ref; |
| new_df->n_refs++; |
| if (DF_REF_BB (the_ref)) |
| df_set_bb_dirty (DF_REF_BB (the_ref)); |
| |
| /* Need to sort the record again that the ref was in because |
| the regno is a sorting key. First, find the right |
| record. */ |
| if (DF_REF_REG_DEF_P (the_ref)) |
| ref_ptr = &insn_info->defs; |
| else if (DF_REF_FLAGS (the_ref) & DF_REF_IN_NOTE) |
| ref_ptr = &insn_info->eq_uses; |
| else |
| ref_ptr = &insn_info->uses; |
| if (dump_file) |
| fprintf (dump_file, "changing reg in insn %d\n", |
| DF_REF_INSN_UID (the_ref)); |
| |
| /* Stop if we find the current reference or where the reference |
| needs to be. */ |
| while (*ref_ptr != the_ref && df_ref_compare (*ref_ptr, the_ref) < 0) |
| ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr); |
| if (*ref_ptr != the_ref) |
| { |
| /* The reference needs to be promoted up the list. */ |
| df_ref next = DF_REF_NEXT_LOC (the_ref); |
| DF_REF_NEXT_LOC (the_ref) = *ref_ptr; |
| *ref_ptr = the_ref; |
| do |
| ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr); |
| while (*ref_ptr != the_ref); |
| *ref_ptr = next; |
| } |
| else if (DF_REF_NEXT_LOC (the_ref) |
| && df_ref_compare (the_ref, DF_REF_NEXT_LOC (the_ref)) > 0) |
| { |
| /* The reference needs to be demoted down the list. */ |
| *ref_ptr = DF_REF_NEXT_LOC (the_ref); |
| do |
| ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr); |
| while (*ref_ptr && df_ref_compare (the_ref, *ref_ptr) > 0); |
| DF_REF_NEXT_LOC (the_ref) = *ref_ptr; |
| *ref_ptr = the_ref; |
| } |
| |
| the_ref = next_ref; |
| } |
| else |
| the_ref = DF_REF_NEXT_REG (the_ref); |
| } |
| } |
| |
| |
| /* Change the regno of register LOC to NEW_REGNO and update the df |
| information accordingly. Refs that do not match LOC are not changed |
| which means that artificial refs are not changed since they have no loc. |
| This call is to support the SET_REGNO macro. */ |
| |
| void |
| df_ref_change_reg_with_loc (rtx loc, unsigned int new_regno) |
| { |
| unsigned int old_regno = REGNO (loc); |
| if (old_regno == new_regno) |
| return; |
| |
| if (df) |
| { |
| df_grow_reg_info (); |
| |
| df_ref_change_reg_with_loc_1 (DF_REG_DEF_GET (old_regno), |
| DF_REG_DEF_GET (new_regno), |
| new_regno, loc); |
| df_ref_change_reg_with_loc_1 (DF_REG_USE_GET (old_regno), |
| DF_REG_USE_GET (new_regno), |
| new_regno, loc); |
| df_ref_change_reg_with_loc_1 (DF_REG_EQ_USE_GET (old_regno), |
| DF_REG_EQ_USE_GET (new_regno), |
| new_regno, loc); |
| } |
| set_mode_and_regno (loc, GET_MODE (loc), new_regno); |
| } |
| |
| |
| /* Delete the mw_hardregs that point into the eq_notes. */ |
| |
| static void |
| df_mw_hardreg_chain_delete_eq_uses (struct df_insn_info *insn_info) |
| { |
| struct df_mw_hardreg **mw_ptr = &insn_info->mw_hardregs; |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| |
| while (*mw_ptr) |
| { |
| df_mw_hardreg *mw = *mw_ptr; |
| if (mw->flags & DF_REF_IN_NOTE) |
| { |
| *mw_ptr = DF_MWS_NEXT (mw); |
| problem_data->mw_reg_pool->remove (mw); |
| } |
| else |
| mw_ptr = &DF_MWS_NEXT (mw); |
| } |
| } |
| |
| |
| /* Rescan only the REG_EQUIV/REG_EQUAL notes part of INSN. */ |
| |
| void |
| df_notes_rescan (rtx_insn *insn) |
| { |
| struct df_insn_info *insn_info; |
| unsigned int uid = INSN_UID (insn); |
| |
| if (!df) |
| return; |
| |
| /* The client has disabled rescanning and plans to do it itself. */ |
| if (df->changeable_flags & DF_NO_INSN_RESCAN) |
| return; |
| |
| /* Do nothing if the insn hasn't been emitted yet. */ |
| if (!BLOCK_FOR_INSN (insn)) |
| return; |
| |
| df_grow_bb_info (df_scan); |
| df_grow_reg_info (); |
| |
| insn_info = DF_INSN_UID_SAFE_GET (INSN_UID (insn)); |
| |
| /* The client has deferred rescanning. */ |
| if (df->changeable_flags & DF_DEFER_INSN_RESCAN) |
| { |
| if (!insn_info) |
| { |
| insn_info = df_insn_create_insn_record (insn); |
| insn_info->defs = 0; |
| insn_info->uses = 0; |
| insn_info->eq_uses = 0; |
| insn_info->mw_hardregs = 0; |
| } |
| |
| bitmap_clear_bit (&df->insns_to_delete, uid); |
| /* If the insn is set to be rescanned, it does not need to also |
| be notes rescanned. */ |
| if (!bitmap_bit_p (&df->insns_to_rescan, uid)) |
| bitmap_set_bit (&df->insns_to_notes_rescan, INSN_UID (insn)); |
| return; |
| } |
| |
| bitmap_clear_bit (&df->insns_to_delete, uid); |
| bitmap_clear_bit (&df->insns_to_notes_rescan, uid); |
| |
| if (insn_info) |
| { |
| basic_block bb = BLOCK_FOR_INSN (insn); |
| rtx note; |
| class df_collection_rec collection_rec; |
| unsigned int i; |
| |
| df_mw_hardreg_chain_delete_eq_uses (insn_info); |
| df_ref_chain_delete (insn_info->eq_uses); |
| insn_info->eq_uses = NULL; |
| |
| /* Process REG_EQUIV/REG_EQUAL notes */ |
