| /* Subroutines used by or related to instruction recognition. |
| Copyright (C) 1987, 1988, 91-98, 1999 Free Software Foundation, Inc. |
| |
| This file is part of GNU CC. |
| |
| GNU CC 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 2, or (at your option) |
| any later version. |
| |
| GNU CC 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 GNU CC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| |
| #include "config.h" |
| #include "system.h" |
| #include "rtl.h" |
| #include "insn-config.h" |
| #include "insn-attr.h" |
| #include "insn-flags.h" |
| #include "insn-codes.h" |
| #include "recog.h" |
| #include "regs.h" |
| #include "hard-reg-set.h" |
| #include "flags.h" |
| #include "real.h" |
| #include "toplev.h" |
| #include "basic-block.h" |
| |
| #ifndef STACK_PUSH_CODE |
| #ifdef STACK_GROWS_DOWNWARD |
| #define STACK_PUSH_CODE PRE_DEC |
| #else |
| #define STACK_PUSH_CODE PRE_INC |
| #endif |
| #endif |
| |
| #ifndef STACK_POP_CODE |
| #ifdef STACK_GROWS_DOWNWARD |
| #define STACK_POP_CODE POST_INC |
| #else |
| #define STACK_POP_CODE POST_DEC |
| #endif |
| #endif |
| |
| static void validate_replace_rtx_1 PROTO((rtx *, rtx, rtx, rtx)); |
| static rtx *find_single_use_1 PROTO((rtx, rtx *)); |
| static rtx *find_constant_term_loc PROTO((rtx *)); |
| static int insn_invalid_p PROTO((rtx)); |
| |
| /* Nonzero means allow operands to be volatile. |
| This should be 0 if you are generating rtl, such as if you are calling |
| the functions in optabs.c and expmed.c (most of the time). |
| This should be 1 if all valid insns need to be recognized, |
| such as in regclass.c and final.c and reload.c. |
| |
| init_recog and init_recog_no_volatile are responsible for setting this. */ |
| |
| int volatile_ok; |
| |
| /* The next variables are set up by extract_insn. The first four of them |
| are also set up during insn_extract. */ |
| |
| /* Indexed by N, gives value of operand N. */ |
| rtx recog_operand[MAX_RECOG_OPERANDS]; |
| |
| /* Indexed by N, gives location where operand N was found. */ |
| rtx *recog_operand_loc[MAX_RECOG_OPERANDS]; |
| |
| /* Indexed by N, gives location where the Nth duplicate-appearance of |
| an operand was found. This is something that matched MATCH_DUP. */ |
| rtx *recog_dup_loc[MAX_RECOG_OPERANDS]; |
| |
| /* Indexed by N, gives the operand number that was duplicated in the |
| Nth duplicate-appearance of an operand. */ |
| char recog_dup_num[MAX_RECOG_OPERANDS]; |
| |
| /* The number of operands of the insn. */ |
| int recog_n_operands; |
| |
| /* The number of MATCH_DUPs in the insn. */ |
| int recog_n_dups; |
| |
| /* The number of alternatives in the constraints for the insn. */ |
| int recog_n_alternatives; |
| |
| /* Indexed by N, gives the mode of operand N. */ |
| enum machine_mode recog_operand_mode[MAX_RECOG_OPERANDS]; |
| |
| /* Indexed by N, gives the constraint string for operand N. */ |
| const char *recog_constraints[MAX_RECOG_OPERANDS]; |
| |
| /* Indexed by N, gives the type (in, out, inout) for operand N. */ |
| enum op_type recog_op_type[MAX_RECOG_OPERANDS]; |
| |
| #ifndef REGISTER_CONSTRAINTS |
| /* Indexed by N, nonzero if operand N should be an address. */ |
| char recog_operand_address_p[MAX_RECOG_OPERANDS]; |
| #endif |
| |
| /* Contains a vector of operand_alternative structures for every operand. |
| Set up by preprocess_constraints. */ |
| struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES]; |
| |
| /* On return from `constrain_operands', indicate which alternative |
| was satisfied. */ |
| |
| int which_alternative; |
| |
| /* Nonzero after end of reload pass. |
| Set to 1 or 0 by toplev.c. |
| Controls the significance of (SUBREG (MEM)). */ |
| |
| int reload_completed; |
| |
| /* Initialize data used by the function `recog'. |
| This must be called once in the compilation of a function |
| before any insn recognition may be done in the function. */ |
| |
| void |
| init_recog_no_volatile () |
| { |
| volatile_ok = 0; |
| } |
| |
| void |
| init_recog () |
| { |
| volatile_ok = 1; |
| } |
| |
| /* Try recognizing the instruction INSN, |
| and return the code number that results. |
| Remember the code so that repeated calls do not |
| need to spend the time for actual rerecognition. |
| |
| This function is the normal interface to instruction recognition. |
| The automatically-generated function `recog' is normally called |
| through this one. (The only exception is in combine.c.) */ |
| |
| int |
| recog_memoized (insn) |
| rtx insn; |
| { |
| if (INSN_CODE (insn) < 0) |
| INSN_CODE (insn) = recog (PATTERN (insn), insn, NULL_PTR); |
| return INSN_CODE (insn); |
| } |
| |
| /* Check that X is an insn-body for an `asm' with operands |
| and that the operands mentioned in it are legitimate. */ |
| |
| int |
| check_asm_operands (x) |
| rtx x; |
| { |
| int noperands; |
| rtx *operands; |
| const char **constraints; |
| int i; |
| |
| /* Post-reload, be more strict with things. */ |
| if (reload_completed) |
| { |
| /* ??? Doh! We've not got the wrapping insn. Cook one up. */ |
| extract_insn (make_insn_raw (x)); |
| constrain_operands (1); |
| return which_alternative >= 0; |
| } |
| |
| noperands = asm_noperands (x); |
| if (noperands < 0) |
| return 0; |
| if (noperands == 0) |
| return 1; |
| |
| operands = (rtx *) alloca (noperands * sizeof (rtx)); |
| constraints = (const char **) alloca (noperands * sizeof (char *)); |
| |
| decode_asm_operands (x, operands, NULL_PTR, constraints, NULL_PTR); |
| |
| for (i = 0; i < noperands; i++) |
| { |
| const char *c = constraints[i]; |
| if (c[0] == '%') |
| c++; |
| if (ISDIGIT ((unsigned char)c[0]) && c[1] == '\0') |
| c = constraints[c[0] - '0']; |
| |
| if (! asm_operand_ok (operands[i], c)) |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* Static data for the next two routines. */ |
| |
| typedef struct change_t |
| { |
| rtx object; |
| int old_code; |
| rtx *loc; |
| rtx old; |
| } change_t; |
| |
| static change_t *changes; |
| static int changes_allocated; |
| |
| static int num_changes = 0; |
| |
| /* Validate a proposed change to OBJECT. LOC is the location in the rtl for |
| at which NEW will be placed. If OBJECT is zero, no validation is done, |
| the change is simply made. |
| |
| Two types of objects are supported: If OBJECT is a MEM, memory_address_p |
| will be called with the address and mode as parameters. If OBJECT is |
| an INSN, CALL_INSN, or JUMP_INSN, the insn will be re-recognized with |
| the change in place. |
| |
| IN_GROUP is non-zero if this is part of a group of changes that must be |
| performed as a group. In that case, the changes will be stored. The |
| function `apply_change_group' will validate and apply the changes. |
| |
| If IN_GROUP is zero, this is a single change. Try to recognize the insn |
| or validate the memory reference with the change applied. If the result |
| is not valid for the machine, suppress the change and return zero. |
| Otherwise, perform the change and return 1. */ |
| |
| int |
| validate_change (object, loc, new, in_group) |
| rtx object; |
| rtx *loc; |
| rtx new; |
| int in_group; |
| { |
| rtx old = *loc; |
| |
| if (old == new || rtx_equal_p (old, new)) |
| return 1; |
| |
| if (in_group == 0 && num_changes != 0) |
| abort (); |
| |
| *loc = new; |
| |
| /* Save the information describing this change. */ |
| if (num_changes >= changes_allocated) |
| { |
