| /* Subroutines used for code generation on Renesas RL78 processors. |
| Copyright (C) 2011-2015 Free Software Foundation, Inc. |
| Contributed by Red Hat. |
| |
| 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 "tm.h" |
| #include "hash-set.h" |
| #include "machmode.h" |
| #include "vec.h" |
| #include "double-int.h" |
| #include "input.h" |
| #include "alias.h" |
| #include "symtab.h" |
| #include "wide-int.h" |
| #include "inchash.h" |
| #include "tree.h" |
| #include "fold-const.h" |
| #include "varasm.h" |
| #include "stor-layout.h" |
| #include "calls.h" |
| #include "rtl.h" |
| #include "regs.h" |
| #include "hard-reg-set.h" |
| #include "insn-config.h" |
| #include "conditions.h" |
| #include "output.h" |
| #include "insn-attr.h" |
| #include "flags.h" |
| #include "function.h" |
| #include "hashtab.h" |
| #include "statistics.h" |
| #include "real.h" |
| #include "fixed-value.h" |
| #include "expmed.h" |
| #include "dojump.h" |
| #include "explow.h" |
| #include "emit-rtl.h" |
| #include "stmt.h" |
| #include "expr.h" |
| #include "insn-codes.h" |
| #include "optabs.h" |
| #include "libfuncs.h" |
| #include "recog.h" |
| #include "diagnostic-core.h" |
| #include "toplev.h" |
| #include "reload.h" |
| #include "dominance.h" |
| #include "cfg.h" |
| #include "cfgrtl.h" |
| #include "cfganal.h" |
| #include "lcm.h" |
| #include "cfgbuild.h" |
| #include "cfgcleanup.h" |
| #include "predict.h" |
| #include "basic-block.h" |
| #include "df.h" |
| #include "ggc.h" |
| #include "tm_p.h" |
| #include "debug.h" |
| #include "target.h" |
| #include "target-def.h" |
| #include "langhooks.h" |
| #include "rl78-protos.h" |
| #include "dumpfile.h" |
| #include "tree-pass.h" |
| #include "context.h" |
| #include "tm-constrs.h" /* for satisfies_constraint_*(). */ |
| #include "insn-flags.h" /* for gen_*(). */ |
| #include "builtins.h" |
| #include "stringpool.h" |
| |
| static inline bool is_interrupt_func (const_tree decl); |
| static inline bool is_brk_interrupt_func (const_tree decl); |
| static void rl78_reorg (void); |
| static const char *rl78_strip_name_encoding (const char *); |
| static const char *rl78_strip_nonasm_name_encoding (const char *); |
| static section * rl78_select_section (tree, int, unsigned HOST_WIDE_INT); |
| |
| |
| /* Debugging statements are tagged with DEBUG0 only so that they can |
| be easily enabled individually, by replacing the '0' with '1' as |
| needed. */ |
| #define DEBUG0 0 |
| #define DEBUG1 1 |
| |
| /* REGISTER_NAMES has the names for individual 8-bit registers, but |
| these have the names we need to use when referring to 16-bit |
| register pairs. */ |
| static const char * const word_regnames[] = |
| { |
| "ax", "AX", "bc", "BC", "de", "DE", "hl", "HL", |
| "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| "sp", "ap", "psw", "es", "cs" |
| }; |
| |
| struct GTY(()) machine_function |
| { |
| /* If set, the rest of the fields have been computed. */ |
| int computed; |
| /* Which register pairs need to be pushed in the prologue. */ |
| int need_to_push [FIRST_PSEUDO_REGISTER / 2]; |
| |
| /* These fields describe the frame layout... */ |
| /* arg pointer */ |
| /* 4 bytes for saved PC */ |
| int framesize_regs; |
| /* frame pointer */ |
| int framesize_locals; |
| int framesize_outgoing; |
| /* stack pointer */ |
| int framesize; |
| |
| /* If set, recog is allowed to match against the "real" patterns. */ |
| int real_insns_ok; |
| /* If set, recog is allowed to match against the "virtual" patterns. */ |
| int virt_insns_ok; |
| /* Set if the current function needs to clean up any trampolines. */ |
| int trampolines_used; |
| /* True if the ES register is used and hence |
| needs to be saved inside interrupt handlers. */ |
| bool uses_es; |
| }; |
| |
| /* This is our init_machine_status, as set in |
| rl78_option_override. */ |
| static struct machine_function * |
| rl78_init_machine_status (void) |
| { |
| struct machine_function *m; |
| |
| m = ggc_cleared_alloc<machine_function> (); |
| m->virt_insns_ok = 1; |
| |
| return m; |
| } |
| |
| /* This pass converts virtual instructions using virtual registers, to |
| real instructions using real registers. Rather than run it as |
| reorg, we reschedule it before vartrack to help with debugging. */ |
| namespace |
| { |
| const pass_data pass_data_rl78_devirt = |
| { |
| RTL_PASS, /* type */ |
| "devirt", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| TV_MACH_DEP, /* tv_id */ |
| 0, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0, /* todo_flags_finish */ |
| }; |
| |
| class pass_rl78_devirt : public rtl_opt_pass |
| { |
| public: |
| pass_rl78_devirt (gcc::context *ctxt) |
| : rtl_opt_pass (pass_data_rl78_devirt, ctxt) |
| { |
| } |
| |
| /* opt_pass methods: */ |
| virtual unsigned int execute (function *) |
| { |
| rl78_reorg (); |
| return 0; |
| } |
| }; |
| } // anon namespace |
| |
| rtl_opt_pass * |
| make_pass_rl78_devirt (gcc::context *ctxt) |
| { |
| return new pass_rl78_devirt (ctxt); |
| } |
| |
| /* Redundant move elimination pass. Must be run after the basic block |
| reordering pass for the best effect. */ |
| |
| static unsigned int |
| move_elim_pass (void) |
| { |
| rtx_insn *insn, *ninsn; |
| rtx prev = NULL_RTX; |
| |
| for (insn = get_insns (); insn; insn = ninsn) |
| { |
| rtx set; |
| |
| ninsn = next_nonnote_nondebug_insn (insn); |
| |
| if ((set = single_set (insn)) == NULL_RTX) |
| { |
| prev = NULL_RTX; |
| continue; |
| } |
| |
| /* If we have two SET insns in a row (without anything |
| between them) and the source of the second one is the |
| destination of the first one, and vice versa, then we |
| can eliminate the second SET. */ |
| if (prev |
| && rtx_equal_p (SET_DEST (prev), SET_SRC (set)) |
| && rtx_equal_p (SET_DEST (set), SET_SRC (prev)) |
| /* ... and none of the operands are volatile. */ |
| && ! volatile_refs_p (SET_SRC (prev)) |
| && ! volatile_refs_p (SET_DEST (prev)) |
| && ! volatile_refs_p (SET_SRC (set)) |
| && ! volatile_refs_p (SET_DEST (set))) |
| { |
| if (dump_file) |
| fprintf (dump_file, " Delete insn %d because it is redundant\n", |
| INSN_UID (insn)); |
| |
| delete_insn (insn); |
| prev = NULL_RTX; |
| } |
| else |
| prev = set; |
| } |
| |
| if (dump_file) |
| print_rtl_with_bb (dump_file, get_insns (), 0); |
| |
| return 0; |
| } |
| |
| namespace |
| { |
| const pass_data pass_data_rl78_move_elim = |
| { |
| RTL_PASS, /* type */ |
| "move_elim", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| TV_MACH_DEP, /* tv_id */ |
| 0, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0, /* todo_flags_finish */ |
| }; |
| |
| class pass_rl78_move_elim : public rtl_opt_pass |
| { |
| public: |
| pass_rl78_move_elim (gcc::context *ctxt) |
| : rtl_opt_pass (pass_data_rl78_move_elim, ctxt) |
| { |
| } |
| |
| /* opt_pass methods: */ |
| virtual unsigned int execute (function *) { return move_elim_pass (); } |
| }; |
| } // anon namespace |
| |
| rtl_opt_pass * |
| make_pass_rl78_move_elim (gcc::context *ctxt) |
| { |
| return new pass_rl78_move_elim (ctxt); |
| } |
| |
| #undef TARGET_ASM_FILE_START |
| #define TARGET_ASM_FILE_START rl78_asm_file_start |
| |
| static void |
| rl78_asm_file_start (void) |
| { |
| int i; |
| |
| if (TARGET_G10) |
| { |
| /* The memory used is 0xffec8 to 0xffedf; real registers are in |
| 0xffee0 to 0xffee7. */ |
| for (i = 8; i < 32; i++) |
| fprintf (asm_out_file, "r%d\t=\t0x%x\n", i, 0xffec0 + i); |
| } |
| else |
| { |
| for (i = 0; i < 8; i++) |
| { |
| fprintf (asm_out_file, "r%d\t=\t0x%x\n", 8 + i, 0xffef0 + i); |
| fprintf (asm_out_file, "r%d\t=\t0x%x\n", 16 + i, 0xffee8 + i); |
| fprintf (asm_out_file, "r%d\t=\t0x%x\n", 24 + i, 0xffee0 + i); |
| } |
| } |
| |
| opt_pass *rl78_devirt_pass = make_pass_rl78_devirt (g); |
| struct register_pass_info rl78_devirt_info = |
| { |
| rl78_devirt_pass, |
| "pro_and_epilogue", |
| 1, |
| PASS_POS_INSERT_BEFORE |
| }; |
| |
| opt_pass *rl78_move_elim_pass = make_pass_rl78_move_elim (g); |
| struct register_pass_info rl78_move_elim_info = |
| { |
| rl78_move_elim_pass, |
| "bbro", |
| 1, |
| PASS_POS_INSERT_AFTER |
| }; |
| |
| register_pass (& rl78_devirt_info); |
| register_pass (& rl78_move_elim_info); |
| } |
| |
| void |
| rl78_output_symbol_ref (FILE * file, rtx sym) |
| { |
| tree type = SYMBOL_REF_DECL (sym); |
| const char *str = XSTR (sym, 0); |
| |
| if (str[0] == '*') |
| { |
| fputs (str + 1, file); |
| } |
| else |
| { |
| str = rl78_strip_nonasm_name_encoding (str); |
| if (type && TREE_CODE (type) == FUNCTION_DECL) |
| { |
| fprintf (file, "%%code("); |
| assemble_name (file, str); |
| fprintf (file, ")"); |
| } |
| else |
| assemble_name (file, str); |
| } |
| } |
| |
| #undef TARGET_OPTION_OVERRIDE |
| #define TARGET_OPTION_OVERRIDE rl78_option_override |
| |
| static void |
| rl78_option_override (void) |
| { |
| flag_omit_frame_pointer = 1; |
| flag_no_function_cse = 1; |
| flag_split_wide_types = 0; |
| |
| init_machine_status = rl78_init_machine_status; |
| |
| if (TARGET_ALLREGS) |
| { |
| int i; |
| |
| for (i = 24; i < 32; i++) |
| fixed_regs[i] = 0; |
| } |
| |
| if (TARGET_ES0 |
| && strcmp (lang_hooks.name, "GNU C") |
| /* Compiling with -flto results in a language of GNU GIMPLE being used... */ |
| && strcmp (lang_hooks.name, "GNU GIMPLE")) |
| /* Address spaces are currently only supported by C. */ |
| error ("-mes0 can only be used with C"); |
| } |
| |
| /* Most registers are 8 bits. Some are 16 bits because, for example, |
| gcc doesn't like dealing with $FP as a register pair (the second |
| half of $fp is also 2 to keep reload happy wrt register pairs, but |
| no register class includes it). This table maps register numbers |
| to size in bytes. */ |
| static const int register_sizes[] = |
| { |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 2, 2, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 2, 2, 1, 1, 1 |
| }; |
| |
| /* Predicates used in the MD patterns. This one is true when virtual |
| insns may be matched, which typically means before (or during) the |
| devirt pass. */ |
| bool |
| rl78_virt_insns_ok (void) |
| { |
| if (cfun) |
| return cfun->machine->virt_insns_ok; |
| return true; |
| } |
| |
| /* Predicates used in the MD patterns. This one is true when real |
| insns may be matched, which typically means after (or during) the |
| devirt pass. */ |
| bool |
| rl78_real_insns_ok (void) |
| { |
| if (cfun) |
| return cfun->machine->real_insns_ok; |