| for (note = REG_NOTES (insn); note; |
| note = XEXP (note, 1)) |
| { |
| switch (REG_NOTE_KIND (note)) |
| { |
| case REG_EQUIV: |
| case REG_EQUAL: |
| df_uses_record (&collection_rec, |
| &XEXP (note, 0), DF_REF_REG_USE, |
| bb, insn_info, DF_REF_IN_NOTE); |
| default: |
| break; |
| } |
| } |
| |
| /* Find some place to put any new mw_hardregs. */ |
| df_canonize_collection_rec (&collection_rec); |
| struct df_mw_hardreg **mw_ptr = &insn_info->mw_hardregs, *mw; |
| FOR_EACH_VEC_ELT (collection_rec.mw_vec, i, mw) |
| { |
| while (*mw_ptr && df_mw_compare (*mw_ptr, mw) < 0) |
| mw_ptr = &DF_MWS_NEXT (*mw_ptr); |
| DF_MWS_NEXT (mw) = *mw_ptr; |
| *mw_ptr = mw; |
| mw_ptr = &DF_MWS_NEXT (mw); |
| } |
| df_refs_add_to_chains (&collection_rec, bb, insn, copy_eq_uses); |
| } |
| else |
| df_insn_rescan (insn); |
| |
| } |
| |
| |
| /*---------------------------------------------------------------------------- |
| Hard core instruction scanning code. No external interfaces here, |
| just a lot of routines that look inside insns. |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /* Return true if the contents of two df_ref's are identical. |
| It ignores DF_REF_MARKER. */ |
| |
| static bool |
| df_ref_equal_p (df_ref ref1, df_ref ref2) |
| { |
| if (!ref2) |
| return false; |
| |
| if (ref1 == ref2) |
| return true; |
| |
| if (DF_REF_CLASS (ref1) != DF_REF_CLASS (ref2) |
| || DF_REF_REGNO (ref1) != DF_REF_REGNO (ref2) |
| || DF_REF_REG (ref1) != DF_REF_REG (ref2) |
| || DF_REF_TYPE (ref1) != DF_REF_TYPE (ref2) |
| || ((DF_REF_FLAGS (ref1) & ~(DF_REF_REG_MARKER + DF_REF_MW_HARDREG)) |
| != (DF_REF_FLAGS (ref2) & ~(DF_REF_REG_MARKER + DF_REF_MW_HARDREG))) |
| || DF_REF_BB (ref1) != DF_REF_BB (ref2) |
| || DF_REF_INSN_INFO (ref1) != DF_REF_INSN_INFO (ref2)) |
| return false; |
| |
| switch (DF_REF_CLASS (ref1)) |
| { |
| case DF_REF_ARTIFICIAL: |
| case DF_REF_BASE: |
| return true; |
| |
| case DF_REF_REGULAR: |
| return DF_REF_LOC (ref1) == DF_REF_LOC (ref2); |
| |
| default: |
| gcc_unreachable (); |
| } |
| return false; |
| } |
| |
| |
| /* Compare REF1 and REF2 for sorting. This is only called from places |
| where all of the refs are of the same type, in the same insn, and |
| have the same bb. So these fields are not checked. */ |
| |
| static int |
| df_ref_compare (df_ref ref1, df_ref ref2) |
| { |
| if (DF_REF_CLASS (ref1) != DF_REF_CLASS (ref2)) |
| return (int)DF_REF_CLASS (ref1) - (int)DF_REF_CLASS (ref2); |
| |
| if (DF_REF_REGNO (ref1) != DF_REF_REGNO (ref2)) |
| return (int)DF_REF_REGNO (ref1) - (int)DF_REF_REGNO (ref2); |
| |
| if (DF_REF_TYPE (ref1) != DF_REF_TYPE (ref2)) |
| return (int)DF_REF_TYPE (ref1) - (int)DF_REF_TYPE (ref2); |
| |
| if (DF_REF_REG (ref1) != DF_REF_REG (ref2)) |
| return (int)DF_REF_ORDER (ref1) - (int)DF_REF_ORDER (ref2); |
| |
| /* Cannot look at the LOC field on artificial refs. */ |
| if (DF_REF_CLASS (ref1) != DF_REF_ARTIFICIAL |
| && DF_REF_LOC (ref1) != DF_REF_LOC (ref2)) |
| return (int)DF_REF_ORDER (ref1) - (int)DF_REF_ORDER (ref2); |
| |
| if (DF_REF_FLAGS (ref1) != DF_REF_FLAGS (ref2)) |
| { |
| /* If two refs are identical except that one of them has is from |
| a mw and one is not, we need to have the one with the mw |
| first. */ |
| if (DF_REF_FLAGS_IS_SET (ref1, DF_REF_MW_HARDREG) == |
| DF_REF_FLAGS_IS_SET (ref2, DF_REF_MW_HARDREG)) |
| return DF_REF_FLAGS (ref1) - DF_REF_FLAGS (ref2); |
| else if (DF_REF_FLAGS_IS_SET (ref1, DF_REF_MW_HARDREG)) |
| return -1; |
| else |
| return 1; |
| } |
| |
| return (int)DF_REF_ORDER (ref1) - (int)DF_REF_ORDER (ref2); |
| } |
| |
| /* Like df_ref_compare, but compare two df_ref* pointers R1 and R2. */ |
| |
| static int |
| df_ref_ptr_compare (const void *r1, const void *r2) |
| { |
| return df_ref_compare (*(const df_ref *) r1, *(const df_ref *) r2); |
| } |
| |
| /* Sort and compress a set of refs. */ |
| |
| static void |
| df_sort_and_compress_refs (vec<df_ref, va_heap> *ref_vec) |
| { |
| unsigned int count; |
| unsigned int i; |
| unsigned int dist = 0; |
| |
| count = ref_vec->length (); |
| |
| /* If there are 1 or 0 elements, there is nothing to do. */ |
| if (count < 2) |
| return; |
| else if (count == 2) |
| { |
| df_ref r0 = (*ref_vec)[0]; |
| df_ref r1 = (*ref_vec)[1]; |
| if (df_ref_compare (r0, r1) > 0) |
| std::swap ((*ref_vec)[0], (*ref_vec)[1]); |
| } |
| else |
| { |
| for (i = 0; i < count - 1; i++) |
| { |
| df_ref r0 = (*ref_vec)[i]; |
| df_ref r1 = (*ref_vec)[i + 1]; |
| if (df_ref_compare (r0, r1) >= 0) |
| break; |
| } |
| /* If the array is already strictly ordered, |
| which is the most common case for large COUNT case |
| (which happens for CALL INSNs), |
| no need to sort and filter out duplicate. |