| if (changes_allocated == 0) |
| /* This value allows for repeated substitutions inside complex |
| indexed addresses, or changes in up to 5 insns. */ |
| changes_allocated = MAX_RECOG_OPERANDS * 5; |
| else |
| changes_allocated *= 2; |
| |
| changes = |
| (change_t*) xrealloc (changes, |
| sizeof (change_t) * changes_allocated); |
| } |
| |
| changes[num_changes].object = object; |
| changes[num_changes].loc = loc; |
| changes[num_changes].old = old; |
| |
| if (object && GET_CODE (object) != MEM) |
| { |
| /* Set INSN_CODE to force rerecognition of insn. Save old code in |
| case invalid. */ |
| changes[num_changes].old_code = INSN_CODE (object); |
| INSN_CODE (object) = -1; |
| } |
| |
| num_changes++; |
| |
| /* If we are making a group of changes, return 1. Otherwise, validate the |
| change group we made. */ |
| |
| if (in_group) |
| return 1; |
| else |
| return apply_change_group (); |
| } |
| |
| /* This subroutine of apply_change_group verifies whether the changes to INSN |
| were valid; i.e. whether INSN can still be recognized. */ |
| |
| static int |
| insn_invalid_p (insn) |
| rtx insn; |
| { |
| int icode = recog_memoized (insn); |
| int is_asm = icode < 0 && asm_noperands (PATTERN (insn)) >= 0; |
| |
| if (is_asm && ! check_asm_operands (PATTERN (insn))) |
| return 1; |
| if (! is_asm && icode < 0) |
| return 1; |
| |
| /* After reload, verify that all constraints are satisfied. */ |
| if (reload_completed) |
| { |
| extract_insn (insn); |
| |
| if (! constrain_operands (1)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Apply a group of changes previously issued with `validate_change'. |
| Return 1 if all changes are valid, zero otherwise. */ |
| |
| int |
| apply_change_group () |
| { |
| int i; |
| |
| /* The changes have been applied and all INSN_CODEs have been reset to force |
| rerecognition. |
| |
| The changes are valid if we aren't given an object, or if we are |
| given a MEM and it still is a valid address, or if this is in insn |
| and it is recognized. In the latter case, if reload has completed, |
| we also require that the operands meet the constraints for |
| the insn. */ |
| |
| for (i = 0; i < num_changes; i++) |
| { |
| rtx object = changes[i].object; |
| |
| if (object == 0) |
| continue; |
| |
| if (GET_CODE (object) == MEM) |
| { |
| if (! memory_address_p (GET_MODE (object), XEXP (object, 0))) |
| break; |
| } |
| else if (insn_invalid_p (object)) |
| { |
| rtx pat = PATTERN (object); |
| |
| /* Perhaps we couldn't recognize the insn because there were |
| extra CLOBBERs at the end. If so, try to re-recognize |
| without the last CLOBBER (later iterations will cause each of |
| them to be eliminated, in turn). But don't do this if we |
| have an ASM_OPERAND. */ |
| if (GET_CODE (pat) == PARALLEL |
| && GET_CODE (XVECEXP (pat, 0, XVECLEN (pat, 0) - 1)) == CLOBBER |
| && asm_noperands (PATTERN (object)) < 0) |
| { |
| rtx newpat; |
| |
| if (XVECLEN (pat, 0) == 2) |
| newpat = XVECEXP (pat, 0, 0); |
| else |
| { |
| int j; |
| |
| newpat = gen_rtx_PARALLEL (VOIDmode, |
| gen_rtvec (XVECLEN (pat, 0) - 1)); |
| for (j = 0; j < XVECLEN (newpat, 0); j++) |
| XVECEXP (newpat, 0, j) = XVECEXP (pat, 0, j); |
| } |
| |
| /* Add a new change to this group to replace the pattern |
| with this new pattern. Then consider this change |
| as having succeeded. The change we added will |
| cause the entire call to fail if things remain invalid. |
| |
| Note that this can lose if a later change than the one |
| we are processing specified &XVECEXP (PATTERN (object), 0, X) |
| but this shouldn't occur. */ |
| |
| validate_change (object, &PATTERN (object), newpat, 1); |
| } |
| else if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER) |
| /* If this insn is a CLOBBER or USE, it is always valid, but is |
| never recognized. */ |
| continue; |
| else |
| break; |
| } |
| } |
| |
| if (i == num_changes) |
| { |
| num_changes = 0; |
| return 1; |
| } |
| else |
| { |
| cancel_changes (0); |
| return 0; |
| } |
| } |
| |
| /* Return the number of changes so far in the current group. */ |
| |
| int |
| num_validated_changes () |
| { |
| return num_changes; |
| } |
| |
| /* Retract the changes numbered NUM and up. */ |
| |
| void |
| cancel_changes (num) |
| int num; |
| { |
| int i; |
| |
| /* Back out all the changes. Do this in the opposite order in which |
| they were made. */ |
| for (i = num_changes - 1; i >= num; i--) |
| { |
| *changes[i].loc = changes[i].old; |
| if (changes[i].object && GET_CODE (changes[i].object) != MEM) |
| INSN_CODE (changes[i].object) = changes[i].old_code; |
| } |
| num_changes = num; |
| } |
| |
| /* Replace every occurrence of FROM in X with TO. Mark each change with |
| validate_change passing OBJECT. */ |
| |
| static void |
| validate_replace_rtx_1 (loc, from, to, object) |
| rtx *loc; |
| rtx from, to, object; |
| { |
| register int i, j; |
| register char *fmt; |
| register rtx x = *loc; |
| enum rtx_code code = GET_CODE (x); |
| |
| /* X matches FROM if it is the same rtx or they are both referring to the |
| same register in the same mode. Avoid calling rtx_equal_p unless the |
| operands look similar. */ |
| |
| if (x == from |
| || (GET_CODE (x) == REG && GET_CODE (from) == REG |
| && GET_MODE (x) == GET_MODE (from) |
| && REGNO (x) == REGNO (from)) |
| || (GET_CODE (x) == GET_CODE (from) && GET_MODE (x) == GET_MODE (from) |
| && rtx_equal_p (x, from))) |
| { |
| validate_change (object, loc, to, 1); |
| return; |
| } |
| |
| /* For commutative or comparison operations, try replacing each argument |
| separately and seeing if we made any changes. If so, put a constant |
| argument last.*/ |
| if (GET_RTX_CLASS (code) == '<' || GET_RTX_CLASS (code) == 'c') |
| { |
| int prev_changes = num_changes; |
| |
| validate_replace_rtx_1 (&XEXP (x, 0), from, to, object); |
| validate_replace_rtx_1 (&XEXP (x, 1), from, to, object); |
| if (prev_changes != num_changes && CONSTANT_P (XEXP (x, 0))) |
| { |
| validate_change (object, loc, |
| gen_rtx_fmt_ee (GET_RTX_CLASS (code) == 'c' ? code |
| : swap_condition (code), |
| GET_MODE (x), XEXP (x, 1), |
| XEXP (x, 0)), |
| 1); |
| x = *loc; |
| code = GET_CODE (x); |
| } |
| } |
| |
| /* Note that if CODE's RTX_CLASS is "c" or "<" we will have already |
| done the substitution, otherwise we won't. */ |
| |
| switch (code) |
| { |
| case PLUS: |
| /* If we have a PLUS whose second operand is now a CONST_INT, use |
| plus_constant to try to simplify it. */ |
| if (GET_CODE (XEXP (x, 1)) == CONST_INT && XEXP (x, 1) == to) |
| validate_change (object, loc, plus_constant (XEXP (x, 0), INTVAL (to)), |
| 1); |
| return; |
| |
| case MINUS: |
| if (GET_CODE (to) == CONST_INT && XEXP (x, 1) == from) |
| { |
| validate_change (object, loc, |
| plus_constant (XEXP (x, 0), - INTVAL (to)), |
| 1); |
| return; |
| } |
| break; |
| |
| case ZERO_EXTEND: |
| case SIGN_EXTEND: |
| /* In these cases, the operation to be performed depends on the mode |
| of the operand. If we are replacing the operand with a VOIDmode |
| constant, we lose the information. So try to simplify the operation |
| in that case. If it fails, substitute in something that we know |
| won't be recognized. */ |
| if (GET_MODE (to) == VOIDmode |
| && (XEXP (x, 0) == from |
| || (GET_CODE (XEXP (x, 0)) == REG && GET_CODE (from) == REG |
| && GET_MODE (XEXP (x, 0)) == GET_MODE (from) |