| return false; |
| } |
| |
| /* Implements HARD_REGNO_NREGS. */ |
| int |
| rl78_hard_regno_nregs (int regno, machine_mode mode) |
| { |
| int rs = register_sizes[regno]; |
| if (rs < 1) |
| rs = 1; |
| return ((GET_MODE_SIZE (mode) + rs - 1) / rs); |
| } |
| |
| /* Implements HARD_REGNO_MODE_OK. */ |
| int |
| rl78_hard_regno_mode_ok (int regno, machine_mode mode) |
| { |
| int s = GET_MODE_SIZE (mode); |
| |
| if (s < 1) |
| return 0; |
| /* These are not to be used by gcc. */ |
| if (regno == 23 || regno == ES_REG || regno == CS_REG) |
| return 0; |
| /* $fp can always be accessed as a 16-bit value. */ |
| if (regno == FP_REG && s == 2) |
| return 1; |
| if (regno < SP_REG) |
| { |
| /* Since a reg-reg move is really a reg-mem move, we must |
| enforce alignment. */ |
| if (s > 1 && (regno % 2)) |
| return 0; |
| return 1; |
| } |
| if (s == CC_REGNUM) |
| return (mode == BImode); |
| /* All other registers must be accessed in their natural sizes. */ |
| if (s == register_sizes [regno]) |
| return 1; |
| return 0; |
| } |
| |
| /* Simplify_gen_subreg() doesn't handle memory references the way we |
| need it to below, so we use this function for when we must get a |
| valid subreg in a "natural" state. */ |
| static rtx |
| rl78_subreg (machine_mode mode, rtx r, machine_mode omode, int byte) |
| { |
| if (GET_CODE (r) == MEM) |
| return adjust_address (r, mode, byte); |
| else |
| return simplify_gen_subreg (mode, r, omode, byte); |
| } |
| |
| /* Used by movsi. Split SImode moves into two HImode moves, using |
| appropriate patterns for the upper and lower halves of symbols. */ |
| void |
| rl78_expand_movsi (rtx *operands) |
| { |
| rtx op00, op02, op10, op12; |
| |
| op00 = rl78_subreg (HImode, operands[0], SImode, 0); |
| op02 = rl78_subreg (HImode, operands[0], SImode, 2); |
| if (GET_CODE (operands[1]) == CONST |
| || GET_CODE (operands[1]) == SYMBOL_REF) |
| { |
| op10 = gen_rtx_ZERO_EXTRACT (HImode, operands[1], GEN_INT (16), GEN_INT (0)); |
| op10 = gen_rtx_CONST (HImode, op10); |
| op12 = gen_rtx_ZERO_EXTRACT (HImode, operands[1], GEN_INT (16), GEN_INT (16)); |
| op12 = gen_rtx_CONST (HImode, op12); |
| } |
| else |
| { |
| op10 = rl78_subreg (HImode, operands[1], SImode, 0); |
| op12 = rl78_subreg (HImode, operands[1], SImode, 2); |
| } |
| |
| if (rtx_equal_p (operands[0], operands[1])) |
| ; |
| else if (rtx_equal_p (op00, op12)) |
| { |
| emit_move_insn (op02, op12); |
| emit_move_insn (op00, op10); |
| } |
| else |
| { |
| emit_move_insn (op00, op10); |
| emit_move_insn (op02, op12); |
| } |
| } |
| |
| /* Generate code to move an SImode value. */ |
| void |
| rl78_split_movsi (rtx *operands, enum machine_mode omode) |
| { |
| rtx op00, op02, op10, op12; |
| |
| op00 = rl78_subreg (HImode, operands[0], omode, 0); |
| op02 = rl78_subreg (HImode, operands[0], omode, 2); |
| |
| if (GET_CODE (operands[1]) == CONST |
| || GET_CODE (operands[1]) == SYMBOL_REF) |
| { |
| op10 = gen_rtx_ZERO_EXTRACT (HImode, operands[1], GEN_INT (16), GEN_INT (0)); |
| op10 = gen_rtx_CONST (HImode, op10); |
| op12 = gen_rtx_ZERO_EXTRACT (HImode, operands[1], GEN_INT (16), GEN_INT (16)); |
| op12 = gen_rtx_CONST (HImode, op12); |
| } |
| else |
| { |
| op10 = rl78_subreg (HImode, operands[1], omode, 0); |
| op12 = rl78_subreg (HImode, operands[1], omode, 2); |
| } |
| |
| if (rtx_equal_p (operands[0], operands[1])) |
| ; |
| else if (rtx_equal_p (op00, op12)) |
| { |
| operands[2] = op02; |
| operands[4] = op12; |
| operands[3] = op00; |
| operands[5] = op10; |
| } |
| else |
| { |
| operands[2] = op00; |
| operands[4] = op10; |
| operands[3] = op02; |
| operands[5] = op12; |
| } |
| } |
| |
| /* Used by various two-operand expanders which cannot accept all |
| operands in the "far" namespace. Force some such operands into |
| registers so that each pattern has at most one far operand. */ |
| int |
| rl78_force_nonfar_2 (rtx *operands, rtx (*gen)(rtx,rtx)) |
| { |
| int did = 0; |
| rtx temp_reg = NULL; |
| |
| /* FIXME: in the future, be smarter about only doing this if the |
| other operand is also far, assuming the devirtualizer can also |
| handle that. */ |
| if (rl78_far_p (operands[0])) |
| { |
| temp_reg = operands[0]; |
| operands[0] = gen_reg_rtx (GET_MODE (operands[0])); |
| did = 1; |
| } |
| if (!did) |
| return 0; |
| |
| emit_insn (gen (operands[0], operands[1])); |
| if (temp_reg) |
| emit_move_insn (temp_reg, operands[0]); |
| return 1; |
| } |
| |
| /* Likewise, but for three-operand expanders. */ |
| int |
| rl78_force_nonfar_3 (rtx *operands, rtx (*gen)(rtx,rtx,rtx)) |
| { |
| int did = 0; |
| rtx temp_reg = NULL; |
| |
| /* As an exception, we allow two far operands if they're identical |
| and the third operand is not a MEM. This allows global variables |
| to be incremented, for example. */ |
| if (rtx_equal_p (operands[0], operands[1]) |
| && ! MEM_P (operands[2])) |
| return 0; |
| |
| /* FIXME: Likewise. */ |
| if (rl78_far_p (operands[1])) |
| { |
| rtx temp_reg = gen_reg_rtx (GET_MODE (operands[1])); |
| emit_move_insn (temp_reg, operands[1]); |
| operands[1] = temp_reg; |
| did = 1; |
| } |
| if (rl78_far_p (operands[0])) |
| { |
| temp_reg = operands[0]; |
| operands[0] = gen_reg_rtx (GET_MODE (operands[0])); |
| did = 1; |
| } |
| if (!did) |
| return 0; |
| |
| emit_insn (gen (operands[0], operands[1], operands[2])); |
| if (temp_reg) |
| emit_move_insn (temp_reg, operands[0]); |
| return 1; |
| } |
| |
| #undef TARGET_CAN_ELIMINATE |
| #define TARGET_CAN_ELIMINATE rl78_can_eliminate |
| |
| static bool |
| rl78_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to ATTRIBUTE_UNUSED) |
| { |
| return true; |
| } |
| |
| /* Returns true if the given register needs to be saved by the |
| current function. */ |
| static bool |
| need_to_save (unsigned int regno) |
| { |
| if (is_interrupt_func (cfun->decl)) |
| { |
| /* We don't know what devirt will need */ |
| if (regno < 8) |
| return true; |
| |
| /* We don't need to save registers that have |
| been reserved for interrupt handlers. */ |
| if (regno > 23) |
| return false; |
| |
| /* If the handler is a non-leaf function then it may call |
| non-interrupt aware routines which will happily clobber |
| any call_used registers, so we have to preserve them. */ |
| if (!crtl->is_leaf && call_used_regs[regno]) |
| return true; |
| |
| /* Otherwise we only have to save a register, call_used |
| or not, if it is used by this handler. */ |
| return df_regs_ever_live_p (regno); |
| } |
| |
| if (regno == FRAME_POINTER_REGNUM && frame_pointer_needed) |
| return true; |
| if (fixed_regs[regno]) |
| return false; |
| if (crtl->calls_eh_return) |
| return true; |
| if (df_regs_ever_live_p (regno) |
| && !call_used_regs[regno]) |
| return true; |
| return false; |
| } |
| |
| /* We use this to wrap all emitted insns in the prologue. */ |
| static rtx |
| F (rtx x) |
| { |
| RTX_FRAME_RELATED_P (x) = 1; |
| return x; |
| } |
| |
| /* Compute all the frame-related fields in our machine_function |
| structure. */ |
| static void |
| rl78_compute_frame_info (void) |
| { |
| int i; |
| |
| cfun->machine->computed = 1; |
| cfun->machine->framesize_regs = 0; |
| cfun->machine->framesize_locals = get_frame_size (); |
| cfun->machine->framesize_outgoing = crtl->outgoing_args_size; |
| |
| for (i = 0; i < 16; i ++) |
| if (need_to_save (i * 2) || need_to_save (i * 2 + 1)) |
| { |
| cfun->machine->need_to_push [i] = 1; |
| cfun->machine->framesize_regs += 2; |
| } |
| else |
| cfun->machine->need_to_push [i] = 0; |
| |
| if ((cfun->machine->framesize_locals + cfun->machine->framesize_outgoing) & 1) |
| cfun->machine->framesize_locals ++; |
| |
| cfun->machine->framesize = (cfun->machine->framesize_regs |
| + cfun->machine->framesize_locals |
| + cfun->machine->framesize_outgoing); |
| } |
| |
| /* Returns true if the provided function has the specified attribute. */ |
| static inline bool |
| has_func_attr (const_tree decl, const char * func_attr) |
| { |
| if (decl == NULL_TREE) |
| decl = current_function_decl; |
| |
| return lookup_attribute (func_attr, DECL_ATTRIBUTES (decl)) != NULL_TREE; |
| } |
| |
| /* Returns true if the provided function has the "interrupt" attribute. */ |
| static inline bool |
| is_interrupt_func (const_tree decl) |
| { |
| return has_func_attr (decl, "interrupt") || has_func_attr (decl, "brk_interrupt"); |
| } |
| |
| /* Returns true if the provided function has the "brk_interrupt" attribute. */ |
| static inline bool |
| is_brk_interrupt_func (const_tree decl) |
| { |
| return has_func_attr (decl, "brk_interrupt"); |
| } |
| |
| /* Check "interrupt" attributes. */ |
| static tree |
| rl78_handle_func_attribute (tree * node, |
| tree name, |
| tree args, |
| int flags ATTRIBUTE_UNUSED, |
| bool * no_add_attrs) |
| { |
| gcc_assert (DECL_P (* node)); |
| gcc_assert (args == NULL_TREE); |
| |
| if (TREE_CODE (* node) != FUNCTION_DECL) |
| { |
| warning (OPT_Wattributes, "%qE attribute only applies to functions", |
| name); |
| * no_add_attrs = true; |
| } |
| |
| /* FIXME: We ought to check that the interrupt and exception |
| handler attributes have been applied to void functions. */ |
| return NULL_TREE; |
| } |
| |
| /* Check "naked" attributes. */ |
| static tree |
| rl78_handle_naked_attribute (tree * node, |
| tree name ATTRIBUTE_UNUSED, |
| tree args, |
| int flags ATTRIBUTE_UNUSED, |
| bool * no_add_attrs) |
| { |
| gcc_assert (DECL_P (* node)); |
| gcc_assert (args == NULL_TREE); |
| |
| if (TREE_CODE (* node) != FUNCTION_DECL) |
| { |
| warning (OPT_Wattributes, "naked attribute only applies to functions"); |
| * no_add_attrs = true; |
| } |
| |
| /* Disable warnings about this function - eg reaching the end without |
| seeing a return statement - because the programmer is doing things |
| that gcc does not know about. */ |
| TREE_NO_WARNING (* node) = 1; |
| |
| return NULL_TREE; |
| } |
| |
| /* Check "saddr" attributes. */ |
| static tree |
| rl78_handle_saddr_attribute (tree * node, |
| tree name, |
| tree args ATTRIBUTE_UNUSED, |
| int flags ATTRIBUTE_UNUSED, |
| bool * no_add_attrs) |
| { |
| gcc_assert (DECL_P (* node)); |
| |
| if (TREE_CODE (* node) == FUNCTION_DECL) |
| { |
| warning (OPT_Wattributes, "%qE attribute doesn't apply to functions", |
| name); |
| * no_add_attrs = true; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| #undef TARGET_ATTRIBUTE_TABLE |
| #define TARGET_ATTRIBUTE_TABLE rl78_attribute_table |
| |
| /* Table of RL78-specific attributes. */ |