| Simply return the count. |
| Make sure DF_GET_ADD_REFS adds refs in the increasing order |
| of DF_REF_COMPARE. */ |
| if (i == count - 1) |
| return; |
| ref_vec->qsort (df_ref_ptr_compare); |
| } |
| |
| for (i=0; i<count-dist; i++) |
| { |
| /* Find the next ref that is not equal to the current ref. */ |
| while (i + dist + 1 < count |
| && df_ref_equal_p ((*ref_vec)[i], |
| (*ref_vec)[i + dist + 1])) |
| { |
| df_free_ref ((*ref_vec)[i + dist + 1]); |
| dist++; |
| } |
| /* Copy it down to the next position. */ |
| if (dist && i + dist + 1 < count) |
| (*ref_vec)[i + 1] = (*ref_vec)[i + dist + 1]; |
| } |
| |
| count -= dist; |
| ref_vec->truncate (count); |
| } |
| |
| |
| /* Return true if the contents of two df_ref's are identical. |
| It ignores DF_REF_MARKER. */ |
| |
| static bool |
| df_mw_equal_p (struct df_mw_hardreg *mw1, struct df_mw_hardreg *mw2) |
| { |
| if (!mw2) |
| return false; |
| return (mw1 == mw2) || |
| (mw1->mw_reg == mw2->mw_reg |
| && mw1->type == mw2->type |
| && mw1->flags == mw2->flags |
| && mw1->start_regno == mw2->start_regno |
| && mw1->end_regno == mw2->end_regno); |
| } |
| |
| |
| /* Compare MW1 and MW2 for sorting. */ |
| |
| static int |
| df_mw_compare (const df_mw_hardreg *mw1, const df_mw_hardreg *mw2) |
| { |
| if (mw1->type != mw2->type) |
| return mw1->type - mw2->type; |
| |
| if (mw1->flags != mw2->flags) |
| return mw1->flags - mw2->flags; |
| |
| if (mw1->start_regno != mw2->start_regno) |
| return mw1->start_regno - mw2->start_regno; |
| |
| if (mw1->end_regno != mw2->end_regno) |
| return mw1->end_regno - mw2->end_regno; |
| |
| return mw1->mw_order - mw2->mw_order; |
| } |
| |
| /* Like df_mw_compare, but compare two df_mw_hardreg** pointers R1 and R2. */ |
| |
| static int |
| df_mw_ptr_compare (const void *m1, const void *m2) |
| { |
| return df_mw_compare (*(const df_mw_hardreg *const *) m1, |
| *(const df_mw_hardreg *const *) m2); |
| } |
| |
| /* Sort and compress a set of refs. */ |
| |
| static void |
| df_sort_and_compress_mws (vec<df_mw_hardreg *, va_heap> *mw_vec) |
| { |
| unsigned int count; |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| unsigned int i; |
| unsigned int dist = 0; |
| |
| count = mw_vec->length (); |
| if (count < 2) |
| return; |
| else if (count == 2) |
| { |
| struct df_mw_hardreg *m0 = (*mw_vec)[0]; |
| struct df_mw_hardreg *m1 = (*mw_vec)[1]; |
| if (df_mw_compare (m0, m1) > 0) |
| { |
| struct df_mw_hardreg *tmp = (*mw_vec)[0]; |
| (*mw_vec)[0] = (*mw_vec)[1]; |
| (*mw_vec)[1] = tmp; |
| } |
| } |
| else |
| mw_vec->qsort (df_mw_ptr_compare); |
| |
| for (i=0; i<count-dist; i++) |
| { |
| /* Find the next ref that is not equal to the current ref. */ |
| while (i + dist + 1 < count |
| && df_mw_equal_p ((*mw_vec)[i], (*mw_vec)[i + dist + 1])) |
| { |
| problem_data->mw_reg_pool->remove ((*mw_vec)[i + dist + 1]); |
| dist++; |
| } |
| /* Copy it down to the next position. */ |
| if (dist && i + dist + 1 < count) |
| (*mw_vec)[i + 1] = (*mw_vec)[i + dist + 1]; |
| } |
| |
| count -= dist; |
| mw_vec->truncate (count); |
| } |
| |
| |
| /* Sort and remove duplicates from the COLLECTION_REC. */ |
| |
| static void |
| df_canonize_collection_rec (class df_collection_rec *collection_rec) |
| { |
| df_sort_and_compress_refs (&collection_rec->def_vec); |
| df_sort_and_compress_refs (&collection_rec->use_vec); |
| df_sort_and_compress_refs (&collection_rec->eq_use_vec); |
| df_sort_and_compress_mws (&collection_rec->mw_vec); |
| } |
| |
| |
| /* Add the new df_ref to appropriate reg_info/ref_info chains. */ |
| |
| static void |
| df_install_ref (df_ref this_ref, |
| struct df_reg_info *reg_info, |
| struct df_ref_info *ref_info, |
| bool add_to_table) |
| { |
| unsigned int regno = DF_REF_REGNO (this_ref); |
| /* Add the ref to the reg_{def,use,eq_use} chain. */ |
| df_ref head = reg_info->reg_chain; |
| |
| reg_info->reg_chain = this_ref; |
| reg_info->n_refs++; |
| |
| if (DF_REF_FLAGS_IS_SET (this_ref, DF_HARD_REG_LIVE)) |
| { |
| gcc_assert (regno < FIRST_PSEUDO_REGISTER); |
| df->hard_regs_live_count[regno]++; |
| } |
| |
| gcc_checking_assert (DF_REF_NEXT_REG (this_ref) == NULL |
| && DF_REF_PREV_REG (this_ref) == NULL); |
| |
| DF_REF_NEXT_REG (this_ref) = head; |
| |
| /* We cannot actually link to the head of the chain. */ |
| DF_REF_PREV_REG (this_ref) = NULL; |
| |
| if (head) |
| DF_REF_PREV_REG (head) = this_ref; |
| |
| if (add_to_table) |
| { |
| gcc_assert (ref_info->ref_order != DF_REF_ORDER_NO_TABLE); |
| df_check_and_grow_ref_info (ref_info, 1); |
| DF_REF_ID (this_ref) = ref_info->table_size; |
| /* Add the ref to the big array of defs. */ |
| ref_info->refs[ref_info->table_size] = this_ref; |