| && REGNO (XEXP (x, 0)) == REGNO (from)))) |
| { |
| rtx new = simplify_unary_operation (code, GET_MODE (x), to, |
| GET_MODE (from)); |
| if (new == 0) |
| new = gen_rtx_CLOBBER (GET_MODE (x), const0_rtx); |
| |
| validate_change (object, loc, new, 1); |
| return; |
| } |
| break; |
| |
| case SUBREG: |
| /* If we have a SUBREG of a register that we are replacing and we are |
| replacing it with a MEM, make a new MEM and try replacing the |
| SUBREG with it. Don't do this if the MEM has a mode-dependent address |
| or if we would be widening it. */ |
| |
| if (SUBREG_REG (x) == from |
| && GET_CODE (from) == REG |
| && GET_CODE (to) == MEM |
| && ! mode_dependent_address_p (XEXP (to, 0)) |
| && ! MEM_VOLATILE_P (to) |
| && GET_MODE_SIZE (GET_MODE (x)) <= GET_MODE_SIZE (GET_MODE (to))) |
| { |
| int offset = SUBREG_WORD (x) * UNITS_PER_WORD; |
| enum machine_mode mode = GET_MODE (x); |
| rtx new; |
| |
| if (BYTES_BIG_ENDIAN) |
| offset += (MIN (UNITS_PER_WORD, |
| GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) |
| - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); |
| |
| new = gen_rtx_MEM (mode, plus_constant (XEXP (to, 0), offset)); |
| RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (to); |
| MEM_COPY_ATTRIBUTES (new, to); |
| validate_change (object, loc, new, 1); |
| return; |
| } |
| break; |
| |
| case ZERO_EXTRACT: |
| case SIGN_EXTRACT: |
| /* If we are replacing a register with memory, try to change the memory |
| to be the mode required for memory in extract operations (this isn't |
| likely to be an insertion operation; if it was, nothing bad will |
| happen, we might just fail in some cases). */ |
| |
| if (XEXP (x, 0) == from && GET_CODE (from) == REG && GET_CODE (to) == MEM |
| && GET_CODE (XEXP (x, 1)) == CONST_INT |
| && GET_CODE (XEXP (x, 2)) == CONST_INT |
| && ! mode_dependent_address_p (XEXP (to, 0)) |
| && ! MEM_VOLATILE_P (to)) |
| { |
| enum machine_mode wanted_mode = VOIDmode; |
| enum machine_mode is_mode = GET_MODE (to); |
| int pos = INTVAL (XEXP (x, 2)); |
| |
| #ifdef HAVE_extzv |
| if (code == ZERO_EXTRACT) |
| { |
| wanted_mode = insn_operand_mode[(int) CODE_FOR_extzv][1]; |
| if (wanted_mode == VOIDmode) |
| wanted_mode = word_mode; |
| } |
| #endif |
| #ifdef HAVE_extv |
| if (code == SIGN_EXTRACT) |
| { |
| wanted_mode = insn_operand_mode[(int) CODE_FOR_extv][1]; |
| if (wanted_mode == VOIDmode) |
| wanted_mode = word_mode; |
| } |
| #endif |
| |
| /* If we have a narrower mode, we can do something. */ |
| if (wanted_mode != VOIDmode |
| && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) |
| { |
| int offset = pos / BITS_PER_UNIT; |
| rtx newmem; |
| |
| /* If the bytes and bits are counted differently, we |
| must adjust the offset. */ |
| if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
| offset = (GET_MODE_SIZE (is_mode) - GET_MODE_SIZE (wanted_mode) |
| - offset); |
| |
| pos %= GET_MODE_BITSIZE (wanted_mode); |
| |
| newmem = gen_rtx_MEM (wanted_mode, |
| plus_constant (XEXP (to, 0), offset)); |
| RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (to); |
| MEM_COPY_ATTRIBUTES (newmem, to); |
| |
| validate_change (object, &XEXP (x, 2), GEN_INT (pos), 1); |
| validate_change (object, &XEXP (x, 0), newmem, 1); |
| } |
| } |
| |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* For commutative or comparison operations we've already performed |
| replacements. Don't try to perform them again. */ |
| if (GET_RTX_CLASS (code) != '<' && GET_RTX_CLASS (code) != 'c') |
| { |
| fmt = GET_RTX_FORMAT (code); |
| for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
| { |
| if (fmt[i] == 'e') |
| validate_replace_rtx_1 (&XEXP (x, i), from, to, object); |
| else if (fmt[i] == 'E') |
| for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
| validate_replace_rtx_1 (&XVECEXP (x, i, j), from, to, object); |
| } |
| } |
| } |
| |
| /* Try replacing every occurrence of FROM in INSN with TO. After all |
| changes have been made, validate by seeing if INSN is still valid. */ |
| |
| int |
| validate_replace_rtx (from, to, insn) |
| rtx from, to, insn; |
| { |
| validate_replace_rtx_1 (&PATTERN (insn), from, to, insn); |
| return apply_change_group (); |
| } |
| |
| /* Try replacing every occurrence of FROM in INSN with TO. After all |
| changes have been made, validate by seeing if INSN is still valid. */ |
| |
| void |
| validate_replace_rtx_group (from, to, insn) |
| rtx from, to, insn; |
| { |
| validate_replace_rtx_1 (&PATTERN (insn), from, to, insn); |
| } |
| |
| /* Try replacing every occurrence of FROM in INSN with TO, avoiding |
| SET_DESTs. After all changes have been made, validate by seeing if |
| INSN is still valid. */ |
| |
| int |
| validate_replace_src (from, to, insn) |
| rtx from, to, insn; |
| { |
| if ((GET_CODE (insn) != INSN && GET_CODE (insn) != JUMP_INSN) |
| || GET_CODE (PATTERN (insn)) != SET) |
| abort (); |
| |
| validate_replace_rtx_1 (&SET_SRC (PATTERN (insn)), from, to, insn); |
| if (GET_CODE (SET_DEST (PATTERN (insn))) == MEM) |
| validate_replace_rtx_1 (&XEXP (SET_DEST (PATTERN (insn)), 0), |
| from, to, insn); |
| return apply_change_group (); |
| } |
| |
| #ifdef HAVE_cc0 |
| /* Return 1 if the insn using CC0 set by INSN does not contain |
| any ordered tests applied to the condition codes. |
| EQ and NE tests do not count. */ |
| |
| int |
| next_insn_tests_no_inequality (insn) |
| rtx insn; |
| { |
| register rtx next = next_cc0_user (insn); |
| |
| /* If there is no next insn, we have to take the conservative choice. */ |
| if (next == 0) |
| return 0; |
| |
| return ((GET_CODE (next) == JUMP_INSN |
| || GET_CODE (next) == INSN |
| || GET_CODE (next) == CALL_INSN) |
| && ! inequality_comparisons_p (PATTERN (next))); |
| } |
| |
| #if 0 /* This is useless since the insn that sets the cc's |
| must be followed immediately by the use of them. */ |
| /* Return 1 if the CC value set up by INSN is not used. */ |
| |
| int |
| next_insns_test_no_inequality (insn) |
| rtx insn; |
| { |
| register rtx next = NEXT_INSN (insn); |
| |
| for (; next != 0; next = NEXT_INSN (next)) |
| { |
| if (GET_CODE (next) == CODE_LABEL |
| || GET_CODE (next) == BARRIER) |
| return 1; |
| if (GET_CODE (next) == NOTE) |
| continue; |
| if (inequality_comparisons_p (PATTERN (next))) |
| return 0; |
| if (sets_cc0_p (PATTERN (next)) == 1) |
| return 1; |
| if (! reg_mentioned_p (cc0_rtx, PATTERN (next))) |
| return 1; |
| } |
| return 1; |
| } |
| #endif |
| #endif |
| |
| /* This is used by find_single_use to locate an rtx that contains exactly one |
| use of DEST, which is typically either a REG or CC0. It returns a |
| pointer to the innermost rtx expression containing DEST. Appearances of |
| DEST that are being used to totally replace it are not counted. */ |
| |
| static rtx * |
| find_single_use_1 (dest, loc) |
| rtx dest; |
| rtx *loc; |
| { |
| rtx x = *loc; |
| enum rtx_code code = GET_CODE (x); |
| rtx *result = 0; |
| rtx *this_result; |
| int i; |
| char *fmt; |
| |
| switch (code) |
| { |
| case CONST_INT: |
| case CONST: |
| case LABEL_REF: |
| case SYMBOL_REF: |
| case CONST_DOUBLE: |
| case CLOBBER: |
| return 0; |
| |
| case SET: |
| /* If the destination is anything other than CC0, PC, a REG or a SUBREG |
| of a REG that occupies all of the REG, the insn uses DEST if |
| it is mentioned in the destination or the source. Otherwise, we |
| need just check the source. */ |