| const struct attribute_spec rl78_attribute_table[] = |
| { |
| /* Name, min_len, max_len, decl_req, type_req, fn_type_req, handler, |
| affects_type_identity. */ |
| { "interrupt", 0, 0, true, false, false, rl78_handle_func_attribute, |
| false }, |
| { "brk_interrupt", 0, 0, true, false, false, rl78_handle_func_attribute, |
| false }, |
| { "naked", 0, 0, true, false, false, rl78_handle_naked_attribute, |
| false }, |
| { "saddr", 0, 0, true, false, false, rl78_handle_saddr_attribute, |
| false }, |
| { NULL, 0, 0, false, false, false, NULL, false } |
| }; |
| |
| |
| |
| /* Break down an address RTX into its component base/index/addend |
| portions and return TRUE if the address is of a valid form, else |
| FALSE. */ |
| static bool |
| characterize_address (rtx x, rtx *base, rtx *index, rtx *addend) |
| { |
| *base = NULL_RTX; |
| *index = NULL_RTX; |
| *addend = NULL_RTX; |
| |
| if (GET_CODE (x) == UNSPEC |
| && XINT (x, 1) == UNS_ES_ADDR) |
| x = XVECEXP (x, 0, 1); |
| |
| if (GET_CODE (x) == REG) |
| { |
| *base = x; |
| return true; |
| } |
| |
| /* We sometimes get these without the CONST wrapper */ |
| if (GET_CODE (x) == PLUS |
| && GET_CODE (XEXP (x, 0)) == SYMBOL_REF |
| && GET_CODE (XEXP (x, 1)) == CONST_INT) |
| { |
| *addend = x; |
| return true; |
| } |
| |
| if (GET_CODE (x) == PLUS) |
| { |
| *base = XEXP (x, 0); |
| x = XEXP (x, 1); |
| |
| if (GET_CODE (*base) == SUBREG) |
| { |
| if (GET_MODE (*base) == HImode |
| && GET_MODE (XEXP (*base, 0)) == SImode |
| && GET_CODE (XEXP (*base, 0)) == REG) |
| { |
| /* This is a throw-away rtx just to tell everyone |
| else what effective register we're using. */ |
| *base = gen_rtx_REG (HImode, REGNO (XEXP (*base, 0))); |
| } |
| } |
| |
| if (GET_CODE (*base) != REG |
| && GET_CODE (x) == REG) |
| { |
| rtx tmp = *base; |
| *base = x; |
| x = tmp; |
| } |
| |
| if (GET_CODE (*base) != REG) |
| return false; |
| |
| if (GET_CODE (x) == ZERO_EXTEND |
| && GET_CODE (XEXP (x, 0)) == REG) |
| { |
| *index = XEXP (x, 0); |
| return false; |
| } |
| } |
| |
| switch (GET_CODE (x)) |
| { |
| case PLUS: |
| if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF |
| && GET_CODE (XEXP (x, 0)) == CONST_INT) |
| { |
| *addend = x; |
| return true; |
| } |
| /* fall through */ |
| case MEM: |
| case REG: |
| return false; |
| |
| case SUBREG: |
| switch (GET_CODE (XEXP (x, 0))) |
| { |
| case CONST: |
| case SYMBOL_REF: |
| case CONST_INT: |
| *addend = x; |
| return true; |
| default: |
| return false; |
| } |
| |
| case CONST: |
| case SYMBOL_REF: |
| case CONST_INT: |
| *addend = x; |
| return true; |
| |
| default: |
| return false; |
| } |
| |
| return false; |
| } |
| |
| /* Used by the Whb constraint. Match addresses that use HL+B or HL+C |
| addressing. */ |
| bool |
| rl78_hl_b_c_addr_p (rtx op) |
| { |
| rtx hl, bc; |
| |
| if (GET_CODE (op) != PLUS) |
| return false; |
| hl = XEXP (op, 0); |
| bc = XEXP (op, 1); |
| if (GET_CODE (hl) == ZERO_EXTEND) |
| { |
| rtx tmp = hl; |
| hl = bc; |
| bc = tmp; |
| } |
| if (GET_CODE (hl) != REG) |
| return false; |
| if (GET_CODE (bc) != ZERO_EXTEND) |
| return false; |
| bc = XEXP (bc, 0); |
| if (GET_CODE (bc) != REG) |
| return false; |
| if (REGNO (hl) != HL_REG) |
| return false; |
| if (REGNO (bc) != B_REG && REGNO (bc) != C_REG) |
| return false; |
| |
| return true; |
| } |
| |
| #define REG_IS(r, regno) (((r) == (regno)) || ((r) >= FIRST_PSEUDO_REGISTER && !(strict))) |
| |
| /* Return the appropriate mode for a named address address. */ |
| |
| #undef TARGET_ADDR_SPACE_ADDRESS_MODE |
| #define TARGET_ADDR_SPACE_ADDRESS_MODE rl78_addr_space_address_mode |
| |
| static enum machine_mode |
| rl78_addr_space_address_mode (addr_space_t addrspace) |
| { |
| switch (addrspace) |
| { |
| case ADDR_SPACE_GENERIC: |
| return HImode; |
| case ADDR_SPACE_NEAR: |
| return HImode; |
| case ADDR_SPACE_FAR: |
| return SImode; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| /* Used in various constraints and predicates to match operands in the |
| "far" address space. */ |
| int |
| rl78_far_p (rtx x) |
| { |
| if (! MEM_P (x)) |
| return 0; |
| #if DEBUG0 |
| fprintf (stderr, "\033[35mrl78_far_p: "); debug_rtx (x); |
| fprintf (stderr, " = %d\033[0m\n", MEM_ADDR_SPACE (x) == ADDR_SPACE_FAR); |
| #endif |
| |
| /* Not all far addresses are legitimate, because the devirtualizer |
| can't handle them. */ |
| if (! rl78_as_legitimate_address (GET_MODE (x), XEXP (x, 0), false, ADDR_SPACE_FAR)) |
| return 0; |
| |
| return GET_MODE_BITSIZE (rl78_addr_space_address_mode (MEM_ADDR_SPACE (x))) == 32; |
| } |
| |
| /* Return the appropriate mode for a named address pointer. */ |
| #undef TARGET_ADDR_SPACE_POINTER_MODE |
| #define TARGET_ADDR_SPACE_POINTER_MODE rl78_addr_space_pointer_mode |
| |
| static machine_mode |
| rl78_addr_space_pointer_mode (addr_space_t addrspace) |
| { |
| switch (addrspace) |
| { |
| case ADDR_SPACE_GENERIC: |
| return HImode; |
| case ADDR_SPACE_NEAR: |
| return HImode; |
| case ADDR_SPACE_FAR: |
| return SImode; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| /* Returns TRUE for valid addresses. */ |
| #undef TARGET_VALID_POINTER_MODE |
| #define TARGET_VALID_POINTER_MODE rl78_valid_pointer_mode |
| |
| static bool |
| rl78_valid_pointer_mode (machine_mode m) |
| { |
| return (m == HImode || m == SImode); |
| } |
| |
| #undef TARGET_LEGITIMATE_CONSTANT_P |
| #define TARGET_LEGITIMATE_CONSTANT_P rl78_is_legitimate_constant |
| |
| static bool |
| rl78_is_legitimate_constant (machine_mode mode ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED) |
| { |
| return true; |
| } |
| |
| #undef TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P |
| #define TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P rl78_as_legitimate_address |
| |
| bool |
| rl78_as_legitimate_address (machine_mode mode ATTRIBUTE_UNUSED, rtx x, |
| bool strict ATTRIBUTE_UNUSED, addr_space_t as ATTRIBUTE_UNUSED) |
| { |
| rtx base, index, addend; |
| bool is_far_addr = false; |
| int as_bits; |
| |
| as_bits = GET_MODE_BITSIZE (rl78_addr_space_address_mode (as)); |
| |
| if (GET_CODE (x) == UNSPEC |
| && XINT (x, 1) == UNS_ES_ADDR) |
| { |
| x = XVECEXP (x, 0, 1); |
| is_far_addr = true; |
| } |
| |
| if (as_bits == 16 && is_far_addr) |
| return false; |
| |
| if (! characterize_address (x, &base, &index, &addend)) |
| return false; |
| |
| /* We can't extract the high/low portions of a PLUS address |
| involving a register during devirtualization, so make sure all |
| such __far addresses do not have addends. This forces GCC to do |
| the sum separately. */ |
| if (addend && base && as_bits == 32 && GET_MODE (base) == SImode) |
| return false; |
| |
| if (base && index) |
| { |
| int ir = REGNO (index); |
| int br = REGNO (base); |
| |
| #define OK(test, debug) if (test) { /*fprintf(stderr, "%d: OK %s\n", __LINE__, debug);*/ return true; } |
| OK (REG_IS (br, HL_REG) && REG_IS (ir, B_REG), "[hl+b]"); |
| OK (REG_IS (br, HL_REG) && REG_IS (ir, C_REG), "[hl+c]"); |
| return false; |
| } |
| |
| if (strict && base && GET_CODE (base) == REG && REGNO (base) >= FIRST_PSEUDO_REGISTER) |
| return false; |
| |
| if (! cfun->machine->virt_insns_ok && base && GET_CODE (base) == REG |
| && REGNO (base) >= 8 && REGNO (base) <= 31) |
| return false; |
| |
| return true; |
| } |
| |
| /* Determine if one named address space is a subset of another. */ |
| #undef TARGET_ADDR_SPACE_SUBSET_P |
| #define TARGET_ADDR_SPACE_SUBSET_P rl78_addr_space_subset_p |
| |
| static bool |
| rl78_addr_space_subset_p (addr_space_t subset, addr_space_t superset) |
| { |
| int subset_bits; |
| int superset_bits; |
| |
| subset_bits = GET_MODE_BITSIZE (rl78_addr_space_address_mode (subset)); |
| superset_bits = GET_MODE_BITSIZE (rl78_addr_space_address_mode (superset)); |
| |
| return (subset_bits <= superset_bits); |
| } |
| |
| #undef TARGET_ADDR_SPACE_CONVERT |
| #define TARGET_ADDR_SPACE_CONVERT rl78_addr_space_convert |
| |
| /* Convert from one address space to another. */ |
| static rtx |
| rl78_addr_space_convert (rtx op, tree from_type, tree to_type) |
| { |
| addr_space_t from_as = TYPE_ADDR_SPACE (TREE_TYPE (from_type)); |
| addr_space_t to_as = TYPE_ADDR_SPACE (TREE_TYPE (to_type)); |
| rtx result; |
| int to_bits; |
| int from_bits; |
| |
| to_bits = GET_MODE_BITSIZE (rl78_addr_space_address_mode (to_as)); |
| from_bits = GET_MODE_BITSIZE (rl78_addr_space_address_mode (from_as)); |
| |
| if (to_bits < from_bits) |
| { |
| rtx tmp; |
| /* This is unpredictable, as we're truncating off usable address |
| bits. */ |
| |
| warning (OPT_Waddress, "converting far pointer to near pointer"); |
| result = gen_reg_rtx (HImode); |
| if (GET_CODE (op) == SYMBOL_REF |
| || (GET_CODE (op) == REG && REGNO (op) >= FIRST_PSEUDO_REGISTER)) |
| tmp = gen_rtx_raw_SUBREG (HImode, op, 0); |
| else |
| tmp = simplify_subreg (HImode, op, SImode, 0); |
| gcc_assert (tmp != NULL_RTX); |
| emit_move_insn (result, tmp); |
| return result; |
| } |
| else if (to_bits > from_bits) |
| { |
| /* This always works. */ |
| result = gen_reg_rtx (SImode); |
| emit_move_insn (rl78_subreg (HImode, result, SImode, 0), op); |
| if (TREE_CODE (from_type) == POINTER_TYPE |
| && TREE_CODE (TREE_TYPE (from_type)) == FUNCTION_TYPE) |
| emit_move_insn (rl78_subreg (HImode, result, SImode, 2), const0_rtx); |
| else |
| emit_move_insn (rl78_subreg (HImode, result, SImode, 2), GEN_INT (0x0f)); |
| return result; |
| } |
| else |
| return op; |
| gcc_unreachable (); |
| } |
| |
| /* Implements REGNO_MODE_CODE_OK_FOR_BASE_P. */ |
| bool |
| rl78_regno_mode_code_ok_for_base_p (int regno, machine_mode mode ATTRIBUTE_UNUSED, |
| addr_space_t address_space ATTRIBUTE_UNUSED, |
| int outer_code ATTRIBUTE_UNUSED, int index_code) |
| { |
| if (regno <= SP_REG && regno >= 16) |
| return true; |
| if (index_code == REG) |
| return (regno == HL_REG); |
| if (regno == C_REG || regno == B_REG || regno == E_REG || regno == L_REG) |
| return true; |
| return false; |
| } |
| |
| /* Implements MODE_CODE_BASE_REG_CLASS. */ |
| enum reg_class |
| rl78_mode_code_base_reg_class (machine_mode mode ATTRIBUTE_UNUSED, |
| addr_space_t address_space ATTRIBUTE_UNUSED, |
| int outer_code ATTRIBUTE_UNUSED, |
| int index_code ATTRIBUTE_UNUSED) |
| { |
| return V_REGS; |
| } |
| |
| /* Typical stack layout should looks like this after the function's prologue: |
| |
| | | |
| -- ^ |
| | | \ | |
| | | arguments saved | Increasing |