| ref_info->table_size++; |
| } |
| else |
| DF_REF_ID (this_ref) = -1; |
| |
| ref_info->total_size++; |
| } |
| |
| |
| /* This function takes one of the groups of refs (defs, uses or |
| eq_uses) and installs the entire group into the insn. It also adds |
| each of these refs into the appropriate chains. */ |
| |
| static df_ref |
| df_install_refs (basic_block bb, |
| const vec<df_ref, va_heap> *old_vec, |
| struct df_reg_info **reg_info, |
| struct df_ref_info *ref_info, |
| bool is_notes) |
| { |
| unsigned int count = old_vec->length (); |
| if (count) |
| { |
| bool add_to_table; |
| df_ref this_ref; |
| unsigned int ix; |
| |
| switch (ref_info->ref_order) |
| { |
| case DF_REF_ORDER_UNORDERED_WITH_NOTES: |
| case DF_REF_ORDER_BY_REG_WITH_NOTES: |
| case DF_REF_ORDER_BY_INSN_WITH_NOTES: |
| ref_info->ref_order = DF_REF_ORDER_UNORDERED_WITH_NOTES; |
| add_to_table = true; |
| break; |
| case DF_REF_ORDER_UNORDERED: |
| case DF_REF_ORDER_BY_REG: |
| case DF_REF_ORDER_BY_INSN: |
| ref_info->ref_order = DF_REF_ORDER_UNORDERED; |
| add_to_table = !is_notes; |
| break; |
| default: |
| add_to_table = false; |
| break; |
| } |
| |
| /* Do not add if ref is not in the right blocks. */ |
| if (add_to_table && df->analyze_subset) |
| add_to_table = bitmap_bit_p (df->blocks_to_analyze, bb->index); |
| |
| FOR_EACH_VEC_ELT (*old_vec, ix, this_ref) |
| { |
| DF_REF_NEXT_LOC (this_ref) = (ix + 1 < old_vec->length () |
| ? (*old_vec)[ix + 1] |
| : NULL); |
| df_install_ref (this_ref, reg_info[DF_REF_REGNO (this_ref)], |
| ref_info, add_to_table); |
| } |
| return (*old_vec)[0]; |
| } |
| else |
| return 0; |
| } |
| |
| |
| /* This function takes the mws installs the entire group into the |
| insn. */ |
| |
| static struct df_mw_hardreg * |
| df_install_mws (const vec<df_mw_hardreg *, va_heap> *old_vec) |
| { |
| unsigned int count = old_vec->length (); |
| if (count) |
| { |
| for (unsigned int i = 0; i < count - 1; i++) |
| DF_MWS_NEXT ((*old_vec)[i]) = (*old_vec)[i + 1]; |
| DF_MWS_NEXT ((*old_vec)[count - 1]) = 0; |
| return (*old_vec)[0]; |
| } |
| else |
| return 0; |
| } |
| |
| |
| /* Add a chain of df_refs to appropriate ref chain/reg_info/ref_info |
| chains and update other necessary information. */ |
| |
| static void |
| df_refs_add_to_chains (class df_collection_rec *collection_rec, |
| basic_block bb, rtx_insn *insn, unsigned int flags) |
| { |
| if (insn) |
| { |
| struct df_insn_info *insn_rec = DF_INSN_INFO_GET (insn); |
| /* If there is a vector in the collection rec, add it to the |
| insn. A null rec is a signal that the caller will handle the |
| chain specially. */ |
| if (flags & copy_defs) |
| { |
| gcc_checking_assert (!insn_rec->defs); |
| insn_rec->defs |
| = df_install_refs (bb, &collection_rec->def_vec, |
| df->def_regs, |
| &df->def_info, false); |
| } |
| if (flags & copy_uses) |
| { |
| gcc_checking_assert (!insn_rec->uses); |
| insn_rec->uses |
| = df_install_refs (bb, &collection_rec->use_vec, |
| df->use_regs, |
| &df->use_info, false); |
| } |
| if (flags & copy_eq_uses) |
| { |
| gcc_checking_assert (!insn_rec->eq_uses); |
| insn_rec->eq_uses |
| = df_install_refs (bb, &collection_rec->eq_use_vec, |
| df->eq_use_regs, |
| &df->use_info, true); |
| } |
| if (flags & copy_mw) |
| { |
| gcc_checking_assert (!insn_rec->mw_hardregs); |
| insn_rec->mw_hardregs |
| = df_install_mws (&collection_rec->mw_vec); |
| } |
| } |
| else |
| { |
| struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb->index); |
| |
| gcc_checking_assert (!bb_info->artificial_defs); |
| bb_info->artificial_defs |
| = df_install_refs (bb, &collection_rec->def_vec, |
| df->def_regs, |
| &df->def_info, false); |
| gcc_checking_assert (!bb_info->artificial_uses); |
| bb_info->artificial_uses |
| = df_install_refs (bb, &collection_rec->use_vec, |
| df->use_regs, |
| &df->use_info, false); |
| } |
| } |
| |
| |
| /* Allocate a ref and initialize its fields. */ |
| |
| static df_ref |
| df_ref_create_structure (enum df_ref_class cl, |
| class df_collection_rec *collection_rec, |
| rtx reg, rtx *loc, |
| basic_block bb, struct df_insn_info *info, |
| enum df_ref_type ref_type, |
| int ref_flags) |
| { |
| df_ref this_ref = NULL; |
| unsigned int regno = REGNO (GET_CODE (reg) == SUBREG ? SUBREG_REG (reg) : reg); |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| |
| switch (cl) |
| { |
| case DF_REF_BASE: |
| this_ref = (df_ref) (problem_data->ref_base_pool->allocate ()); |
| gcc_checking_assert (loc == NULL); |
| break; |
| |
| case DF_REF_ARTIFICIAL: |
| this_ref = (df_ref) (problem_data->ref_artificial_pool->allocate ()); |
| this_ref->artificial_ref.bb = bb; |
| gcc_checking_assert (loc == NULL); |