| if (GET_CODE (SET_DEST (x)) != CC0 |
| && GET_CODE (SET_DEST (x)) != PC |
| && GET_CODE (SET_DEST (x)) != REG |
| && ! (GET_CODE (SET_DEST (x)) == SUBREG |
| && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG |
| && (((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (x)))) |
| + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) |
| == ((GET_MODE_SIZE (GET_MODE (SET_DEST (x))) |
| + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)))) |
| break; |
| |
| return find_single_use_1 (dest, &SET_SRC (x)); |
| |
| case MEM: |
| case SUBREG: |
| return find_single_use_1 (dest, &XEXP (x, 0)); |
| |
| default: |
| break; |
| } |
| |
| /* If it wasn't one of the common cases above, check each expression and |
| vector of this code. Look for a unique usage of DEST. */ |
| |
| fmt = GET_RTX_FORMAT (code); |
| for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
| { |
| if (fmt[i] == 'e') |
| { |
| if (dest == XEXP (x, i) |
| || (GET_CODE (dest) == REG && GET_CODE (XEXP (x, i)) == REG |
| && REGNO (dest) == REGNO (XEXP (x, i)))) |
| this_result = loc; |
| else |
| this_result = find_single_use_1 (dest, &XEXP (x, i)); |
| |
| if (result == 0) |
| result = this_result; |
| else if (this_result) |
| /* Duplicate usage. */ |
| return 0; |
| } |
| else if (fmt[i] == 'E') |
| { |
| int j; |
| |
| for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
| { |
| if (XVECEXP (x, i, j) == dest |
| || (GET_CODE (dest) == REG |
| && GET_CODE (XVECEXP (x, i, j)) == REG |
| && REGNO (XVECEXP (x, i, j)) == REGNO (dest))) |
| this_result = loc; |
| else |
| this_result = find_single_use_1 (dest, &XVECEXP (x, i, j)); |
| |
| if (result == 0) |
| result = this_result; |
| else if (this_result) |
| return 0; |
| } |
| } |
| } |
| |
| return result; |
| } |
| |
| /* See if DEST, produced in INSN, is used only a single time in the |
| sequel. If so, return a pointer to the innermost rtx expression in which |
| it is used. |
| |
| If PLOC is non-zero, *PLOC is set to the insn containing the single use. |
| |
| This routine will return usually zero either before flow is called (because |
| there will be no LOG_LINKS notes) or after reload (because the REG_DEAD |
| note can't be trusted). |
| |
| If DEST is cc0_rtx, we look only at the next insn. In that case, we don't |
| care about REG_DEAD notes or LOG_LINKS. |
| |
| Otherwise, we find the single use by finding an insn that has a |
| LOG_LINKS pointing at INSN and has a REG_DEAD note for DEST. If DEST is |
| only referenced once in that insn, we know that it must be the first |
| and last insn referencing DEST. */ |
| |
| rtx * |
| find_single_use (dest, insn, ploc) |
| rtx dest; |
| rtx insn; |
| rtx *ploc; |
| { |
| rtx next; |
| rtx *result; |
| rtx link; |
| |
| #ifdef HAVE_cc0 |
| if (dest == cc0_rtx) |
| { |
| next = NEXT_INSN (insn); |
| if (next == 0 |
| || (GET_CODE (next) != INSN && GET_CODE (next) != JUMP_INSN)) |
| return 0; |
| |
| result = find_single_use_1 (dest, &PATTERN (next)); |
| if (result && ploc) |
| *ploc = next; |
| return result; |
| } |
| #endif |
| |
| if (reload_completed || reload_in_progress || GET_CODE (dest) != REG) |
| return 0; |
| |
| for (next = next_nonnote_insn (insn); |
| next != 0 && GET_CODE (next) != CODE_LABEL; |
| next = next_nonnote_insn (next)) |
| if (GET_RTX_CLASS (GET_CODE (next)) == 'i' && dead_or_set_p (next, dest)) |
| { |
| for (link = LOG_LINKS (next); link; link = XEXP (link, 1)) |
| if (XEXP (link, 0) == insn) |
| break; |
| |
| if (link) |
| { |
| result = find_single_use_1 (dest, &PATTERN (next)); |
| if (ploc) |
| *ploc = next; |
| return result; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Return 1 if OP is a valid general operand for machine mode MODE. |
| This is either a register reference, a memory reference, |
| or a constant. In the case of a memory reference, the address |
| is checked for general validity for the target machine. |
| |
| Register and memory references must have mode MODE in order to be valid, |
| but some constants have no machine mode and are valid for any mode. |
| |
| If MODE is VOIDmode, OP is checked for validity for whatever mode |
| it has. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. |
| |
| For an explanation of this function's behavior for registers of |
| class NO_REGS, see the comment for `register_operand'. */ |
| |
| int |
| general_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| register enum rtx_code code = GET_CODE (op); |
| int mode_altering_drug = 0; |
| |
| if (mode == VOIDmode) |
| mode = GET_MODE (op); |
| |
| /* Don't accept CONST_INT or anything similar |
| if the caller wants something floating. */ |
| if (GET_MODE (op) == VOIDmode && mode != VOIDmode |
| && GET_MODE_CLASS (mode) != MODE_INT |
| && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) |
| return 0; |
| |
| if (CONSTANT_P (op)) |
| return ((GET_MODE (op) == VOIDmode || GET_MODE (op) == mode) |
| #ifdef LEGITIMATE_PIC_OPERAND_P |
| && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) |
| #endif |
| && LEGITIMATE_CONSTANT_P (op)); |
| |
| /* Except for certain constants with VOIDmode, already checked for, |
| OP's mode must match MODE if MODE specifies a mode. */ |
| |
| if (GET_MODE (op) != mode) |
| return 0; |
| |
| if (code == SUBREG) |
| { |
| #ifdef INSN_SCHEDULING |
| /* On machines that have insn scheduling, we want all memory |
| reference to be explicit, so outlaw paradoxical SUBREGs. */ |
| if (GET_CODE (SUBREG_REG (op)) == MEM |
| && GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (op)))) |
| return 0; |
| #endif |
| |
| op = SUBREG_REG (op); |
| code = GET_CODE (op); |
| #if 0 |
| /* No longer needed, since (SUBREG (MEM...)) |
| will load the MEM into a reload reg in the MEM's own mode. */ |
| mode_altering_drug = 1; |
| #endif |
| } |
| |
| if (code == REG) |
| /* A register whose class is NO_REGS is not a general operand. */ |
| return (REGNO (op) >= FIRST_PSEUDO_REGISTER |
| || REGNO_REG_CLASS (REGNO (op)) != NO_REGS); |
| |
| if (code == MEM) |
| { |
| register rtx y = XEXP (op, 0); |
| if (! volatile_ok && MEM_VOLATILE_P (op)) |
| return 0; |
| if (GET_CODE (y) == ADDRESSOF) |
| return 1; |
| /* Use the mem's mode, since it will be reloaded thus. */ |
| mode = GET_MODE (op); |
| GO_IF_LEGITIMATE_ADDRESS (mode, y, win); |
| } |
| |
| /* Pretend this is an operand for now; we'll run force_operand |
| on its replacement in fixup_var_refs_1. */ |
| if (code == ADDRESSOF) |
| return 1; |
| |
| return 0; |
| |
| win: |
| if (mode_altering_drug) |
| return ! mode_dependent_address_p (XEXP (op, 0)); |
| return 1; |
| } |
| |
| /* Return 1 if OP is a valid memory address for a memory reference |
| of mode MODE. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. */ |
| |
| int |
| address_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| return memory_address_p (mode, op); |
| } |
| |
| /* Return 1 if OP is a register reference of mode MODE. |
| If MODE is VOIDmode, accept a register in any mode. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. |
| |
| As a special exception, registers whose class is NO_REGS are |
| not accepted by `register_operand'. The reason for this change |
| is to allow the representation of special architecture artifacts |
| (such as a condition code register) without extending the rtl |
| definitions. Since registers of class NO_REGS cannot be used |