| | | on the stack | addresses |
| PARENT arg pointer -> | | / |
| -------------------------- ---- ------------------- |
| CHILD |ret | return address |
| -- |
| | | \ |
| | | call saved |
| | | registers |
| frame pointer -> | | / |
| -- |
| | | \ |
| | | local |
| | | variables |
| | | / |
| -- |
| | | \ |
| | | outgoing | Decreasing |
| | | arguments | addresses |
| current stack pointer -> | | / | |
| -------------------------- ---- ------------------ V |
| | | */ |
| |
| /* Implements INITIAL_ELIMINATION_OFFSET. The frame layout is |
| described in the machine_Function struct definition, above. */ |
| int |
| rl78_initial_elimination_offset (int from, int to) |
| { |
| int rv = 0; /* as if arg to arg */ |
| |
| rl78_compute_frame_info (); |
| |
| switch (to) |
| { |
| case STACK_POINTER_REGNUM: |
| rv += cfun->machine->framesize_outgoing; |
| rv += cfun->machine->framesize_locals; |
| /* Fall through. */ |
| case FRAME_POINTER_REGNUM: |
| rv += cfun->machine->framesize_regs; |
| rv += 4; |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| switch (from) |
| { |
| case FRAME_POINTER_REGNUM: |
| rv -= 4; |
| rv -= cfun->machine->framesize_regs; |
| case ARG_POINTER_REGNUM: |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| return rv; |
| } |
| |
| static int |
| rl78_is_naked_func (void) |
| { |
| return (lookup_attribute ("naked", DECL_ATTRIBUTES (current_function_decl)) != NULL_TREE); |
| } |
| |
| /* Expand the function prologue (from the prologue pattern). */ |
| void |
| rl78_expand_prologue (void) |
| { |
| int i, fs; |
| rtx sp = gen_rtx_REG (HImode, STACK_POINTER_REGNUM); |
| rtx ax = gen_rtx_REG (HImode, AX_REG); |
| int rb = 0; |
| |
| if (rl78_is_naked_func ()) |
| return; |
| |
| /* Always re-compute the frame info - the register usage may have changed. */ |
| rl78_compute_frame_info (); |
| |
| if (flag_stack_usage_info) |
| current_function_static_stack_size = cfun->machine->framesize; |
| |
| if (is_interrupt_func (cfun->decl) && !TARGET_G10) |
| for (i = 0; i < 4; i++) |
| if (cfun->machine->need_to_push [i]) |
| { |
| /* Select Bank 0 if we are using any registers from Bank 0. */ |
| emit_insn (gen_sel_rb (GEN_INT (0))); |
| break; |
| } |
| |
| for (i = 0; i < 16; i++) |
| if (cfun->machine->need_to_push [i]) |
| { |
| int reg = i * 2; |
| |
| if (TARGET_G10) |
| { |
| if (reg >= 8) |
| { |
| emit_move_insn (ax, gen_rtx_REG (HImode, reg)); |
| reg = AX_REG; |
| } |
| } |
| else |
| { |
| int need_bank = i/4; |
| |
| if (need_bank != rb) |
| { |
| emit_insn (gen_sel_rb (GEN_INT (need_bank))); |
| rb = need_bank; |
| } |
| } |
| |
| F (emit_insn (gen_push (gen_rtx_REG (HImode, reg)))); |
| } |
| |
| if (rb != 0) |
| emit_insn (gen_sel_rb (GEN_INT (0))); |
| |
| /* Save ES register inside interrupt functions if it is used. */ |
| if (is_interrupt_func (cfun->decl) && cfun->machine->uses_es) |
| { |
| emit_insn (gen_movqi_from_es (gen_rtx_REG (QImode, A_REG))); |
| F (emit_insn (gen_push (ax))); |
| } |
| |
| if (frame_pointer_needed) |
| { |
| F (emit_move_insn (ax, sp)); |
| F (emit_move_insn (gen_rtx_REG (HImode, FRAME_POINTER_REGNUM), ax)); |
| } |
| |
| fs = cfun->machine->framesize_locals + cfun->machine->framesize_outgoing; |
| if (fs > 0) |
| { |
| /* If we need to subtract more than 254*3 then it is faster and |
| smaller to move SP into AX and perform the subtraction there. */ |
| if (fs > 254 * 3) |
| { |
| rtx insn; |
| |
| emit_move_insn (ax, sp); |
| emit_insn (gen_subhi3 (ax, ax, GEN_INT (fs))); |
| insn = emit_move_insn (sp, ax); |
| add_reg_note (insn, REG_FRAME_RELATED_EXPR, |
| gen_rtx_SET (SImode, sp, |
| gen_rtx_PLUS (HImode, sp, GEN_INT (-fs)))); |
| } |
| else |
| { |
| while (fs > 0) |
| { |
| int fs_byte = (fs > 254) ? 254 : fs; |
| |
| F (emit_insn (gen_subhi3 (sp, sp, GEN_INT (fs_byte)))); |
| fs -= fs_byte; |
| } |
| } |
| } |
| } |
| |
| /* Expand the function epilogue (from the epilogue pattern). */ |
| void |
| rl78_expand_epilogue (void) |
| { |
| int i, fs; |
| rtx sp = gen_rtx_REG (HImode, STACK_POINTER_REGNUM); |
| rtx ax = gen_rtx_REG (HImode, AX_REG); |
| int rb = 0; |
| |
| if (rl78_is_naked_func ()) |
| return; |
| |
| if (frame_pointer_needed) |
| { |
| emit_move_insn (ax, gen_rtx_REG (HImode, FRAME_POINTER_REGNUM)); |
| emit_move_insn (sp, ax); |
| } |
| else |
| { |
| fs = cfun->machine->framesize_locals + cfun->machine->framesize_outgoing; |
| if (fs > 254 * 3) |
| { |
| emit_move_insn (ax, sp); |
| emit_insn (gen_addhi3 (ax, ax, GEN_INT (fs))); |
| emit_move_insn (sp, ax); |
| } |
| else |
| { |
| while (fs > 0) |
| { |
| int fs_byte = (fs > 254) ? 254 : fs; |
| |
| emit_insn (gen_addhi3 (sp, sp, GEN_INT (fs_byte))); |
| fs -= fs_byte; |
| } |
| } |
| } |
| |
| if (is_interrupt_func (cfun->decl) && cfun->machine->uses_es) |
| { |
| emit_insn (gen_pop (gen_rtx_REG (HImode, AX_REG))); |
| emit_insn (gen_movqi_to_es (gen_rtx_REG (QImode, A_REG))); |
| } |
| |
| for (i = 15; i >= 0; i--) |
| if (cfun->machine->need_to_push [i]) |
| { |
| rtx dest = gen_rtx_REG (HImode, i * 2); |
| |
| if (TARGET_G10) |
| { |
| if (i < 8) |
| emit_insn (gen_pop (dest)); |
| else |
| { |
| emit_insn (gen_pop (ax)); |
| emit_move_insn (dest, ax); |
| /* Generate a USE of the pop'd register so that DCE will not eliminate the move. */ |
| emit_insn (gen_use (dest)); |
| } |
| } |
| else |
| { |
| int need_bank = i / 4; |
| |
| if (need_bank != rb) |
| { |
| emit_insn (gen_sel_rb (GEN_INT (need_bank))); |
| rb = need_bank; |
| } |
| emit_insn (gen_pop (dest)); |
| } |
| } |
| |
| if (rb != 0) |
| emit_insn (gen_sel_rb (GEN_INT (0))); |
| |
| if (cfun->machine->trampolines_used) |
| emit_insn (gen_trampoline_uninit ()); |
| |
| if (is_brk_interrupt_func (cfun->decl)) |
| emit_jump_insn (gen_brk_interrupt_return ()); |
| else if (is_interrupt_func (cfun->decl)) |
| emit_jump_insn (gen_interrupt_return ()); |
| else |
| emit_jump_insn (gen_rl78_return ()); |
| } |
| |
| /* Likewise, for exception handlers. */ |
| void |
| rl78_expand_eh_epilogue (rtx x ATTRIBUTE_UNUSED) |
| { |
| /* FIXME - replace this with an indirect jump with stack adjust. */ |
| emit_jump_insn (gen_rl78_return ()); |
| } |
| |
| #undef TARGET_ASM_FUNCTION_PROLOGUE |
| #define TARGET_ASM_FUNCTION_PROLOGUE rl78_start_function |
| |
| /* We don't use this to actually emit the function prologue. We use |
| this to insert a comment in the asm file describing the |
| function. */ |
| static void |
| rl78_start_function (FILE *file, HOST_WIDE_INT hwi_local ATTRIBUTE_UNUSED) |
| { |
| int i; |
| |
| if (cfun->machine->framesize == 0) |
| return; |
| fprintf (file, "\t; start of function\n"); |
| |
| if (cfun->machine->framesize_regs) |
| { |
| fprintf (file, "\t; push %d:", cfun->machine->framesize_regs); |
| for (i = 0; i < 16; i ++) |
| if (cfun->machine->need_to_push[i]) |
| fprintf (file, " %s", word_regnames[i*2]); |
| fprintf (file, "\n"); |
| } |
| |
| if (frame_pointer_needed) |
| fprintf (file, "\t; $fp points here (r22)\n"); |
| |
| if (cfun->machine->framesize_locals) |
| fprintf (file, "\t; locals: %d byte%s\n", cfun->machine->framesize_locals, |
| cfun->machine->framesize_locals == 1 ? "" : "s"); |
| |
| if (cfun->machine->framesize_outgoing) |
| fprintf (file, "\t; outgoing: %d byte%s\n", cfun->machine->framesize_outgoing, |
| cfun->machine->framesize_outgoing == 1 ? "" : "s"); |
| |
| if (cfun->machine->uses_es) |
| fprintf (file, "\t; uses ES register\n"); |
| } |
| |
| /* Return an RTL describing where a function return value of type RET_TYPE |
| is held. */ |
| |
| #undef TARGET_FUNCTION_VALUE |
| #define TARGET_FUNCTION_VALUE rl78_function_value |
| |
| static rtx |
| rl78_function_value (const_tree ret_type, |
| const_tree fn_decl_or_type ATTRIBUTE_UNUSED, |
| bool outgoing ATTRIBUTE_UNUSED) |
| { |
| machine_mode mode = TYPE_MODE (ret_type); |
| |
| return gen_rtx_REG (mode, 8); |
| } |
| |
| #undef TARGET_PROMOTE_FUNCTION_MODE |
| #define TARGET_PROMOTE_FUNCTION_MODE rl78_promote_function_mode |
| |
| static machine_mode |
| rl78_promote_function_mode (const_tree type ATTRIBUTE_UNUSED, |
| machine_mode mode, |
| int *punsignedp ATTRIBUTE_UNUSED, |
| const_tree funtype ATTRIBUTE_UNUSED, int for_return ATTRIBUTE_UNUSED) |
| { |
| return mode; |
| } |
| |
| /* Return an RTL expression describing the register holding a function |
| parameter of mode MODE and type TYPE or NULL_RTX if the parameter should |
| be passed on the stack. CUM describes the previous parameters to the |
| function and NAMED is false if the parameter is part of a variable |
| parameter list, or the last named parameter before the start of a |
| variable parameter list. */ |
| |
| #undef TARGET_FUNCTION_ARG |
| #define TARGET_FUNCTION_ARG rl78_function_arg |
| |
| static rtx |
| rl78_function_arg (cumulative_args_t cum_v ATTRIBUTE_UNUSED, |
| machine_mode mode ATTRIBUTE_UNUSED, |
| const_tree type ATTRIBUTE_UNUSED, |
| bool named ATTRIBUTE_UNUSED) |
| { |
| return NULL_RTX; |
| } |
| |
| #undef TARGET_FUNCTION_ARG_ADVANCE |
| #define TARGET_FUNCTION_ARG_ADVANCE rl78_function_arg_advance |
| |
| static void |
| rl78_function_arg_advance (cumulative_args_t cum_v, machine_mode mode, const_tree type, |
| bool named ATTRIBUTE_UNUSED) |
| { |
| int rounded_size; |
| CUMULATIVE_ARGS * cum = get_cumulative_args (cum_v); |
| |
| rounded_size = ((mode == BLKmode) |
| ? int_size_in_bytes (type) : GET_MODE_SIZE (mode)); |
| if (rounded_size & 1) |
| rounded_size ++; |
| (*cum) += rounded_size; |
| } |
| |
| #undef TARGET_FUNCTION_ARG_BOUNDARY |
| #define TARGET_FUNCTION_ARG_BOUNDARY rl78_function_arg_boundary |
| |
| static unsigned int |
| rl78_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED, |
| const_tree type ATTRIBUTE_UNUSED) |
| { |
| return 16; |
| } |
| |
| /* Supported modifier letters: |
| |
| A - address of a MEM |
| S - SADDR form of a real register |
| v - real register corresponding to a virtual register |
| m - minus - negative of CONST_INT value. |
| C - inverse of a conditional (NE vs EQ for example) |
| C - complement of an integer |
| z - collapsed conditional |
| s - shift count mod 8 |
| S - shift count mod 16 |
| r - reverse shift count (8-(count mod 8)) |
| B - bit position |
| |
| h - bottom HI of an SI |
| H - top HI of an SI |
| q - bottom QI of an HI |
| Q - top QI of an HI |
| e - third QI of an SI (i.e. where the ES register gets values from) |
| E - fourth QI of an SI (i.e. MSB) |
| |
| */ |
| |
| /* Implements the bulk of rl78_print_operand, below. We do it this |