| break; |
| |
| case DF_REF_REGULAR: |
| this_ref = (df_ref) (problem_data->ref_regular_pool->allocate ()); |
| this_ref->regular_ref.loc = loc; |
| gcc_checking_assert (loc); |
| break; |
| } |
| |
| DF_REF_CLASS (this_ref) = cl; |
| DF_REF_ID (this_ref) = -1; |
| DF_REF_REG (this_ref) = reg; |
| DF_REF_REGNO (this_ref) = regno; |
| DF_REF_TYPE (this_ref) = ref_type; |
| DF_REF_INSN_INFO (this_ref) = info; |
| DF_REF_CHAIN (this_ref) = NULL; |
| DF_REF_FLAGS (this_ref) = ref_flags; |
| DF_REF_NEXT_REG (this_ref) = NULL; |
| DF_REF_PREV_REG (this_ref) = NULL; |
| DF_REF_ORDER (this_ref) = df->ref_order++; |
| |
| /* We need to clear this bit because fwprop, and in the future |
| possibly other optimizations sometimes create new refs using ond |
| refs as the model. */ |
| DF_REF_FLAGS_CLEAR (this_ref, DF_HARD_REG_LIVE); |
| |
| /* See if this ref needs to have DF_HARD_REG_LIVE bit set. */ |
| if (regno < FIRST_PSEUDO_REGISTER |
| && !DF_REF_IS_ARTIFICIAL (this_ref) |
| && !DEBUG_INSN_P (DF_REF_INSN (this_ref))) |
| { |
| if (DF_REF_REG_DEF_P (this_ref)) |
| { |
| if (!DF_REF_FLAGS_IS_SET (this_ref, DF_REF_MAY_CLOBBER)) |
| DF_REF_FLAGS_SET (this_ref, DF_HARD_REG_LIVE); |
| } |
| else if (!(TEST_HARD_REG_BIT (elim_reg_set, regno) |
| && (regno == FRAME_POINTER_REGNUM |
| || regno == ARG_POINTER_REGNUM))) |
| DF_REF_FLAGS_SET (this_ref, DF_HARD_REG_LIVE); |
| } |
| |
| if (collection_rec) |
| { |
| if (DF_REF_REG_DEF_P (this_ref)) |
| collection_rec->def_vec.safe_push (this_ref); |
| else if (DF_REF_FLAGS (this_ref) & DF_REF_IN_NOTE) |
| collection_rec->eq_use_vec.safe_push (this_ref); |
| else |
| collection_rec->use_vec.safe_push (this_ref); |
| } |
| else |
| df_install_ref_incremental (this_ref); |
| |
| return this_ref; |
| } |
| |
| |
| /* Create new references of type DF_REF_TYPE for each part of register REG |
| at address LOC within INSN of BB. */ |
| |
| |
| static void |
| df_ref_record (enum df_ref_class cl, |
| class df_collection_rec *collection_rec, |
| rtx reg, rtx *loc, |
| basic_block bb, struct df_insn_info *insn_info, |
| enum df_ref_type ref_type, |
| int ref_flags) |
| { |
| unsigned int regno; |
| |
| gcc_checking_assert (REG_P (reg) || GET_CODE (reg) == SUBREG); |
| |
| regno = REGNO (GET_CODE (reg) == SUBREG ? SUBREG_REG (reg) : reg); |
| if (regno < FIRST_PSEUDO_REGISTER) |
| { |
| struct df_mw_hardreg *hardreg = NULL; |
| struct df_scan_problem_data *problem_data |
| = (struct df_scan_problem_data *) df_scan->problem_data; |
| unsigned int i; |
| unsigned int endregno; |
| df_ref ref; |
| |
| if (GET_CODE (reg) == SUBREG) |
| { |
| regno += subreg_regno_offset (regno, GET_MODE (SUBREG_REG (reg)), |
| SUBREG_BYTE (reg), GET_MODE (reg)); |
| endregno = regno + subreg_nregs (reg); |
| } |
| else |
| endregno = END_REGNO (reg); |
| |
| /* If this is a multiword hardreg, we create some extra |
| datastructures that will enable us to easily build REG_DEAD |
| and REG_UNUSED notes. */ |
| if (collection_rec |
| && (endregno != regno + 1) && insn_info) |
| { |
| /* Sets to a subreg of a multiword register are partial. |
| Sets to a non-subreg of a multiword register are not. */ |
| if (GET_CODE (reg) == SUBREG) |
| ref_flags |= DF_REF_PARTIAL; |
| ref_flags |= DF_REF_MW_HARDREG; |
| |
| hardreg = problem_data->mw_reg_pool->allocate (); |
| hardreg->type = ref_type; |
| hardreg->flags = ref_flags; |
| hardreg->mw_reg = reg; |
| hardreg->start_regno = regno; |
| hardreg->end_regno = endregno - 1; |
| hardreg->mw_order = df->ref_order++; |
| collection_rec->mw_vec.safe_push (hardreg); |
| } |
| |
| for (i = regno; i < endregno; i++) |
| { |
| ref = df_ref_create_structure (cl, collection_rec, regno_reg_rtx[i], loc, |
| bb, insn_info, ref_type, ref_flags); |
| |
| gcc_assert (ORIGINAL_REGNO (DF_REF_REG (ref)) == i); |
| } |
| } |
| else |
| { |
| df_ref_create_structure (cl, collection_rec, reg, loc, bb, insn_info, |
| ref_type, ref_flags); |
| } |
| } |
| |
| |
| /* Process all the registers defined in the rtx pointed by LOC. |
| Autoincrement/decrement definitions will be picked up by df_uses_record. |
| Any change here has to be matched in df_find_hard_reg_defs_1. */ |
| |
| static void |
| df_def_record_1 (class df_collection_rec *collection_rec, |
| rtx *loc, basic_block bb, struct df_insn_info *insn_info, |
| int flags) |
| { |
| rtx dst = *loc; |
| |
| /* It is legal to have a set destination be a parallel. */ |
| if (GET_CODE (dst) == PARALLEL) |
| { |
| int i; |
| for (i = XVECLEN (dst, 0) - 1; i >= 0; i--) |
| { |
| rtx temp = XVECEXP (dst, 0, i); |
| gcc_assert (GET_CODE (temp) == EXPR_LIST); |
| df_def_record_1 (collection_rec, &XEXP (temp, 0), |
| bb, insn_info, flags); |