| as registers in any case where register classes are examined, |
| it is most consistent to keep this function from accepting them. */ |
| |
| int |
| register_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| if (GET_MODE (op) != mode && mode != VOIDmode) |
| return 0; |
| |
| if (GET_CODE (op) == SUBREG) |
| { |
| /* Before reload, we can allow (SUBREG (MEM...)) as a register operand |
| because it is guaranteed to be reloaded into one. |
| Just make sure the MEM is valid in itself. |
| (Ideally, (SUBREG (MEM)...) should not exist after reload, |
| but currently it does result from (SUBREG (REG)...) where the |
| reg went on the stack.) */ |
| if (! reload_completed && GET_CODE (SUBREG_REG (op)) == MEM) |
| return general_operand (op, mode); |
| |
| #ifdef CLASS_CANNOT_CHANGE_SIZE |
| if (GET_CODE (SUBREG_REG (op)) == REG |
| && REGNO (SUBREG_REG (op)) < FIRST_PSEUDO_REGISTER |
| && TEST_HARD_REG_BIT (reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE], |
| REGNO (SUBREG_REG (op))) |
| && (GET_MODE_SIZE (mode) |
| != GET_MODE_SIZE (GET_MODE (SUBREG_REG (op)))) |
| && GET_MODE_CLASS (GET_MODE (SUBREG_REG (op))) != MODE_COMPLEX_INT |
| && GET_MODE_CLASS (GET_MODE (SUBREG_REG (op))) != MODE_COMPLEX_FLOAT) |
| return 0; |
| #endif |
| |
| op = SUBREG_REG (op); |
| } |
| |
| /* We don't consider registers whose class is NO_REGS |
| to be a register operand. */ |
| return (GET_CODE (op) == REG |
| && (REGNO (op) >= FIRST_PSEUDO_REGISTER |
| || REGNO_REG_CLASS (REGNO (op)) != NO_REGS)); |
| } |
| |
| /* Return 1 if OP should match a MATCH_SCRATCH, i.e., if it is a SCRATCH |
| or a hard register. */ |
| |
| int |
| scratch_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| return (GET_MODE (op) == mode |
| && (GET_CODE (op) == SCRATCH |
| || (GET_CODE (op) == REG |
| && REGNO (op) < FIRST_PSEUDO_REGISTER))); |
| } |
| |
| /* Return 1 if OP is a valid immediate operand for mode MODE. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. */ |
| |
| int |
| immediate_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| /* Don't accept CONST_INT or anything similar |
| if the caller wants something floating. */ |
| if (GET_MODE (op) == VOIDmode && mode != VOIDmode |
| && GET_MODE_CLASS (mode) != MODE_INT |
| && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) |
| return 0; |
| |
| /* Accept CONSTANT_P_RTX, since it will be gone by CSE1 and |
| result in 0/1. It seems a safe assumption that this is |
| in range for everyone. */ |
| if (GET_CODE (op) == CONSTANT_P_RTX) |
| return 1; |
| |
| return (CONSTANT_P (op) |
| && (GET_MODE (op) == mode || mode == VOIDmode |
| || GET_MODE (op) == VOIDmode) |
| #ifdef LEGITIMATE_PIC_OPERAND_P |
| && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) |
| #endif |
| && LEGITIMATE_CONSTANT_P (op)); |
| } |
| |
| /* Returns 1 if OP is an operand that is a CONST_INT. */ |
| |
| int |
| const_int_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode ATTRIBUTE_UNUSED; |
| { |
| return GET_CODE (op) == CONST_INT; |
| } |
| |
| /* Returns 1 if OP is an operand that is a constant integer or constant |
| floating-point number. */ |
| |
| int |
| const_double_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| /* Don't accept CONST_INT or anything similar |
| if the caller wants something floating. */ |
| if (GET_MODE (op) == VOIDmode && mode != VOIDmode |
| && GET_MODE_CLASS (mode) != MODE_INT |
| && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) |
| return 0; |
| |
| return ((GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT) |
| && (mode == VOIDmode || GET_MODE (op) == mode |
| || GET_MODE (op) == VOIDmode)); |
| } |
| |
| /* Return 1 if OP is a general operand that is not an immediate operand. */ |
| |
| int |
| nonimmediate_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| return (general_operand (op, mode) && ! CONSTANT_P (op)); |
| } |
| |
| /* Return 1 if OP is a register reference or immediate value of mode MODE. */ |
| |
| int |
| nonmemory_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| if (CONSTANT_P (op)) |
| { |
| /* Don't accept CONST_INT or anything similar |
| if the caller wants something floating. */ |
| if (GET_MODE (op) == VOIDmode && mode != VOIDmode |
| && GET_MODE_CLASS (mode) != MODE_INT |
| && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) |
| return 0; |
| |
| return ((GET_MODE (op) == VOIDmode || GET_MODE (op) == mode) |
| #ifdef LEGITIMATE_PIC_OPERAND_P |
| && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) |
| #endif |
| && LEGITIMATE_CONSTANT_P (op)); |
| } |
| |
| if (GET_MODE (op) != mode && mode != VOIDmode) |
| return 0; |
| |
| if (GET_CODE (op) == SUBREG) |
| { |
| /* Before reload, we can allow (SUBREG (MEM...)) as a register operand |
| because it is guaranteed to be reloaded into one. |
| Just make sure the MEM is valid in itself. |
| (Ideally, (SUBREG (MEM)...) should not exist after reload, |
| but currently it does result from (SUBREG (REG)...) where the |
| reg went on the stack.) */ |
| if (! reload_completed && GET_CODE (SUBREG_REG (op)) == MEM) |
| return general_operand (op, mode); |
| op = SUBREG_REG (op); |
| } |
| |
| /* We don't consider registers whose class is NO_REGS |
| to be a register operand. */ |
| return (GET_CODE (op) == REG |
| && (REGNO (op) >= FIRST_PSEUDO_REGISTER |
| || REGNO_REG_CLASS (REGNO (op)) != NO_REGS)); |
| } |
| |
| /* Return 1 if OP is a valid operand that stands for pushing a |
| value of mode MODE onto the stack. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. */ |
| |
| int |
| push_operand (op, mode) |
| rtx op; |
| enum machine_mode mode; |
| { |
| if (GET_CODE (op) != MEM) |
| return 0; |
| |
| if (mode != VOIDmode && GET_MODE (op) != mode) |
| return 0; |
| |
| op = XEXP (op, 0); |
| |
| if (GET_CODE (op) != STACK_PUSH_CODE) |
| return 0; |
| |
| return XEXP (op, 0) == stack_pointer_rtx; |
| } |
| |
| /* Return 1 if OP is a valid operand that stands for popping a |
| value of mode MODE off the stack. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. */ |
| |
| int |
| pop_operand (op, mode) |
| rtx op; |
| enum machine_mode mode; |
| { |
| if (GET_CODE (op) != MEM) |
| return 0; |
| |
| if (mode != VOIDmode && GET_MODE (op) != mode) |
| return 0; |
| |
| op = XEXP (op, 0); |
| |
| if (GET_CODE (op) != STACK_POP_CODE) |
| return 0; |
| |
| return XEXP (op, 0) == stack_pointer_rtx; |
| } |
| |
| /* Return 1 if ADDR is a valid memory address for mode MODE. */ |
| |
| int |
| memory_address_p (mode, addr) |
| enum machine_mode mode; |
| register rtx addr; |
| { |
| if (GET_CODE (addr) == ADDRESSOF) |
| return 1; |
| |
| GO_IF_LEGITIMATE_ADDRESS (mode, addr, win); |
| return 0; |
| |
| win: |
| return 1; |
| } |
| |
| /* Return 1 if OP is a valid memory reference with mode MODE, |
| including a valid address. |
| |
| The main use of this function is as a predicate in match_operand |
| expressions in the machine description. */ |
| |
| int |
| memory_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| rtx inner; |
| |
| if (! reload_completed) |
| /* Note that no SUBREG is a memory operand before end of reload pass, |
| because (SUBREG (MEM...)) forces reloading into a register. */ |
| return GET_CODE (op) == MEM && general_operand (op, mode); |
| |
| if (mode != VOIDmode && GET_MODE (op) != mode) |
| return 0; |
| |
| inner = op; |
| if (GET_CODE (inner) == SUBREG) |
| inner = SUBREG_REG (inner); |
| |