| way because we need to test for a constant at the top level and |
| insert the '#', but not test for it anywhere else as we recurse |
| down into the operand. */ |
| static void |
| rl78_print_operand_1 (FILE * file, rtx op, int letter) |
| { |
| int need_paren; |
| |
| switch (GET_CODE (op)) |
| { |
| case MEM: |
| if (letter == 'A') |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| else |
| { |
| if (rl78_far_p (op)) |
| { |
| fprintf (file, "es:"); |
| if (GET_CODE (XEXP (op, 0)) == UNSPEC) |
| op = gen_rtx_MEM (GET_MODE (op), XVECEXP (XEXP (op, 0), 0, 1)); |
| } |
| if (letter == 'H') |
| { |
| op = adjust_address (op, HImode, 2); |
| letter = 0; |
| } |
| if (letter == 'h') |
| { |
| op = adjust_address (op, HImode, 0); |
| letter = 0; |
| } |
| if (letter == 'Q') |
| { |
| op = adjust_address (op, QImode, 1); |
| letter = 0; |
| } |
| if (letter == 'q') |
| { |
| op = adjust_address (op, QImode, 0); |
| letter = 0; |
| } |
| if (letter == 'e') |
| { |
| op = adjust_address (op, QImode, 2); |
| letter = 0; |
| } |
| if (letter == 'E') |
| { |
| op = adjust_address (op, QImode, 3); |
| letter = 0; |
| } |
| if (CONSTANT_P (XEXP (op, 0))) |
| { |
| if (!rl78_saddr_p (op)) |
| fprintf (file, "!"); |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| } |
| else if (GET_CODE (XEXP (op, 0)) == PLUS |
| && GET_CODE (XEXP (XEXP (op, 0), 0)) == SYMBOL_REF) |
| { |
| if (!rl78_saddr_p (op)) |
| fprintf (file, "!"); |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| } |
| else if (GET_CODE (XEXP (op, 0)) == PLUS |
| && GET_CODE (XEXP (XEXP (op, 0), 0)) == REG |
| && REGNO (XEXP (XEXP (op, 0), 0)) == 2) |
| { |
| rl78_print_operand_1 (file, XEXP (XEXP (op, 0), 1), 'u'); |
| fprintf (file, "["); |
| rl78_print_operand_1 (file, XEXP (XEXP (op, 0), 0), 0); |
| fprintf (file, "]"); |
| } |
| else |
| { |
| fprintf (file, "["); |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| if (letter == 'p' && GET_CODE (XEXP (op, 0)) == REG) |
| fprintf (file, "+0"); |
| fprintf (file, "]"); |
| } |
| } |
| break; |
| |
| case REG: |
| if (letter == 'Q') |
| fprintf (file, "%s", reg_names [REGNO (op) | 1]); |
| else if (letter == 'H') |
| fprintf (file, "%s", reg_names [REGNO (op) + 2]); |
| else if (letter == 'q') |
| fprintf (file, "%s", reg_names [REGNO (op) & ~1]); |
| else if (letter == 'e') |
| fprintf (file, "%s", reg_names [REGNO (op) + 2]); |
| else if (letter == 'E') |
| fprintf (file, "%s", reg_names [REGNO (op) + 3]); |
| else if (letter == 'S') |
| fprintf (file, "0x%x", 0xffef8 + REGNO (op)); |
| else if (GET_MODE (op) == HImode |
| && ! (REGNO (op) & ~0xfe)) |
| { |
| if (letter == 'v') |
| fprintf (file, "%s", word_regnames [REGNO (op) % 8]); |
| else |
| fprintf (file, "%s", word_regnames [REGNO (op)]); |
| } |
| else |
| fprintf (file, "%s", reg_names [REGNO (op)]); |
| break; |
| |
| case CONST_INT: |
| if (letter == 'Q') |
| fprintf (file, "%ld", INTVAL (op) >> 8); |
| else if (letter == 'H') |
| fprintf (file, "%ld", INTVAL (op) >> 16); |
| else if (letter == 'q') |
| fprintf (file, "%ld", INTVAL (op) & 0xff); |
| else if (letter == 'h') |
| fprintf (file, "%ld", INTVAL (op) & 0xffff); |
| else if (letter == 'e') |
| fprintf (file, "%ld", (INTVAL (op) >> 16) & 0xff); |
| else if (letter == 'B') |
| { |
| int ival = INTVAL (op); |
| if (ival == -128) |
| ival = 0x80; |
| if (exact_log2 (ival) >= 0) |
| fprintf (file, "%d", exact_log2 (ival)); |
| else |
| fprintf (file, "%d", exact_log2 (~ival & 0xff)); |
| } |
| else if (letter == 'E') |
| fprintf (file, "%ld", (INTVAL (op) >> 24) & 0xff); |
| else if (letter == 'm') |
| fprintf (file, "%ld", - INTVAL (op)); |
| else if (letter == 's') |
| fprintf (file, "%ld", INTVAL (op) % 8); |
| else if (letter == 'S') |
| fprintf (file, "%ld", INTVAL (op) % 16); |
| else if (letter == 'r') |
| fprintf (file, "%ld", 8 - (INTVAL (op) % 8)); |
| else if (letter == 'C') |
| fprintf (file, "%ld", (INTVAL (op) ^ 0x8000) & 0xffff); |
| else |
| fprintf (file, "%ld", INTVAL (op)); |
| break; |
| |
| case CONST: |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| break; |
| |
| case ZERO_EXTRACT: |
| { |
| int bits = INTVAL (XEXP (op, 1)); |
| int ofs = INTVAL (XEXP (op, 2)); |
| if (bits == 16 && ofs == 0) |
| fprintf (file, "%%lo16("); |
| else if (bits == 16 && ofs == 16) |
| fprintf (file, "%%hi16("); |
| else if (bits == 8 && ofs == 16) |
| fprintf (file, "%%hi8("); |
| else |
| gcc_unreachable (); |
| rl78_print_operand_1 (file, XEXP (op, 0), 0); |
| fprintf (file, ")"); |
| } |
| break; |
| |
| case ZERO_EXTEND: |
| if (GET_CODE (XEXP (op, 0)) == REG) |
| fprintf (file, "%s", reg_names [REGNO (XEXP (op, 0))]); |
| else |
| print_rtl (file, op); |
| break; |
| |
| case PLUS: |
| need_paren = 0; |
| if (letter == 'H') |
| { |
| fprintf (file, "%%hi16("); |
| need_paren = 1; |
| letter = 0; |
| } |
| if (letter == 'h') |
| { |
| fprintf (file, "%%lo16("); |
| need_paren = 1; |
| letter = 0; |
| } |
| if (letter == 'e') |
| { |
| fprintf (file, "%%hi8("); |
| need_paren = 1; |
| letter = 0; |
| } |
| if (letter == 'q' || letter == 'Q') |
| output_operand_lossage ("q/Q modifiers invalid for symbol references"); |
| |
| if (GET_CODE (XEXP (op, 0)) == ZERO_EXTEND) |
| { |
| rl78_print_operand_1 (file, XEXP (op, 1), letter); |
| fprintf (file, "+"); |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| } |
| else |
| { |
| rl78_print_operand_1 (file, XEXP (op, 0), letter); |
| fprintf (file, "+"); |
| rl78_print_operand_1 (file, XEXP (op, 1), letter); |
| } |
| if (need_paren) |
| fprintf (file, ")"); |
| break; |
| |
| case SUBREG: |
| if (GET_MODE (op) == HImode |
| && SUBREG_BYTE (op) == 0) |
| { |
| fprintf (file, "%%lo16("); |
| rl78_print_operand_1 (file, SUBREG_REG (op), 0); |
| fprintf (file, ")"); |
| } |
| else if (GET_MODE (op) == HImode |
| && SUBREG_BYTE (op) == 2) |
| { |
| fprintf (file, "%%hi16("); |
| rl78_print_operand_1 (file, SUBREG_REG (op), 0); |
| fprintf (file, ")"); |
| } |
| else |
| { |
| fprintf (file, "(%s)", GET_RTX_NAME (GET_CODE (op))); |
| } |
| break; |
| |
| case SYMBOL_REF: |
| need_paren = 0; |
| if (letter == 'H') |
| { |
| fprintf (file, "%%hi16("); |
| need_paren = 1; |
| letter = 0; |
| } |
| if (letter == 'h') |
| { |
| fprintf (file, "%%lo16("); |
| need_paren = 1; |
| letter = 0; |
| } |
| if (letter == 'e') |
| { |
| fprintf (file, "%%hi8("); |
| need_paren = 1; |
| letter = 0; |
| } |
| if (letter == 'q' || letter == 'Q') |
| output_operand_lossage ("q/Q modifiers invalid for symbol references"); |
| |
| if (SYMBOL_REF_DECL (op) && TREE_CODE (SYMBOL_REF_DECL (op)) == FUNCTION_DECL) |
| { |
| fprintf (file, "%%code("); |
| assemble_name (file, rl78_strip_nonasm_name_encoding (XSTR (op, 0))); |
| fprintf (file, ")"); |
| } |
| else |
| assemble_name (file, rl78_strip_nonasm_name_encoding (XSTR (op, 0))); |
| if (need_paren) |
| fprintf (file, ")"); |
| break; |
| |
| case CODE_LABEL: |
| case LABEL_REF: |
| output_asm_label (op); |
| break; |
| |
| case LTU: |
| if (letter == 'z') |
| fprintf (file, "#comparison eliminated"); |
| else |
| fprintf (file, letter == 'C' ? "nc" : "c"); |
| break; |
| case LEU: |
| if (letter == 'z') |
| fprintf (file, "br"); |
| else |
| fprintf (file, letter == 'C' ? "h" : "nh"); |
| break; |
| case GEU: |
| if (letter == 'z') |
| fprintf (file, "br"); |
| else |
| fprintf (file, letter == 'C' ? "c" : "nc"); |
| break; |
| case GTU: |
| if (letter == 'z') |
| fprintf (file, "#comparison eliminated"); |
| else |
| fprintf (file, letter == 'C' ? "nh" : "h"); |
| break; |
| case EQ: |
| if (letter == 'z') |
| fprintf (file, "br"); |
| else |
| fprintf (file, letter == 'C' ? "nz" : "z"); |
| break; |
| case NE: |
| if (letter == 'z') |
| fprintf (file, "#comparison eliminated"); |
| else |
| fprintf (file, letter == 'C' ? "z" : "nz"); |
| break; |
| |
| /* Note: these assume appropriate adjustments were made so that |
| unsigned comparisons, which is all this chip has, will |
| work. */ |
| case LT: |
| if (letter == 'z') |
| fprintf (file, "#comparison eliminated"); |
| else |
| fprintf (file, letter == 'C' ? "nc" : "c"); |
| break; |
| case LE: |
| if (letter == 'z') |
| fprintf (file, "br"); |
| else |
| fprintf (file, letter == 'C' ? "h" : "nh"); |
| break; |
| case GE: |
| if (letter == 'z') |
| fprintf (file, "br"); |
| else |
| fprintf (file, letter == 'C' ? "c" : "nc"); |
| break; |
| case GT: |
| if (letter == 'z') |
| fprintf (file, "#comparison eliminated"); |
| else |
| fprintf (file, letter == 'C' ? "nh" : "h"); |
| break; |
| |
| default: |
| fprintf (file, "(%s)", GET_RTX_NAME (GET_CODE (op))); |
| break; |
| } |
| } |
| |
| #undef TARGET_PRINT_OPERAND |
| #define TARGET_PRINT_OPERAND rl78_print_operand |
| |
| static void |
| rl78_print_operand (FILE * file, rtx op, int letter) |
| { |
| if (CONSTANT_P (op) && letter != 'u' && letter != 's' && letter != 'r' && letter != 'S' && letter != 'B') |
| fprintf (file, "#"); |
| rl78_print_operand_1 (file, op, letter); |
| } |
| |
| #undef TARGET_TRAMPOLINE_INIT |
| #define TARGET_TRAMPOLINE_INIT rl78_trampoline_init |
| |
| /* Note that the RL78's addressing makes it very difficult to do |
| trampolines on the stack. So, libgcc has a small pool of |
| trampolines from which one is allocated to this task. */ |
| static void |
| rl78_trampoline_init (rtx m_tramp, tree fndecl, rtx static_chain) |
| { |
| rtx mov_addr, thunk_addr; |
| rtx function = XEXP (DECL_RTL (fndecl), 0); |
| |
| mov_addr = adjust_address (m_tramp, HImode, 0); |
| thunk_addr = gen_reg_rtx (HImode); |
| |
| function = force_reg (HImode, function); |
| static_chain = force_reg (HImode, static_chain); |
| |
| emit_insn (gen_trampoline_init (thunk_addr, function, static_chain)); |
| emit_move_insn (mov_addr, thunk_addr); |
| |
| cfun->machine->trampolines_used = 1; |
| } |
| |
| #undef TARGET_TRAMPOLINE_ADJUST_ADDRESS |
| #define TARGET_TRAMPOLINE_ADJUST_ADDRESS rl78_trampoline_adjust_address |
| |
| static rtx |
| rl78_trampoline_adjust_address (rtx m_tramp) |
| { |
| rtx x = gen_rtx_MEM (HImode, m_tramp); |
| return x; |
| } |
| |
| /* Expander for cbranchqi4 and cbranchhi4. RL78 is missing some of |
| the "normal" compares, specifically, it only has unsigned compares, |
| so we must synthesize the missing ones. */ |
| void |
| rl78_expand_compare (rtx *operands) |
| { |
| if (GET_CODE (operands[2]) == MEM) |
| operands[2] = copy_to_mode_reg (GET_MODE (operands[2]), operands[2]); |