| } |
| return; |
| } |
| |
| if (GET_CODE (dst) == STRICT_LOW_PART) |
| { |
| flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL | DF_REF_STRICT_LOW_PART; |
| |
| loc = &XEXP (dst, 0); |
| dst = *loc; |
| } |
| |
| if (GET_CODE (dst) == ZERO_EXTRACT) |
| { |
| flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL | DF_REF_ZERO_EXTRACT; |
| |
| loc = &XEXP (dst, 0); |
| dst = *loc; |
| } |
| |
| /* At this point if we do not have a reg or a subreg, just return. */ |
| if (REG_P (dst)) |
| { |
| df_ref_record (DF_REF_REGULAR, collection_rec, |
| dst, loc, bb, insn_info, DF_REF_REG_DEF, flags); |
| |
| /* We want to keep sp alive everywhere - by making all |
| writes to sp also use of sp. */ |
| if (REGNO (dst) == STACK_POINTER_REGNUM) |
| df_ref_record (DF_REF_BASE, collection_rec, |
| dst, NULL, bb, insn_info, DF_REF_REG_USE, flags); |
| } |
| else if (GET_CODE (dst) == SUBREG && REG_P (SUBREG_REG (dst))) |
| { |
| if (read_modify_subreg_p (dst)) |
| flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL; |
| |
| flags |= DF_REF_SUBREG; |
| |
| df_ref_record (DF_REF_REGULAR, collection_rec, |
| dst, loc, bb, insn_info, DF_REF_REG_DEF, flags); |
| } |
| } |
| |
| |
| /* Process all the registers defined in the pattern rtx, X. Any change |
| here has to be matched in df_find_hard_reg_defs. */ |
| |
| static void |
| df_defs_record (class df_collection_rec *collection_rec, |
| rtx x, basic_block bb, struct df_insn_info *insn_info, |
| int flags) |
| { |
| RTX_CODE code = GET_CODE (x); |
| int i; |
| |
| switch (code) |
| { |
| case SET: |
| df_def_record_1 (collection_rec, &SET_DEST (x), bb, insn_info, flags); |
| break; |
| |
| case CLOBBER: |
| flags |= DF_REF_MUST_CLOBBER; |
| df_def_record_1 (collection_rec, &XEXP (x, 0), bb, insn_info, flags); |
| break; |
| |
| case COND_EXEC: |
| df_defs_record (collection_rec, COND_EXEC_CODE (x), |
| bb, insn_info, DF_REF_CONDITIONAL); |
| break; |
| |
| case PARALLEL: |
| for (i = 0; i < XVECLEN (x, 0); i++) |
| df_defs_record (collection_rec, XVECEXP (x, 0, i), |
| bb, insn_info, flags); |
| break; |
| default: |
| /* No DEFs to record in other cases */ |
| break; |
| } |
| } |
| |
| /* Set bits in *DEFS for hard registers found in the rtx DST, which is the |
| destination of a set or clobber. This has to match the logic in |
| df_defs_record_1. */ |
| |
| static void |
| df_find_hard_reg_defs_1 (rtx dst, HARD_REG_SET *defs) |
| { |
| /* It is legal to have a set destination be a parallel. */ |
| if (GET_CODE (dst) == PARALLEL) |
| { |
| int i; |
| for (i = XVECLEN (dst, 0) - 1; i >= 0; i--) |
| { |
| rtx temp = XVECEXP (dst, 0, i); |
| gcc_assert (GET_CODE (temp) == EXPR_LIST); |
| df_find_hard_reg_defs_1 (XEXP (temp, 0), defs); |
| } |
| return; |
| } |
| |
| if (GET_CODE (dst) == STRICT_LOW_PART) |
| dst = XEXP (dst, 0); |
| |
| if (GET_CODE (dst) == ZERO_EXTRACT) |
| dst = XEXP (dst, 0); |
| |
| /* At this point if we do not have a reg or a subreg, just return. */ |
| if (REG_P (dst) && HARD_REGISTER_P (dst)) |
| SET_HARD_REG_BIT (*defs, REGNO (dst)); |
| else if (GET_CODE (dst) == SUBREG |
| && REG_P (SUBREG_REG (dst)) && HARD_REGISTER_P (dst)) |
| SET_HARD_REG_BIT (*defs, REGNO (SUBREG_REG (dst))); |
| } |
| |
| /* Set bits in *DEFS for hard registers defined in the pattern X. This |
| has to match the logic in df_defs_record. */ |
| |
| static void |
| df_find_hard_reg_defs (rtx x, HARD_REG_SET *defs) |
| { |
| RTX_CODE code = GET_CODE (x); |
| int i; |
| |
| switch (code) |
| { |
| case SET: |
| df_find_hard_reg_defs_1 (SET_DEST (x), defs); |
| break; |
| |
| case CLOBBER: |
| df_find_hard_reg_defs_1 (XEXP (x, 0), defs); |
| break; |
| |
| case COND_EXEC: |
| df_find_hard_reg_defs (COND_EXEC_CODE (x), defs); |
| break; |
| |
| case PARALLEL: |
| for (i = 0; i < XVECLEN (x, 0); i++) |
| df_find_hard_reg_defs (XVECEXP (x, 0, i), defs); |
| break; |
| default: |
| /* No DEFs to record in other cases */ |
| break; |
| } |
| } |
| |
| |
| /* Process all the registers used in the rtx at address LOC. */ |
| |
| static void |
| df_uses_record (class df_collection_rec *collection_rec, |
| rtx *loc, enum df_ref_type ref_type, |
| basic_block bb, struct df_insn_info *insn_info, |
| int flags) |
| { |
| RTX_CODE code; |
| rtx x; |
| |
| retry: |
| x = *loc; |
| if (!x) |
| return; |
| code = GET_CODE (x); |
| switch (code) |
| { |
| case LABEL_REF: |
| case SYMBOL_REF: |
| case CONST: |
| CASE_CONST_ANY: |
| case PC: |
| case CC0: |
| case ADDR_VEC: |
| case ADDR_DIFF_VEC: |
| return; |
| |
| case CLOBBER: |
| /* If we are clobbering a MEM, mark any registers inside the address |
| as being used. */ |
| if (MEM_P (XEXP (x, 0))) |