| return (GET_CODE (inner) == MEM && general_operand (op, mode)); |
| } |
| |
| /* Return 1 if OP is a valid indirect memory reference with mode MODE; |
| that is, a memory reference whose address is a general_operand. */ |
| |
| int |
| indirect_operand (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| /* Before reload, a SUBREG isn't in memory (see memory_operand, above). */ |
| if (! reload_completed |
| && GET_CODE (op) == SUBREG && GET_CODE (SUBREG_REG (op)) == MEM) |
| { |
| register int offset = SUBREG_WORD (op) * UNITS_PER_WORD; |
| rtx inner = SUBREG_REG (op); |
| |
| if (BYTES_BIG_ENDIAN) |
| offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (op))) |
| - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (inner)))); |
| |
| if (mode != VOIDmode && GET_MODE (op) != mode) |
| return 0; |
| |
| /* The only way that we can have a general_operand as the resulting |
| address is if OFFSET is zero and the address already is an operand |
| or if the address is (plus Y (const_int -OFFSET)) and Y is an |
| operand. */ |
| |
| return ((offset == 0 && general_operand (XEXP (inner, 0), Pmode)) |
| || (GET_CODE (XEXP (inner, 0)) == PLUS |
| && GET_CODE (XEXP (XEXP (inner, 0), 1)) == CONST_INT |
| && INTVAL (XEXP (XEXP (inner, 0), 1)) == -offset |
| && general_operand (XEXP (XEXP (inner, 0), 0), Pmode))); |
| } |
| |
| return (GET_CODE (op) == MEM |
| && memory_operand (op, mode) |
| && general_operand (XEXP (op, 0), Pmode)); |
| } |
| |
| /* Return 1 if this is a comparison operator. This allows the use of |
| MATCH_OPERATOR to recognize all the branch insns. */ |
| |
| int |
| comparison_operator (op, mode) |
| register rtx op; |
| enum machine_mode mode; |
| { |
| return ((mode == VOIDmode || GET_MODE (op) == mode) |
| && GET_RTX_CLASS (GET_CODE (op)) == '<'); |
| } |
| |
| /* If BODY is an insn body that uses ASM_OPERANDS, |
| return the number of operands (both input and output) in the insn. |
| Otherwise return -1. */ |
| |
| int |
| asm_noperands (body) |
| rtx body; |
| { |
| if (GET_CODE (body) == ASM_OPERANDS) |
| /* No output operands: return number of input operands. */ |
| return ASM_OPERANDS_INPUT_LENGTH (body); |
| if (GET_CODE (body) == SET && GET_CODE (SET_SRC (body)) == ASM_OPERANDS) |
| /* Single output operand: BODY is (set OUTPUT (asm_operands ...)). */ |
| return ASM_OPERANDS_INPUT_LENGTH (SET_SRC (body)) + 1; |
| else if (GET_CODE (body) == PARALLEL |
| && GET_CODE (XVECEXP (body, 0, 0)) == SET |
| && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) == ASM_OPERANDS) |
| { |
| /* Multiple output operands, or 1 output plus some clobbers: |
| body is [(set OUTPUT (asm_operands ...))... (clobber (reg ...))...]. */ |
| int i; |
| int n_sets; |
| |
| /* Count backwards through CLOBBERs to determine number of SETs. */ |
| for (i = XVECLEN (body, 0); i > 0; i--) |
| { |
| if (GET_CODE (XVECEXP (body, 0, i - 1)) == SET) |
| break; |
| if (GET_CODE (XVECEXP (body, 0, i - 1)) != CLOBBER) |
| return -1; |
| } |
| |
| /* N_SETS is now number of output operands. */ |
| n_sets = i; |
| |
| /* Verify that all the SETs we have |
| came from a single original asm_operands insn |
| (so that invalid combinations are blocked). */ |
| for (i = 0; i < n_sets; i++) |
| { |
| rtx elt = XVECEXP (body, 0, i); |
| if (GET_CODE (elt) != SET) |
| return -1; |
| if (GET_CODE (SET_SRC (elt)) != ASM_OPERANDS) |
| return -1; |
| /* If these ASM_OPERANDS rtx's came from different original insns |
| then they aren't allowed together. */ |
| if (ASM_OPERANDS_INPUT_VEC (SET_SRC (elt)) |
| != ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP (body, 0, 0)))) |
| return -1; |
| } |
| return (ASM_OPERANDS_INPUT_LENGTH (SET_SRC (XVECEXP (body, 0, 0))) |
| + n_sets); |
| } |
| else if (GET_CODE (body) == PARALLEL |
| && GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) |
| { |
| /* 0 outputs, but some clobbers: |
| body is [(asm_operands ...) (clobber (reg ...))...]. */ |
| int i; |
| |
| /* Make sure all the other parallel things really are clobbers. */ |
| for (i = XVECLEN (body, 0) - 1; i > 0; i--) |
| if (GET_CODE (XVECEXP (body, 0, i)) != CLOBBER) |
| return -1; |
| |
| return ASM_OPERANDS_INPUT_LENGTH (XVECEXP (body, 0, 0)); |
| } |
| else |
| return -1; |
| } |
| |
| /* Assuming BODY is an insn body that uses ASM_OPERANDS, |
| copy its operands (both input and output) into the vector OPERANDS, |
| the locations of the operands within the insn into the vector OPERAND_LOCS, |
| and the constraints for the operands into CONSTRAINTS. |
| Write the modes of the operands into MODES. |
| Return the assembler-template. |
| |
| If MODES, OPERAND_LOCS, CONSTRAINTS or OPERANDS is 0, |
| we don't store that info. */ |
| |
| char * |
| decode_asm_operands (body, operands, operand_locs, constraints, modes) |
| rtx body; |
| rtx *operands; |
| rtx **operand_locs; |
| const char **constraints; |
| enum machine_mode *modes; |
| { |
| register int i; |
| int noperands; |
| char *template = 0; |
| |
| if (GET_CODE (body) == SET && GET_CODE (SET_SRC (body)) == ASM_OPERANDS) |
| { |
| rtx asmop = SET_SRC (body); |
| /* Single output operand: BODY is (set OUTPUT (asm_operands ....)). */ |
| |
| noperands = ASM_OPERANDS_INPUT_LENGTH (asmop) + 1; |
| |
| for (i = 1; i < noperands; i++) |
| { |
| if (operand_locs) |
| operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i - 1); |
| if (operands) |
| operands[i] = ASM_OPERANDS_INPUT (asmop, i - 1); |
| if (constraints) |
| constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i - 1); |
| if (modes) |
| modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i - 1); |
| } |
| |
| /* The output is in the SET. |
| Its constraint is in the ASM_OPERANDS itself. */ |
| if (operands) |
| operands[0] = SET_DEST (body); |
| if (operand_locs) |
| operand_locs[0] = &SET_DEST (body); |
| if (constraints) |
| constraints[0] = ASM_OPERANDS_OUTPUT_CONSTRAINT (asmop); |
| if (modes) |
| modes[0] = GET_MODE (SET_DEST (body)); |
| template = ASM_OPERANDS_TEMPLATE (asmop); |
| } |
| else if (GET_CODE (body) == ASM_OPERANDS) |
| { |
| rtx asmop = body; |
| /* No output operands: BODY is (asm_operands ....). */ |
| |
| noperands = ASM_OPERANDS_INPUT_LENGTH (asmop); |
| |
| /* The input operands are found in the 1st element vector. */ |
| /* Constraints for inputs are in the 2nd element vector. */ |
| for (i = 0; i < noperands; i++) |
| { |
| if (operand_locs) |
| operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i); |
| if (operands) |
| operands[i] = ASM_OPERANDS_INPUT (asmop, i); |
| if (constraints) |
| constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); |
| if (modes) |
| modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i); |
| } |
| template = ASM_OPERANDS_TEMPLATE (asmop); |
| } |
| else if (GET_CODE (body) == PARALLEL |
| && GET_CODE (XVECEXP (body, 0, 0)) == SET) |
| { |
| rtx asmop = SET_SRC (XVECEXP (body, 0, 0)); |
| int nparallel = XVECLEN (body, 0); /* Includes CLOBBERs. */ |
| int nin = ASM_OPERANDS_INPUT_LENGTH (asmop); |
| int nout = 0; /* Does not include CLOBBERs. */ |
| |
| /* At least one output, plus some CLOBBERs. */ |
| |
| /* The outputs are in the SETs. |
| Their constraints are in the ASM_OPERANDS itself. */ |
| for (i = 0; i < nparallel; i++) |
| { |
| if (GET_CODE (XVECEXP (body, 0, i)) == CLOBBER) |
| break; /* Past last SET */ |
| |
| if (operands) |
| operands[i] = SET_DEST (XVECEXP (body, 0, i)); |