| } |
| |
| |
| |
| /* Define this to 1 if you are debugging the peephole optimizers. */ |
| #define DEBUG_PEEP 0 |
| |
| /* Predicate used to enable the peephole2 patterns in rl78-virt.md. |
| The default "word" size is a byte so we can effectively use all the |
| registers, but we want to do 16-bit moves whenever possible. This |
| function determines when such a move is an option. */ |
| bool |
| rl78_peep_movhi_p (rtx *operands) |
| { |
| int i; |
| rtx m, a; |
| |
| /* (set (op0) (op1)) |
| (set (op2) (op3)) */ |
| |
| if (! rl78_virt_insns_ok ()) |
| return false; |
| |
| #if DEBUG_PEEP |
| fprintf (stderr, "\033[33m"); |
| debug_rtx (operands[0]); |
| debug_rtx (operands[1]); |
| debug_rtx (operands[2]); |
| debug_rtx (operands[3]); |
| fprintf (stderr, "\033[0m"); |
| #endif |
| |
| /* You can move a constant to memory as QImode, but not HImode. */ |
| if (GET_CODE (operands[0]) == MEM |
| && GET_CODE (operands[1]) != REG) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: move constant to memory\n"); |
| #endif |
| return false; |
| } |
| |
| if (rtx_equal_p (operands[0], operands[3])) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: overlapping\n"); |
| #endif |
| return false; |
| } |
| |
| for (i = 0; i < 2; i ++) |
| { |
| if (GET_CODE (operands[i]) != GET_CODE (operands[i+2])) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: different codes\n"); |
| #endif |
| return false; |
| } |
| if (GET_MODE (operands[i]) != GET_MODE (operands[i+2])) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: different modes\n"); |
| #endif |
| return false; |
| } |
| |
| switch (GET_CODE (operands[i])) |
| { |
| case REG: |
| /* LSB MSB */ |
| if (REGNO (operands[i]) + 1 != REGNO (operands[i+2]) |
| || GET_MODE (operands[i]) != QImode) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: wrong regnos %d %d %d\n", |
| REGNO (operands[i]), REGNO (operands[i+2]), |
| i); |
| #endif |
| return false; |
| } |
| if (! rl78_hard_regno_mode_ok (REGNO (operands[i]), HImode)) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: reg %d not HI\n", REGNO (operands[i])); |
| #endif |
| return false; |
| } |
| break; |
| |
| case CONST_INT: |
| break; |
| |
| case MEM: |
| if (GET_MODE (operands[i]) != QImode) |
| return false; |
| if (MEM_ALIGN (operands[i]) < 16) |
| return false; |
| a = XEXP (operands[i], 0); |
| if (GET_CODE (a) == CONST) |
| a = XEXP (a, 0); |
| if (GET_CODE (a) == PLUS) |
| a = XEXP (a, 1); |
| if (GET_CODE (a) == CONST_INT |
| && INTVAL (a) & 1) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: misaligned mem %d\n", i); |
| debug_rtx (operands[i]); |
| #endif |
| return false; |
| } |
| m = adjust_address (operands[i], QImode, 1); |
| if (! rtx_equal_p (m, operands[i+2])) |
| { |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: wrong mem %d\n", i); |
| debug_rtx (m); |
| debug_rtx (operands[i+2]); |
| #endif |
| return false; |
| } |
| break; |
| |
| default: |
| #if DEBUG_PEEP |
| fprintf (stderr, "no peep: wrong rtx %d\n", i); |
| #endif |
| return false; |
| } |
| } |
| #if DEBUG_PEEP |
| fprintf (stderr, "\033[32mpeep!\033[0m\n"); |
| #endif |
| return true; |
| } |
| |
| /* Likewise, when a peephole is activated, this function helps compute |
| the new operands. */ |
| void |
| rl78_setup_peep_movhi (rtx *operands) |
| { |
| int i; |
| |
| for (i = 0; i < 2; i ++) |
| { |
| switch (GET_CODE (operands[i])) |
| { |
| case REG: |
| operands[i+4] = gen_rtx_REG (HImode, REGNO (operands[i])); |
| break; |
| |
| case CONST_INT: |
| operands[i+4] = GEN_INT ((INTVAL (operands[i]) & 0xff) + ((char) INTVAL (operands[i+2])) * 256); |
| break; |
| |
| case MEM: |
| operands[i+4] = adjust_address (operands[i], HImode, 0); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| } |
| |
| /* |
| How Devirtualization works in the RL78 GCC port |
| |
| Background |
| |
| The RL78 is an 8-bit port with some 16-bit operations. It has 32 |
| bytes of register space, in four banks, memory-mapped. One bank is |
| the "selected" bank and holds the registers used for primary |
| operations. Since the registers are memory mapped, often you can |
| still refer to the unselected banks via memory accesses. |
| |
| Virtual Registers |
| |
| The GCC port uses bank 0 as the "selected" registers (A, X, BC, etc) |
| and refers to the other banks via their memory addresses, although |
| they're treated as regular registers internally. These "virtual" |
| registers are R8 through R23 (bank3 is reserved for asm-based |
| interrupt handlers). |
| |
| There are four machine description files: |
| |
| rl78.md - common register-independent patterns and definitions |
| rl78-expand.md - expanders |
| rl78-virt.md - patterns that match BEFORE devirtualization |
| rl78-real.md - patterns that match AFTER devirtualization |
| |
| At least through register allocation and reload, gcc is told that it |
| can do pretty much anything - but may only use the virtual registers. |
| GCC cannot properly create the varying addressing modes that the RL78 |
| supports in an efficient way. |
| |
| Sometime after reload, the RL78 backend "devirtualizes" the RTL. It |
| uses the "valloc" attribute in rl78-virt.md for determining the rules |
| by which it will replace virtual registers with real registers (or |
| not) and how to make up addressing modes. For example, insns tagged |
| with "ro1" have a single read-only parameter, which may need to be |
| moved from memory/constant/vreg to a suitable real register. As part |
| of devirtualization, a flag is toggled, disabling the rl78-virt.md |
| patterns and enabling the rl78-real.md patterns. The new patterns' |
| constraints are used to determine the real registers used. NOTE: |
| patterns in rl78-virt.md essentially ignore the constrains and rely on |
| predicates, where the rl78-real.md ones essentially ignore the |
| predicates and rely on the constraints. |
| |
| The devirtualization pass is scheduled via the pass manager (despite |
| being called "rl78_reorg") so it can be scheduled prior to var-track |
| (the idea is to let gdb know about the new registers). Ideally, it |
| would be scheduled right after pro/epilogue generation, so the |
| post-reload optimizers could operate on the real registers, but when I |
| tried that there were some issues building the target libraries. |
| |
| During devirtualization, a simple register move optimizer is run. It |
| would be better to run a full CSE/propogation pass on it though, but |
| that has not yet been attempted. |
| |
| */ |
| #define DEBUG_ALLOC 0 |
| |
| #define OP(x) (*recog_data.operand_loc[x]) |
| |
| /* This array is used to hold knowledge about the contents of the |
| real registers (A ... H), the memory-based registers (r8 ... r31) |
| and the first NUM_STACK_LOCS words on the stack. We use this to |
| avoid generating redundant move instructions. |
| |
| A value in the range 0 .. 31 indicates register A .. r31. |
| A value in the range 32 .. 63 indicates stack slot (value - 32). |
| A value of NOT_KNOWN indicates that the contents of that location |
| are not known. */ |
| |
| #define NUM_STACK_LOCS 32 |
| #define NOT_KNOWN 127 |
| |
| static unsigned char content_memory [32 + NUM_STACK_LOCS]; |
| |
| static unsigned char saved_update_index = NOT_KNOWN; |
| static unsigned char saved_update_value; |
| static machine_mode saved_update_mode; |
| |
| |
| static inline void |
| clear_content_memory (void) |
| { |
| memset (content_memory, NOT_KNOWN, sizeof content_memory); |
| if (dump_file) |
| fprintf (dump_file, " clear content memory\n"); |
| saved_update_index = NOT_KNOWN; |
| } |
| |
| /* Convert LOC into an index into the content_memory array. |
| If LOC cannot be converted, return NOT_KNOWN. */ |
| |
| static unsigned char |
| get_content_index (rtx loc) |
| { |
| machine_mode mode; |
| |
| if (loc == NULL_RTX) |
| return NOT_KNOWN; |
| |
| if (REG_P (loc)) |
| { |
| if (REGNO (loc) < 32) |
| return REGNO (loc); |
| return NOT_KNOWN; |
| } |
| |
| mode = GET_MODE (loc); |
| |
| if (! rl78_stack_based_mem (loc, mode)) |
| return NOT_KNOWN; |
| |
| loc = XEXP (loc, 0); |
| |
| if (REG_P (loc)) |
| /* loc = MEM (SP) */ |
| return 32; |
| |
| /* loc = MEM (PLUS (SP, INT)). */ |
| loc = XEXP (loc, 1); |
| |
| if (INTVAL (loc) < NUM_STACK_LOCS) |
| return 32 + INTVAL (loc); |
| |
| return NOT_KNOWN; |
| } |
| |
| /* Return a string describing content INDEX in mode MODE. |
| WARNING: Can return a pointer to a static buffer. */ |
| static const char * |
| get_content_name (unsigned char index, machine_mode mode) |
| { |
| static char buffer [128]; |
| |
| if (index == NOT_KNOWN) |
| return "Unknown"; |
| |
| if (index > 31) |
| sprintf (buffer, "stack slot %d", index - 32); |
| else if (mode == HImode) |
| sprintf (buffer, "%s%s", |
| reg_names [index + 1], reg_names [index]); |
| else |
| return reg_names [index]; |
| |
| return buffer; |
| } |
| |
| #if DEBUG_ALLOC |
| |
| static void |
| display_content_memory (FILE * file) |
| { |
| unsigned int i; |
| |
| fprintf (file, " Known memory contents:\n"); |
| |
| for (i = 0; i < sizeof content_memory; i++) |
| if (content_memory[i] != NOT_KNOWN) |
| { |
| fprintf (file, " %s contains a copy of ", get_content_name (i, QImode)); |
| fprintf (file, "%s\n", get_content_name (content_memory [i], QImode)); |
| } |
| } |
| #endif |
| |
| static void |
| update_content (unsigned char index, unsigned char val, machine_mode mode) |
| { |
| unsigned int i; |
| |
| gcc_assert (index < sizeof content_memory); |
| |
| content_memory [index] = val; |
| if (val != NOT_KNOWN) |
| content_memory [val] = index; |
| |
| /* Make the entry in dump_file *before* VAL is increased below. */ |
| if (dump_file) |
| { |
| fprintf (dump_file, " %s now contains ", get_content_name (index, mode)); |
| if (val == NOT_KNOWN) |
| fprintf (dump_file, "Unknown\n"); |
| else |
| fprintf (dump_file, "%s and vice versa\n", get_content_name (val, mode)); |
| } |
| |
| if (mode == HImode) |
| { |
| val = val == NOT_KNOWN ? val : val + 1; |
| |
| content_memory [index + 1] = val; |
| if (val != NOT_KNOWN) |
| { |
| content_memory [val] = index + 1; |
| -- val; |
| } |
| } |
| |
| /* Any other places that had INDEX recorded as their contents are now invalid. */ |
| for (i = 0; i < sizeof content_memory; i++) |
| { |
| if (i == index |
| || (val != NOT_KNOWN && i == val)) |
| { |
| if (mode == HImode) |
| ++ i; |
| continue; |
| } |
| |
| if (content_memory[i] == index |