| df_uses_record (collection_rec, |
| &XEXP (XEXP (x, 0), 0), |
| DF_REF_REG_MEM_STORE, |
| bb, insn_info, |
| flags); |
| |
| /* If we're clobbering a REG then we have a def so ignore. */ |
| return; |
| |
| case MEM: |
| df_uses_record (collection_rec, |
| &XEXP (x, 0), DF_REF_REG_MEM_LOAD, |
| bb, insn_info, flags & DF_REF_IN_NOTE); |
| return; |
| |
| case SUBREG: |
| /* While we're here, optimize this case. */ |
| flags |= DF_REF_PARTIAL; |
| /* In case the SUBREG is not of a REG, do not optimize. */ |
| if (!REG_P (SUBREG_REG (x))) |
| { |
| loc = &SUBREG_REG (x); |
| df_uses_record (collection_rec, loc, ref_type, bb, insn_info, flags); |
| return; |
| } |
| /* Fall through */ |
| |
| case REG: |
| df_ref_record (DF_REF_REGULAR, collection_rec, |
| x, loc, bb, insn_info, |
| ref_type, flags); |
| return; |
| |
| case SIGN_EXTRACT: |
| case ZERO_EXTRACT: |
| { |
| df_uses_record (collection_rec, |
| &XEXP (x, 1), ref_type, bb, insn_info, flags); |
| df_uses_record (collection_rec, |
| &XEXP (x, 2), ref_type, bb, insn_info, flags); |
| |
| /* If the parameters to the zero or sign extract are |
| constants, strip them off and recurse, otherwise there is |
| no information that we can gain from this operation. */ |
| if (code == ZERO_EXTRACT) |
| flags |= DF_REF_ZERO_EXTRACT; |
| else |
| flags |= DF_REF_SIGN_EXTRACT; |
| |
| df_uses_record (collection_rec, |
| &XEXP (x, 0), ref_type, bb, insn_info, flags); |
| return; |
| } |
| break; |
| |
| case SET: |
| { |
| rtx dst = SET_DEST (x); |
| gcc_assert (!(flags & DF_REF_IN_NOTE)); |
| df_uses_record (collection_rec, |
| &SET_SRC (x), DF_REF_REG_USE, bb, insn_info, flags); |
| |
| switch (GET_CODE (dst)) |
| { |
| case SUBREG: |
| if (read_modify_subreg_p (dst)) |
| { |
| df_uses_record (collection_rec, &SUBREG_REG (dst), |
| DF_REF_REG_USE, bb, insn_info, |
| flags | DF_REF_READ_WRITE | DF_REF_SUBREG); |
| break; |
| } |
| /* Fall through. */ |
| case REG: |
| case PARALLEL: |
| case SCRATCH: |
| case PC: |
| case CC0: |
| break; |
| case MEM: |
| df_uses_record (collection_rec, &XEXP (dst, 0), |
| DF_REF_REG_MEM_STORE, bb, insn_info, flags); |
| break; |
| case STRICT_LOW_PART: |
| { |
| rtx *temp = &XEXP (dst, 0); |
| /* A strict_low_part uses the whole REG and not just the |
| SUBREG. */ |
| dst = XEXP (dst, 0); |
| df_uses_record (collection_rec, |
| (GET_CODE (dst) == SUBREG) ? &SUBREG_REG (dst) : temp, |
| DF_REF_REG_USE, bb, insn_info, |
| DF_REF_READ_WRITE | DF_REF_STRICT_LOW_PART); |
| } |
| break; |
| case ZERO_EXTRACT: |
| { |
| df_uses_record (collection_rec, &XEXP (dst, 1), |
| DF_REF_REG_USE, bb, insn_info, flags); |
| df_uses_record (collection_rec, &XEXP (dst, 2), |
| DF_REF_REG_USE, bb, insn_info, flags); |
| if (GET_CODE (XEXP (dst,0)) == MEM) |
| df_uses_record (collection_rec, &XEXP (dst, 0), |
| DF_REF_REG_USE, bb, insn_info, |
| flags); |
| else |
| df_uses_record (collection_rec, &XEXP (dst, 0), |
| DF_REF_REG_USE, bb, insn_info, |
| DF_REF_READ_WRITE | DF_REF_ZERO_EXTRACT); |
| } |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| return; |
| } |
| |
| case RETURN: |
| case SIMPLE_RETURN: |
| break; |
| |
| case ASM_OPERANDS: |
| case UNSPEC_VOLATILE: |
| case TRAP_IF: |
| case ASM_INPUT: |
| { |
| /* Traditional and volatile asm instructions must be |
| considered to use and clobber all hard registers, all |
| pseudo-registers and all of memory. So must TRAP_IF and |
| UNSPEC_VOLATILE operations. |
| |
| Consider for instance a volatile asm that changes the fpu |
| rounding mode. An insn should not be moved across this |
| even if it only uses pseudo-regs because it might give an |
| incorrectly rounded result. |
| |
| However, flow.c's liveness computation did *not* do this, |
| giving the reasoning as " ?!? Unfortunately, marking all |
| hard registers as live causes massive problems for the |
| register allocator and marking all pseudos as live creates |
| mountains of uninitialized variable warnings." |
| |
| In order to maintain the status quo with regard to liveness |
| and uses, we do what flow.c did and just mark any regs we |
| can find in ASM_OPERANDS as used. In global asm insns are |
| scanned and regs_asm_clobbered is filled out. |
| |
| For all ASM_OPERANDS, we must traverse the vector of input |
| operands. We cannot just fall through here since then we |
| would be confused by the ASM_INPUT rtx inside ASM_OPERANDS, |
| which do not indicate traditional asms unlike their normal |
| usage. */ |
| if (code == ASM_OPERANDS) |
| { |
| int j; |
| |
| for (j = 0; j < ASM_OPERANDS_INPUT_LENGTH (x); j++) |
| df_uses_record (collection_rec, &ASM_OPERANDS_INPUT (x, j), |
| DF_REF_REG_USE, bb, insn_info, flags); |
| return; |
| } |