| if (operand_locs) |
| operand_locs[i] = &SET_DEST (XVECEXP (body, 0, i)); |
| if (constraints) |
| constraints[i] = XSTR (SET_SRC (XVECEXP (body, 0, i)), 1); |
| if (modes) |
| modes[i] = GET_MODE (SET_DEST (XVECEXP (body, 0, i))); |
| nout++; |
| } |
| |
| for (i = 0; i < nin; i++) |
| { |
| if (operand_locs) |
| operand_locs[i + nout] = &ASM_OPERANDS_INPUT (asmop, i); |
| if (operands) |
| operands[i + nout] = ASM_OPERANDS_INPUT (asmop, i); |
| if (constraints) |
| constraints[i + nout] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); |
| if (modes) |
| modes[i + nout] = ASM_OPERANDS_INPUT_MODE (asmop, i); |
| } |
| |
| template = ASM_OPERANDS_TEMPLATE (asmop); |
| } |
| else if (GET_CODE (body) == PARALLEL |
| && GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) |
| { |
| /* No outputs, but some CLOBBERs. */ |
| |
| rtx asmop = XVECEXP (body, 0, 0); |
| int nin = ASM_OPERANDS_INPUT_LENGTH (asmop); |
| |
| for (i = 0; i < nin; i++) |
| { |
| if (operand_locs) |
| operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i); |
| if (operands) |
| operands[i] = ASM_OPERANDS_INPUT (asmop, i); |
| if (constraints) |
| constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); |
| if (modes) |
| modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i); |
| } |
| |
| template = ASM_OPERANDS_TEMPLATE (asmop); |
| } |
| |
| return template; |
| } |
| |
| /* Check if an asm_operand matches it's constraints. |
| Return > 0 if ok, = 0 if bad, < 0 if inconclusive. */ |
| |
| int |
| asm_operand_ok (op, constraint) |
| rtx op; |
| const char *constraint; |
| { |
| int result = 0; |
| |
| /* Use constrain_operands after reload. */ |
| if (reload_completed) |
| abort (); |
| |
| while (*constraint) |
| { |
| switch (*constraint++) |
| { |
| case '=': |
| case '+': |
| case '*': |
| case '%': |
| case '?': |
| case '!': |
| case '#': |
| case '&': |
| case ',': |
| break; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| /* For best results, our caller should have given us the |
| proper matching constraint, but we can't actually fail |
| the check if they didn't. Indicate that results are |
| inconclusive. */ |
| result = -1; |
| break; |
| |
| case 'p': |
| if (address_operand (op, VOIDmode)) |
| return 1; |
| break; |
| |
| case 'm': |
| case 'V': /* non-offsettable */ |
| if (memory_operand (op, VOIDmode)) |
| return 1; |
| break; |
| |
| case 'o': /* offsettable */ |
| if (offsettable_nonstrict_memref_p (op)) |
| return 1; |
| break; |
| |
| case '<': |
| /* ??? Before flow, auto inc/dec insns are not supposed to exist, |
| excepting those that expand_call created. Further, on some |
| machines which do not have generalized auto inc/dec, an inc/dec |
| is not a memory_operand. |
| |
| Match any memory and hope things are resolved after reload. */ |
| |
| if (GET_CODE (op) == MEM |
| && (1 |
| || GET_CODE (XEXP (op, 0)) == PRE_DEC |
| || GET_CODE (XEXP (op, 0)) == POST_DEC)) |
| return 1; |
| break; |
| |
| case '>': |
| if (GET_CODE (op) == MEM |
| && (1 |
| || GET_CODE (XEXP (op, 0)) == PRE_INC |
| || GET_CODE (XEXP (op, 0)) == POST_INC)) |
| return 1; |
| break; |
| |
| case 'E': |
| #ifndef REAL_ARITHMETIC |
| /* Match any floating double constant, but only if |
| we can examine the bits of it reliably. */ |
| if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT |
| || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD) |
| && GET_MODE (op) != VOIDmode && ! flag_pretend_float) |
| break; |
| #endif |
| /* FALLTHRU */ |
| |
| case 'F': |
| if (GET_CODE (op) == CONST_DOUBLE) |
| return 1; |
| break; |
| |
| case 'G': |
| if (GET_CODE (op) == CONST_DOUBLE |
| && CONST_DOUBLE_OK_FOR_LETTER_P (op, 'G')) |
| return 1; |
| break; |
| case 'H': |
| if (GET_CODE (op) == CONST_DOUBLE |
| && CONST_DOUBLE_OK_FOR_LETTER_P (op, 'H')) |
| return 1; |
| break; |
| |
| case 's': |
| if (GET_CODE (op) == CONST_INT |
| || (GET_CODE (op) == CONST_DOUBLE |
| && GET_MODE (op) == VOIDmode)) |
| break; |
| /* FALLTHRU */ |
| |
| case 'i': |
| if (CONSTANT_P (op) |
| #ifdef LEGITIMATE_PIC_OPERAND_P |
| && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) |
| #endif |
| ) |
| return 1; |
| break; |
| |
| case 'n': |
| if (GET_CODE (op) == CONST_INT |
| || (GET_CODE (op) == CONST_DOUBLE |
| && GET_MODE (op) == VOIDmode)) |
| return 1; |
| break; |
| |
| case 'I': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')) |
| return 1; |
| break; |
| case 'J': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'J')) |
| return 1; |
| break; |
| case 'K': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'K')) |
| return 1; |
| break; |
| case 'L': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'L')) |
| return 1; |
| break; |
| case 'M': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'M')) |
| return 1; |
| break; |
| case 'N': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'N')) |
| return 1; |
| break; |
| case 'O': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'O')) |
| return 1; |
| break; |
| case 'P': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), 'P')) |
| return 1; |
| break; |
| |
| case 'X': |
| return 1; |
| |
| case 'g': |
| if (general_operand (op, VOIDmode)) |
| return 1; |
| break; |
| |
| #ifdef EXTRA_CONSTRAINT |
| case 'Q': |
| if (EXTRA_CONSTRAINT (op, 'Q')) |
| return 1; |
| break; |
| case 'R': |
| if (EXTRA_CONSTRAINT (op, 'R')) |
| return 1; |
| break; |
| case 'S': |
| if (EXTRA_CONSTRAINT (op, 'S')) |
| return 1; |
| break; |
| case 'T': |
| if (EXTRA_CONSTRAINT (op, 'T')) |
| return 1; |
| break; |
| case 'U': |
| if (EXTRA_CONSTRAINT (op, 'U')) |
| return 1; |
| break; |
| #endif |
| |
| case 'r': |
| default: |
| if (GET_MODE (op) == BLKmode) |
| break; |
| if (register_operand (op, VOIDmode)) |
| return 1; |
| break; |
| } |
| } |
| |
| return result; |
| } |
| |
| /* Given an rtx *P, if it is a sum containing an integer constant term, |
| return the location (type rtx *) of the pointer to that constant term. |
| Otherwise, return a null pointer. */ |
| |
| static rtx * |
| find_constant_term_loc (p) |
| rtx *p; |
| { |
| register rtx *tem; |
| register enum rtx_code code = GET_CODE (*p); |
| |
| /* If *P IS such a constant term, P is its location. */ |
| |
| if (code == CONST_INT || code == SYMBOL_REF || code == LABEL_REF |
| || code == CONST) |
| return p; |
| |
| /* Otherwise, if not a sum, it has no constant term. */ |
| |
| if (GET_CODE (*p) != PLUS) |
| return 0; |
| |
| /* If one of the summands is constant, return its location. */ |
| |
| if (XEXP (*p, 0) && CONSTANT_P (XEXP (*p, 0)) |
| && XEXP (*p, 1) && CONSTANT_P (XEXP (*p, 1))) |
| return p; |
| |
| /* Otherwise, check each summand for containing a constant term. */ |
| |
| if (XEXP (*p, 0) != 0) |
| { |
| tem = find_constant_term_loc (&XEXP (*p, 0)); |
| if (tem != 0) |
| return tem; |
| } |
| |
| if (XEXP (*p, 1) != 0) |
| { |
| tem = find_constant_term_loc (&XEXP (*p, 1)); |
| if (tem != 0) |
| return tem; |
| } |
| |
| return 0; |
| } |
| |
| /* Return 1 if OP is a memory reference |
| whose address contains no side effects |
| and remains valid after the addition |
| of a positive integer less than the |
| size of the object being referenced. |
| |
| We assume that the original address is valid and do not check it. |
| |
| This uses strict_memory_address_p as a subroutine, so |
| don't use it before reload. */ |