| || (val != NOT_KNOWN && content_memory[i] == val)) |
| { |
| content_memory[i] = NOT_KNOWN; |
| |
| if (dump_file) |
| fprintf (dump_file, " %s cleared\n", get_content_name (i, mode)); |
| |
| if (mode == HImode) |
| content_memory[++ i] = NOT_KNOWN; |
| } |
| } |
| } |
| |
| /* Record that LOC contains VALUE. |
| For HImode locations record that LOC+1 contains VALUE+1. |
| If LOC is not a register or stack slot, do nothing. |
| If VALUE is not a register or stack slot, clear the recorded content. */ |
| |
| static void |
| record_content (rtx loc, rtx value) |
| { |
| machine_mode mode; |
| unsigned char index; |
| unsigned char val; |
| |
| if ((index = get_content_index (loc)) == NOT_KNOWN) |
| return; |
| |
| val = get_content_index (value); |
| |
| mode = GET_MODE (loc); |
| |
| if (val == index) |
| { |
| if (! optimize) |
| return; |
| |
| /* This should not happen when optimizing. */ |
| #if 1 |
| fprintf (stderr, "ASSIGNMENT of location to itself detected! [%s]\n", |
| get_content_name (val, mode)); |
| return; |
| #else |
| gcc_unreachable (); |
| #endif |
| } |
| |
| update_content (index, val, mode); |
| } |
| |
| /* Returns TRUE if LOC already contains a copy of VALUE. */ |
| |
| static bool |
| already_contains (rtx loc, rtx value) |
| { |
| unsigned char index; |
| unsigned char val; |
| |
| if ((index = get_content_index (loc)) == NOT_KNOWN) |
| return false; |
| |
| if ((val = get_content_index (value)) == NOT_KNOWN) |
| return false; |
| |
| if (content_memory [index] != val) |
| return false; |
| |
| if (GET_MODE (loc) == HImode) |
| return content_memory [index + 1] == val + 1; |
| |
| return true; |
| } |
| |
| bool |
| rl78_es_addr (rtx addr) |
| { |
| if (GET_CODE (addr) == MEM) |
| addr = XEXP (addr, 0); |
| if (GET_CODE (addr) != UNSPEC) |
| return false; |
| if (XINT (addr, 1) != UNS_ES_ADDR) |
| return false; |
| return true; |
| } |
| |
| rtx |
| rl78_es_base (rtx addr) |
| { |
| if (GET_CODE (addr) == MEM) |
| addr = XEXP (addr, 0); |
| addr = XVECEXP (addr, 0, 1); |
| if (GET_CODE (addr) == CONST |
| && GET_CODE (XEXP (addr, 0)) == ZERO_EXTRACT) |
| addr = XEXP (XEXP (addr, 0), 0); |
| /* Mode doesn't matter here. */ |
| return gen_rtx_MEM (HImode, addr); |
| } |
| |
| /* Rescans an insn to see if it's recognized again. This is done |
| carefully to ensure that all the constraint information is accurate |
| for the newly matched insn. */ |
| static bool |
| insn_ok_now (rtx_insn * insn) |
| { |
| rtx pattern = PATTERN (insn); |
| int i; |
| |
| INSN_CODE (insn) = -1; |
| |
| if (recog (pattern, insn, 0) > -1) |
| { |
| extract_insn (insn); |
| if (constrain_operands (1, get_preferred_alternatives (insn))) |
| { |
| #if DEBUG_ALLOC |
| fprintf (stderr, "\033[32m"); |
| debug_rtx (insn); |
| fprintf (stderr, "\033[0m"); |
| #endif |
| if (SET_P (pattern)) |
| record_content (SET_DEST (pattern), SET_SRC (pattern)); |
| |
| /* We need to detect far addresses that haven't been |
| converted to es/lo16 format. */ |
| for (i=0; i<recog_data.n_operands; i++) |
| if (GET_CODE (OP (i)) == MEM |
| && GET_MODE (XEXP (OP (i), 0)) == SImode |
| && GET_CODE (XEXP (OP (i), 0)) != UNSPEC) |
| return false; |
| |
| return true; |
| } |
| } |
| else |
| { |
| /* We need to re-recog the insn with virtual registers to get |
| the operands. */ |
| cfun->machine->virt_insns_ok = 1; |
| if (recog (pattern, insn, 0) > -1) |
| { |
| extract_insn (insn); |
| if (constrain_operands (0, get_preferred_alternatives (insn))) |
| { |
| cfun->machine->virt_insns_ok = 0; |
| return false; |
| } |
| } |
| |
| #if DEBUG_ALLOC |
| fprintf (stderr, "\033[41;30m Unrecognized *virtual* insn \033[0m\n"); |
| debug_rtx (insn); |
| #endif |
| gcc_unreachable (); |
| } |
| |
| #if DEBUG_ALLOC |
| fprintf (stderr, "\033[31m"); |
| debug_rtx (insn); |
| fprintf (stderr, "\033[0m"); |
| #endif |
| return false; |
| } |
| |
| #if DEBUG_ALLOC |
| #define WORKED fprintf (stderr, "\033[48;5;22m Worked at line %d \033[0m\n", __LINE__) |
| #define FAILEDSOFAR fprintf (stderr, "\033[48;5;52m FAILED at line %d \033[0m\n", __LINE__) |
| #define FAILED fprintf (stderr, "\033[48;5;52m FAILED at line %d \033[0m\n", __LINE__), gcc_unreachable () |
| #define MAYBE_OK(insn) if (insn_ok_now (insn)) { WORKED; return; } else { FAILEDSOFAR; } |
| #define MUST_BE_OK(insn) if (insn_ok_now (insn)) { WORKED; return; } FAILED |
| #else |
| #define FAILED gcc_unreachable () |
| #define MAYBE_OK(insn) if (insn_ok_now (insn)) return; |
| #define MUST_BE_OK(insn) if (insn_ok_now (insn)) return; FAILED |
| #endif |
| |
| /* Registers into which we move the contents of virtual registers. */ |
| #define X gen_rtx_REG (QImode, X_REG) |
| #define A gen_rtx_REG (QImode, A_REG) |
| #define C gen_rtx_REG (QImode, C_REG) |
| #define B gen_rtx_REG (QImode, B_REG) |
| #define E gen_rtx_REG (QImode, E_REG) |
| #define D gen_rtx_REG (QImode, D_REG) |
| #define L gen_rtx_REG (QImode, L_REG) |
| #define H gen_rtx_REG (QImode, H_REG) |
| |
| #define AX gen_rtx_REG (HImode, AX_REG) |
| #define BC gen_rtx_REG (HImode, BC_REG) |
| #define DE gen_rtx_REG (HImode, DE_REG) |
| #define HL gen_rtx_REG (HImode, HL_REG) |
| |
| /* Returns TRUE if R is a virtual register. */ |
| static inline bool |
| is_virtual_register (rtx r) |
| { |
| return (GET_CODE (r) == REG |
| && REGNO (r) >= 8 |
| && REGNO (r) < 32); |
| } |
| |
| /* In all these alloc routines, we expect the following: the insn |
| pattern is unshared, the insn was previously recognized and failed |
| due to predicates or constraints, and the operand data is in |
| recog_data. */ |
| |
| static int virt_insn_was_frame; |
| |
| /* Hook for all insns we emit. Re-mark them as FRAME_RELATED if |
| needed. */ |
| static rtx |
| EM2 (int line ATTRIBUTE_UNUSED, rtx r) |
| { |
| #if DEBUG_ALLOC |
| fprintf (stderr, "\033[36m%d: ", line); |
| debug_rtx (r); |
| fprintf (stderr, "\033[0m"); |
| #endif |
| /*SCHED_GROUP_P (r) = 1;*/ |
| if (virt_insn_was_frame) |
| RTX_FRAME_RELATED_P (r) = 1; |
| return r; |
| } |
| |
| #define EM(x) EM2 (__LINE__, x) |
| |
| /* Return a suitable RTX for the low half of a __far address. */ |
| static rtx |
| rl78_lo16 (rtx addr) |
| { |
| rtx r; |
| |
| if (GET_CODE (addr) == SYMBOL_REF |
| || GET_CODE (addr) == CONST) |
| { |
| r = gen_rtx_ZERO_EXTRACT (HImode, addr, GEN_INT (16), GEN_INT (0)); |
| r = gen_rtx_CONST (HImode, r); |
| } |
| else |
| r = rl78_subreg (HImode, addr, SImode, 0); |
| |
| r = gen_es_addr (r); |
| cfun->machine->uses_es = true; |
| |
| return r; |
| } |
| |
| /* Return a suitable RTX for the high half's lower byte of a __far address. */ |
| static rtx |
| rl78_hi8 (rtx addr) |
| { |
| if (GET_CODE (addr) == SYMBOL_REF |
| || GET_CODE (addr) == CONST) |
| { |
| rtx r = gen_rtx_ZERO_EXTRACT (QImode, addr, GEN_INT (8), GEN_INT (16)); |
| r = gen_rtx_CONST (QImode, r); |
| return r; |
| } |
| return rl78_subreg (QImode, addr, SImode, 2); |
| } |
| |
| static void |
| add_postponed_content_update (rtx to, rtx value) |
| { |
| unsigned char index; |
| |
| if ((index = get_content_index (to)) == NOT_KNOWN) |
| return; |
| |
| gcc_assert (saved_update_index == NOT_KNOWN); |
| saved_update_index = index; |
| saved_update_value = get_content_index (value); |
| saved_update_mode = GET_MODE (to); |
| } |
| |
| static void |
| process_postponed_content_update (void) |
| { |
| if (saved_update_index != NOT_KNOWN) |
| { |
| update_content (saved_update_index, saved_update_value, saved_update_mode); |
| saved_update_index = NOT_KNOWN; |
| } |
| } |
| |
| /* Generate and emit a move of (register) FROM into TO. if WHERE is not NULL |
| then if BEFORE is true then emit the insn before WHERE, otherwise emit it |
| after WHERE. If TO already contains FROM then do nothing. Returns TO if |
| BEFORE is true, FROM otherwise. */ |
| static rtx |
| gen_and_emit_move (rtx to, rtx from, rtx where, bool before) |
| { |
| machine_mode mode = GET_MODE (to); |
| |
| if (optimize && before && already_contains (to, from)) |
| { |
| #if DEBUG_ALLOC |
| display_content_memory (stderr); |
| #endif |
| if (dump_file) |
| { |
| fprintf (dump_file, " Omit move of %s into ", |
| get_content_name (get_content_index (from), mode)); |
| fprintf (dump_file, "%s as it already contains this value\n", |
| get_content_name (get_content_index (to), mode)); |
| } |
| } |
| else |
| { |
| rtx move = mode == QImode ? gen_movqi (to, from) : gen_movhi (to, from); |
| |
| EM (move); |
| |
| if (where == NULL_RTX) |
| emit_insn (move); |
| else if (before) |
| emit_insn_before (move, where); |
| else |
| { |
| rtx note = find_reg_note (where, REG_EH_REGION, NULL_RTX); |
| |
| /* If necessary move REG_EH_REGION notes forward. |
| cf. compiling gcc.dg/pr44545.c. */ |
| if (note != NULL_RTX) |
| { |
| add_reg_note (move, REG_EH_REGION, XEXP (note, 0)); |
| remove_note (where, note); |
| } |
| |
| emit_insn_after (move, where); |
| } |
| |
| if (before) |
| record_content (to, from); |
| else |
| add_postponed_content_update (to, from); |
| } |
| |
| return before ? to : from; |
| } |
| |
| /* If M is MEM(REG) or MEM(PLUS(REG,INT)) and REG is virtual then |
| copy it into NEWBASE and return the updated MEM. Otherwise just |
| return M. Any needed insns are emitted before BEFORE. */ |
| static rtx |
| transcode_memory_rtx (rtx m, rtx newbase, rtx before) |
| { |
| rtx base, index, addendr; |
| int addend = 0; |
| int need_es = 0; |
| |
| if (! MEM_P (m)) |
| return m; |
| |
| if (GET_MODE (XEXP (m, 0)) == SImode) |
| { |
| rtx new_m; |
| rtx seg = rl78_hi8 (XEXP (m, 0)); |
| |
| if (!TARGET_ES0) |
| { |
| emit_insn_before (EM (gen_movqi (A, seg)), before); |
| emit_insn_before (EM (gen_movqi_to_es (A)), before); |
| } |
| |
| record_content (A, NULL_RTX); |
| |
| new_m = gen_rtx_MEM (GET_MODE (m), rl78_lo16 (XEXP (m, 0))); |
| MEM_COPY_ATTRIBUTES (new_m, m); |
| m = new_m; |
| need_es = 1; |
| } |
| |
| characterize_address (XEXP (m, 0), & base, & index, & addendr); |
| gcc_assert (index == NULL_RTX); |
| |
| if (base == NULL_RTX) |
| return m; |
| |
| if (addendr && GET_CODE (addendr) == CONST_INT) |
| addend = INTVAL (addendr); |
| |
| gcc_assert (REG_P (base)); |
| gcc_assert (REG_P (newbase)); |
| |
| int limit = 256 - GET_MODE_SIZE (GET_MODE (m)); |
| |
| if (REGNO (base) == SP_REG) |
| { |
| if (addend >= 0 && addend <= limit) |
| return m; |
| } |
| |
| /* BASE should be a virtual register. We copy it to NEWBASE. If |