| break; |
| } |
| |
| case VAR_LOCATION: |
| df_uses_record (collection_rec, |
| &PAT_VAR_LOCATION_LOC (x), |
| DF_REF_REG_USE, bb, insn_info, flags); |
| return; |
| |
| case PRE_DEC: |
| case POST_DEC: |
| case PRE_INC: |
| case POST_INC: |
| case PRE_MODIFY: |
| case POST_MODIFY: |
| gcc_assert (!DEBUG_INSN_P (insn_info->insn)); |
| /* Catch the def of the register being modified. */ |
| df_ref_record (DF_REF_REGULAR, collection_rec, XEXP (x, 0), &XEXP (x, 0), |
| bb, insn_info, |
| DF_REF_REG_DEF, |
| flags | DF_REF_READ_WRITE | DF_REF_PRE_POST_MODIFY); |
| |
| /* ... Fall through to handle uses ... */ |
| |
| default: |
| break; |
| } |
| |
| /* Recursively scan the operands of this expression. */ |
| { |
| const char *fmt = GET_RTX_FORMAT (code); |
| int i; |
| |
| for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
| { |
| if (fmt[i] == 'e') |
| { |
| /* Tail recursive case: save a function call level. */ |
| if (i == 0) |
| { |
| loc = &XEXP (x, 0); |
| goto retry; |
| } |
| df_uses_record (collection_rec, &XEXP (x, i), ref_type, |
| bb, insn_info, flags); |
| } |
| else if (fmt[i] == 'E') |
| { |
| int j; |
| for (j = 0; j < XVECLEN (x, i); j++) |
| df_uses_record (collection_rec, |
| &XVECEXP (x, i, j), ref_type, |
| bb, insn_info, flags); |
| } |
| } |
| } |
| |
| return; |
| } |
| |
| |
| /* For all DF_REF_CONDITIONAL defs, add a corresponding uses. */ |
| |
| static void |
| df_get_conditional_uses (class df_collection_rec *collection_rec) |
| { |
| unsigned int ix; |
| df_ref ref; |
| |
| FOR_EACH_VEC_ELT (collection_rec->def_vec, ix, ref) |
| { |
| if (DF_REF_FLAGS_IS_SET (ref, DF_REF_CONDITIONAL)) |
| { |
| df_ref use; |
| |
| use = df_ref_create_structure (DF_REF_CLASS (ref), collection_rec, DF_REF_REG (ref), |
| DF_REF_LOC (ref), DF_REF_BB (ref), |
| DF_REF_INSN_INFO (ref), DF_REF_REG_USE, |
| DF_REF_FLAGS (ref) & ~DF_REF_CONDITIONAL); |
| DF_REF_REGNO (use) = DF_REF_REGNO (ref); |
| } |
| } |
| } |
| |
| |
| /* Get call's extra defs and uses (track caller-saved registers). */ |
| |
| static void |
| df_get_call_refs (class df_collection_rec *collection_rec, |
| basic_block bb, |
| struct df_insn_info *insn_info, |
| int flags) |
| { |
| rtx note; |
| bool is_sibling_call; |
| unsigned int i; |
| HARD_REG_SET defs_generated; |
| |
| CLEAR_HARD_REG_SET (defs_generated); |
| df_find_hard_reg_defs (PATTERN (insn_info->insn), &defs_generated); |
| is_sibling_call = SIBLING_CALL_P (insn_info->insn); |
| function_abi callee_abi = insn_callee_abi (insn_info->insn); |
| |
| for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
| { |
| if (i == STACK_POINTER_REGNUM) |
| /* The stack ptr is used (honorarily) by a CALL insn. */ |
| df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i], |
| NULL, bb, insn_info, DF_REF_REG_USE, |
| DF_REF_CALL_STACK_USAGE | flags); |
| else if (global_regs[i]) |
| { |
| /* Calls to const functions cannot access any global registers and |
| calls to pure functions cannot set them. All other calls may |
| reference any of the global registers, so they are recorded as |
| used. */ |
| if (!RTL_CONST_CALL_P (insn_info->insn)) |
| { |
| df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i], |
| NULL, bb, insn_info, DF_REF_REG_USE, flags); |
| if (!RTL_PURE_CALL_P (insn_info->insn)) |
| df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i], |
| NULL, bb, insn_info, DF_REF_REG_DEF, flags); |
| } |
| } |
| else if (callee_abi.clobbers_full_reg_p (i) |
| /* no clobbers for regs that are the result of the call */ |
| && !TEST_HARD_REG_BIT (defs_generated, i) |
| && (!is_sibling_call |
| || !bitmap_bit_p (df->exit_block_uses, i) |
| || refers_to_regno_p (i, crtl->return_rtx))) |
| df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i], |
| NULL, bb, insn_info, DF_REF_REG_DEF, |
| DF_REF_MAY_CLOBBER | flags); |
| } |
| |
| /* Record the registers used to pass arguments, and explicitly |
| noted as clobbered. */ |
| for (note = CALL_INSN_FUNCTION_USAGE (insn_info->insn); note; |
| note = XEXP (note, 1)) |
| { |
| if (GET_CODE (XEXP (note, 0)) == USE) |
| df_uses_record (collection_rec, &XEXP (XEXP (note, 0), 0), |
| DF_REF_REG_USE, bb, insn_info, flags); |
| else if (GET_CODE (XEXP (note, 0)) == CLOBBER) |
| { |
| if (REG_P (XEXP (XEXP (note, 0), 0))) |
| { |
| unsigned int regno = REGNO (XEXP (XEXP (note, 0), 0)); |
| if (!TEST_HARD_REG_BIT (defs_generated, regno)) |
| df_defs_record (collection_rec, XEXP (note, 0), bb, |
| insn_info, flags); |
| } |
| else |
| df_uses_record (collection_rec, &XEXP (note, 0), |
| DF_REF_REG_USE, bb, insn_info, flags); |
| } |
| } |
| |
| return; |
| } |
| |
| /* Collect all refs in the INSN. This function is free of any |
|