| the addend is out of range for DE/HL, we use AX to compute the full |
| address. */ |
| |
| if (addend < 0 |
| || (addend > limit && REGNO (newbase) != BC_REG) |
| || (addendr |
| && (GET_CODE (addendr) != CONST_INT) |
| && ((REGNO (newbase) != BC_REG)) |
| )) |
| { |
| /* mov ax, vreg |
| add ax, #imm |
| mov hl, ax */ |
| EM (emit_insn_before (gen_movhi (AX, base), before)); |
| EM (emit_insn_before (gen_addhi3 (AX, AX, addendr), before)); |
| EM (emit_insn_before (gen_movhi (newbase, AX), before)); |
| record_content (AX, NULL_RTX); |
| record_content (newbase, NULL_RTX); |
| |
| base = newbase; |
| addend = 0; |
| addendr = 0; |
| } |
| else |
| { |
| base = gen_and_emit_move (newbase, base, before, true); |
| } |
| |
| if (addend) |
| { |
| record_content (base, NULL_RTX); |
| base = gen_rtx_PLUS (HImode, base, GEN_INT (addend)); |
| } |
| else if (addendr) |
| { |
| record_content (base, NULL_RTX); |
| base = gen_rtx_PLUS (HImode, base, addendr); |
| } |
| |
| if (need_es) |
| { |
| m = change_address (m, GET_MODE (m), gen_es_addr (base)); |
| cfun->machine->uses_es = true; |
| } |
| else |
| m = change_address (m, GET_MODE (m), base); |
| return m; |
| } |
| |
| /* Copy SRC to accumulator (A or AX), placing any generated insns |
| before BEFORE. Returns accumulator RTX. */ |
| static rtx |
| move_to_acc (int opno, rtx before) |
| { |
| rtx src = OP (opno); |
| machine_mode mode = GET_MODE (src); |
| |
| if (REG_P (src) && REGNO (src) < 2) |
| return src; |
| |
| if (mode == VOIDmode) |
| mode = recog_data.operand_mode[opno]; |
| |
| return gen_and_emit_move (mode == QImode ? A : AX, src, before, true); |
| } |
| |
| static void |
| force_into_acc (rtx src, rtx before) |
| { |
| machine_mode mode = GET_MODE (src); |
| rtx move; |
| |
| if (REG_P (src) && REGNO (src) < 2) |
| return; |
| |
| move = mode == QImode ? gen_movqi (A, src) : gen_movhi (AX, src); |
| |
| EM (move); |
| |
| emit_insn_before (move, before); |
| record_content (AX, NULL_RTX); |
| } |
| |
| /* Copy accumulator (A or AX) to DEST, placing any generated insns |
| after AFTER. Returns accumulator RTX. */ |
| static rtx |
| move_from_acc (unsigned int opno, rtx after) |
| { |
| rtx dest = OP (opno); |
| machine_mode mode = GET_MODE (dest); |
| |
| if (REG_P (dest) && REGNO (dest) < 2) |
| return dest; |
| |
| return gen_and_emit_move (dest, mode == QImode ? A : AX, after, false); |
| } |
| |
| /* Copy accumulator (A or AX) to REGNO, placing any generated insns |
| before BEFORE. Returns reg RTX. */ |
| static rtx |
| move_acc_to_reg (rtx acc, int regno, rtx before) |
| { |
| machine_mode mode = GET_MODE (acc); |
| rtx reg; |
| |
| reg = gen_rtx_REG (mode, regno); |
| |
| return gen_and_emit_move (reg, acc, before, true); |
| } |
| |
| /* Copy SRC to X, placing any generated insns before BEFORE. |
| Returns X RTX. */ |
| static rtx |
| move_to_x (int opno, rtx before) |
| { |
| rtx src = OP (opno); |
| machine_mode mode = GET_MODE (src); |
| rtx reg; |
| |
| if (mode == VOIDmode) |
| mode = recog_data.operand_mode[opno]; |
| reg = (mode == QImode) ? X : AX; |
| |
| if (mode == QImode || ! is_virtual_register (OP (opno))) |
| { |
| OP (opno) = move_to_acc (opno, before); |
| OP (opno) = move_acc_to_reg (OP (opno), X_REG, before); |
| return reg; |
| } |
| |
| return gen_and_emit_move (reg, src, before, true); |
| } |
| |
| /* Copy OP (opno) to H or HL, placing any generated insns before BEFORE. |
| Returns H/HL RTX. */ |
| static rtx |
| move_to_hl (int opno, rtx before) |
| { |
| rtx src = OP (opno); |
| machine_mode mode = GET_MODE (src); |
| rtx reg; |
| |
| if (mode == VOIDmode) |
| mode = recog_data.operand_mode[opno]; |
| reg = (mode == QImode) ? L : HL; |
| |
| if (mode == QImode || ! is_virtual_register (OP (opno))) |
| { |
| OP (opno) = move_to_acc (opno, before); |
| OP (opno) = move_acc_to_reg (OP (opno), L_REG, before); |
| return reg; |
| } |
| |
| return gen_and_emit_move (reg, src, before, true); |
| } |
| |
| /* Copy OP (opno) to E or DE, placing any generated insns before BEFORE. |
| Returns E/DE RTX. */ |
| static rtx |
| move_to_de (int opno, rtx before) |
| { |
| rtx src = OP (opno); |
| machine_mode mode = GET_MODE (src); |
| rtx reg; |
| |
| if (mode == VOIDmode) |
| mode = recog_data.operand_mode[opno]; |
| |
| reg = (mode == QImode) ? E : DE; |
| |
| if (mode == QImode || ! is_virtual_register (OP (opno))) |
| { |
| OP (opno) = move_to_acc (opno, before); |
| OP (opno) = move_acc_to_reg (OP (opno), E_REG, before); |
| } |
| else |
| { |
| gen_and_emit_move (reg, src, before, true); |
| } |
| |
| return reg; |
| } |
| |
| /* Devirtualize an insn of the form (SET (op) (unop (op))). */ |
| static void |
| rl78_alloc_physical_registers_op1 (rtx_insn * insn) |
| { |
| /* op[0] = func op[1] */ |
| |
| /* We first try using A as the destination, then copying it |
| back. */ |
| if (rtx_equal_p (OP (0), OP (1))) |
| { |
| OP (0) = |
| OP (1) = transcode_memory_rtx (OP (1), DE, insn); |
| } |
| else |
| { |
| /* If necessary, load the operands into BC and HL. |
| Check to see if we already have OP (0) in HL |
| and if so, swap the order. |
| |
| It is tempting to perform this optimization when OP(0) does |
| not hold a MEM, but this leads to bigger code in general. |
| The problem is that if OP(1) holds a MEM then swapping it |
| into BC means a BC-relative load is used and these are 3 |
| bytes long vs 1 byte for an HL load. */ |
| if (MEM_P (OP (0)) |
| && already_contains (HL, XEXP (OP (0), 0))) |
| { |
| OP (0) = transcode_memory_rtx (OP (0), HL, insn); |
| OP (1) = transcode_memory_rtx (OP (1), BC, insn); |
| } |
| else |
| { |
| OP (0) = transcode_memory_rtx (OP (0), BC, insn); |
| OP (1) = transcode_memory_rtx (OP (1), HL, insn); |
| } |
| } |
| |
| MAYBE_OK (insn); |
| |
| OP (0) = move_from_acc (0, insn); |
| |
| MAYBE_OK (insn); |
| |
| /* Try copying the src to acc first, then. This is for, for |
| example, ZERO_EXTEND or NOT. */ |
| OP (1) = move_to_acc (1, insn); |
| |
| MUST_BE_OK (insn); |
| } |
| |
| /* Returns true if operand OPNUM contains a constraint of type CONSTRAINT. |
| Assumes that the current insn has already been recognised and hence the |
| constraint data has been filled in. */ |
| static bool |
| has_constraint (unsigned int opnum, enum constraint_num constraint) |
| { |
| const char * p = recog_data.constraints[opnum]; |
| |
| /* No constraints means anything is accepted. */ |
| if (p == NULL || *p == 0 || *p == ',') |
| return true; |
| |
| do |
| { |
| char c; |
| unsigned int len; |
| |
| c = *p; |
| len = CONSTRAINT_LEN (c, p); |
| gcc_assert (len > 0); |
| |
| switch (c) |
| { |
| case 0: |
| case ',': |
| return false; |
| default: |
| if (lookup_constraint (p) == constraint) |
| return true; |
| } |
| p += len; |
| } |
| while (1); |
| } |
| |
| /* Devirtualize an insn of the form (SET (op) (binop (op) (op))). */ |
| static void |
| rl78_alloc_physical_registers_op2 (rtx_insn * insn) |
| { |
| rtx prev; |
| rtx first; |
| bool hl_used; |
| int tmp_id; |
| rtx saved_op1; |
| |
| if (rtx_equal_p (OP (0), OP (1))) |
| { |
| if (MEM_P (OP (2))) |
| { |
| OP (0) = |
| OP (1) = transcode_memory_rtx (OP (1), DE, insn); |
| OP (2) = transcode_memory_rtx (OP (2), HL, insn); |
| } |
| else |
| { |
| OP (0) = |
| OP (1) = transcode_memory_rtx (OP (1), HL, insn); |
| OP (2) = transcode_memory_rtx (OP (2), DE, insn); |
| } |
| } |
| else if (rtx_equal_p (OP (0), OP (2))) |
| { |
| OP (1) = transcode_memory_rtx (OP (1), DE, insn); |
| OP (0) = |
| OP (2) = transcode_memory_rtx (OP (2), HL, insn); |
| } |
| else |
| { |
| OP (0) = transcode_memory_rtx (OP (0), BC, insn); |
| OP (1) = transcode_memory_rtx (OP (1), DE, insn); |
| OP (2) = transcode_memory_rtx (OP (2), HL, insn); |
| } |
| |
| MAYBE_OK (insn); |
| |
| prev = prev_nonnote_nondebug_insn (insn); |
| if (recog_data.constraints[1][0] == '%' |
| && is_virtual_register (OP (1)) |
| && ! is_virtual_register (OP (2)) |
| && ! CONSTANT_P (OP (2))) |
| { |
| rtx tmp = OP (1); |
| OP (1) = OP (2); |
| OP (2) = tmp; |
| } |
| |
| /* Make a note of whether (H)L is being used. It matters |
| because if OP (2) also needs reloading, then we must take |
| care not to corrupt HL. */ |
| hl_used = reg_mentioned_p (L, OP (0)) || reg_mentioned_p (L, OP (1)); |
| |
| /* If HL is not currently being used and dest == op1 then there are |
| some possible optimizations available by reloading one of the |
| operands into HL, before trying to use the accumulator. */ |
| if (optimize |
| && ! hl_used |
| && rtx_equal_p (OP (0), OP (1))) |
| { |
| /* If op0 is a Ws1 type memory address then switching the base |
| address register to HL might allow us to perform an in-memory |
| operation. (eg for the INCW instruction). |
| |
| FIXME: Adding the move into HL is costly if this optimization is not |
| going to work, so for now, make sure that we know that the new insn will |
| match the requirements of the addhi3_real pattern. Really we ought to |
| generate a candidate sequence, test that, and then install it if the |
| results are good. */ |
| if (satisfies_constraint_Ws1 (OP (0)) |
| && has_constraint (0, CONSTRAINT_Wh1) |
| && (satisfies_constraint_K (OP (2)) || satisfies_constraint_L (OP (2)))) |
| { |
| rtx base, index, addend, newbase; |
| |
| characterize_address (XEXP (OP (0), 0), & base, & index, & addend); |
| gcc_assert (index == NULL_RTX); |
| gcc_assert (REG_P (base) && REGNO (base) == SP_REG); |
| |
| /* Ws1 addressing allows an offset of 0, Wh1 addressing requires a non-zero offset. */ |
| if (addend != NULL_RTX) |
| { |
| newbase = gen_and_emit_move (HL, base, insn, true); |
| record_content (newbase, NULL_RTX); |
| newbase = gen_rtx_PLUS (HImode, newbase, addend); |
| |
| OP (0) = OP (1) = change_address (OP (0), VOIDmode, newbase); |
| |
| /* We do not want to fail here as this means that |
| we have inserted useless insns into the stream. */ |
| MUST_BE_OK (insn); |
| } |
| } |
| else if (REG_P (OP (0)) |
| && satisfies_constraint_Ws1 (OP (2)) |
| && has_constraint (2, CONSTRAINT_Wh1)) |
| { |
| rtx base, index, addend, newbase; |
| |
| characterize_address (XEXP (OP (2), 0), & base, & index, & addend); |
| gcc_assert (index == NULL_RTX); |
| gcc_assert (REG_P (base) && REGNO (base) == SP_REG); |
| |
| /* Ws1 addressing allows an offset of 0, Wh1 addressing requires a non-zero offset. */ |
| if (addend != NULL_RTX) |
| { |
| gen_and_emit_move (HL, base, insn, true); |
| |
| if (REGNO (OP (0)) != X_REG) |
| { |
| OP (1) = |