| |
| int |
| offsettable_memref_p (op) |
| rtx op; |
| { |
| return ((GET_CODE (op) == MEM) |
| && offsettable_address_p (1, GET_MODE (op), XEXP (op, 0))); |
| } |
| |
| /* Similar, but don't require a strictly valid mem ref: |
| consider pseudo-regs valid as index or base regs. */ |
| |
| int |
| offsettable_nonstrict_memref_p (op) |
| rtx op; |
| { |
| return ((GET_CODE (op) == MEM) |
| && offsettable_address_p (0, GET_MODE (op), XEXP (op, 0))); |
| } |
| |
| /* Return 1 if Y is a memory address which contains no side effects |
| and would remain valid after the addition of a positive integer |
| less than the size of that mode. |
| |
| We assume that the original address is valid and do not check it. |
| We do check that it is valid for narrower modes. |
| |
| If STRICTP is nonzero, we require a strictly valid address, |
| for the sake of use in reload.c. */ |
| |
| int |
| offsettable_address_p (strictp, mode, y) |
| int strictp; |
| enum machine_mode mode; |
| register rtx y; |
| { |
| register enum rtx_code ycode = GET_CODE (y); |
| register rtx z; |
| rtx y1 = y; |
| rtx *y2; |
| int (*addressp) () = (strictp ? strict_memory_address_p : memory_address_p); |
| |
| if (CONSTANT_ADDRESS_P (y)) |
| return 1; |
| |
| /* Adjusting an offsettable address involves changing to a narrower mode. |
| Make sure that's OK. */ |
| |
| if (mode_dependent_address_p (y)) |
| return 0; |
| |
| /* If the expression contains a constant term, |
| see if it remains valid when max possible offset is added. */ |
| |
| if ((ycode == PLUS) && (y2 = find_constant_term_loc (&y1))) |
| { |
| int good; |
| |
| y1 = *y2; |
| *y2 = plus_constant (*y2, GET_MODE_SIZE (mode) - 1); |
| /* Use QImode because an odd displacement may be automatically invalid |
| for any wider mode. But it should be valid for a single byte. */ |
| good = (*addressp) (QImode, y); |
| |
| /* In any case, restore old contents of memory. */ |
| *y2 = y1; |
| return good; |
| } |
| |
| if (ycode == PRE_DEC || ycode == PRE_INC |
| || ycode == POST_DEC || ycode == POST_INC) |
| return 0; |
| |
| /* The offset added here is chosen as the maximum offset that |
| any instruction could need to add when operating on something |
| of the specified mode. We assume that if Y and Y+c are |
| valid addresses then so is Y+d for all 0<d<c. */ |
| |
| z = plus_constant_for_output (y, GET_MODE_SIZE (mode) - 1); |
| |
| /* Use QImode because an odd displacement may be automatically invalid |
| for any wider mode. But it should be valid for a single byte. */ |
| return (*addressp) (QImode, z); |
| } |
| |
| /* Return 1 if ADDR is an address-expression whose effect depends |
| on the mode of the memory reference it is used in. |
| |
| Autoincrement addressing is a typical example of mode-dependence |
| because the amount of the increment depends on the mode. */ |
| |
| int |
| mode_dependent_address_p (addr) |
| rtx addr ATTRIBUTE_UNUSED; /* Maybe used in GO_IF_MODE_DEPENDENT_ADDRESS. */ |
| { |
| GO_IF_MODE_DEPENDENT_ADDRESS (addr, win); |
| return 0; |
| /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */ |
| win: ATTRIBUTE_UNUSED_LABEL |
| return 1; |
| } |
| |
| /* Return 1 if OP is a general operand |
| other than a memory ref with a mode dependent address. */ |
| |
| int |
| mode_independent_operand (op, mode) |
| enum machine_mode mode; |
| rtx op; |
| { |
| rtx addr; |
| |
| if (! general_operand (op, mode)) |
| return 0; |
| |
| if (GET_CODE (op) != MEM) |
| return 1; |
| |
| addr = XEXP (op, 0); |
| GO_IF_MODE_DEPENDENT_ADDRESS (addr, lose); |
| return 1; |
| /* Label `lose' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */ |
| lose: ATTRIBUTE_UNUSED_LABEL |
| return 0; |
| } |
| |
| /* Given an operand OP that is a valid memory reference |
| which satisfies offsettable_memref_p, |
| return a new memory reference whose address has been adjusted by OFFSET. |
| OFFSET should be positive and less than the size of the object referenced. |
| */ |
| |
| rtx |
| adj_offsettable_operand (op, offset) |
| rtx op; |
| int offset; |
| { |
| register enum rtx_code code = GET_CODE (op); |
| |
| if (code == MEM) |
| { |
| register rtx y = XEXP (op, 0); |
| register rtx new; |
| |
| if (CONSTANT_ADDRESS_P (y)) |
| { |
| new = gen_rtx_MEM (GET_MODE (op), plus_constant_for_output (y, offset)); |
| RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (op); |
| return new; |
| } |
| |
| if (GET_CODE (y) == PLUS) |
| { |
| rtx z = y; |
| register rtx *const_loc; |
| |
| op = copy_rtx (op); |
| z = XEXP (op, 0); |
| const_loc = find_constant_term_loc (&z); |
| if (const_loc) |
| { |
| *const_loc = plus_constant_for_output (*const_loc, offset); |
| return op; |
| } |
| } |
| |
| new = gen_rtx_MEM (GET_MODE (op), plus_constant_for_output (y, offset)); |
| RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (op); |
| return new; |
| } |
| abort (); |
| } |
| |
| /* Analyze INSN and compute the variables recog_n_operands, recog_n_dups, |
| recog_n_alternatives, recog_operand, recog_operand_loc, recog_constraints, |
| recog_operand_mode, recog_dup_loc and recog_dup_num. |
| If REGISTER_CONSTRAINTS is not defined, also compute |
| recog_operand_address_p. */ |
| void |
| extract_insn (insn) |
| rtx insn; |
| { |
| int i; |
| int icode; |
| int noperands; |
| rtx body = PATTERN (insn); |
| |
| recog_n_operands = 0; |
| recog_n_alternatives = 0; |
| recog_n_dups = 0; |
| |
| switch (GET_CODE (body)) |
| { |
| case USE: |
| case CLOBBER: |
| case ASM_INPUT: |
| case ADDR_VEC: |
| case ADDR_DIFF_VEC: |
| return; |
| |
| case SET: |
| case PARALLEL: |
| case ASM_OPERANDS: |
| recog_n_operands = noperands = asm_noperands (body); |
| if (noperands >= 0) |
| { |
| /* This insn is an `asm' with operands. */ |
| |
| /* expand_asm_operands makes sure there aren't too many operands. */ |
| if (noperands > MAX_RECOG_OPERANDS) |
| abort (); |
| |
| /* Now get the operand values and constraints out of the insn. */ |
| decode_asm_operands (body, recog_operand, recog_operand_loc, |
| recog_constraints, recog_operand_mode); |
| if (noperands > 0) |
| { |
| const char *p = recog_constraints[0]; |
| recog_n_alternatives = 1; |
| while (*p) |
| recog_n_alternatives += (*p++ == ','); |
| } |
| #ifndef REGISTER_CONSTRAINTS |
| bzero (recog_operand_address_p, sizeof recog_operand_address_p); |
| #endif |
| break; |
| } |
| |
| /* FALLTHROUGH */ |
| |
| default: |
| /* Ordinary insn: recognize it, get the operands via insn_extract |
| and get the constraints. */ |
| |
| icode = recog_memoized (insn); |
| if (icode < 0) |
| fatal_insn_not_found (insn); |
| |
| recog_n_operands = noperands = insn_n_operands[icode]; |
| recog_n_alternatives = insn_n_alternatives[icode]; |
| recog_n_dups = insn_n_dups[icode]; |
| |
| insn_extract (insn); |
| |
| for (i = 0; i < noperands; i++) |
| { |
| #ifdef REGISTER_CONSTRAINTS |
| recog_constraints[i] = insn_operand_constraint[icode][i]; |
| #else |
| recog_operand_address_p[i] = insn_operand_address_p[icode][i]; |
| #endif |
| recog_operand_mode[i] = insn_operand_mode[icode][i]; |
| } |
| } |
| for (i = 0; i < noperands; i++) |
| recog_op_type[i] = (recog_constraints[i][0] == '=' ? OP_OUT |
| : recog_constraints[i][0] == '+' ? OP_INOUT |
| : OP_IN); |
| |
| if (recog_n_alternatives > MAX_RECOG_ALTERNATIVES) |
| abort (); |
| } |
| |
| /* After calling extract_insn, you can use this function to extract some |
| information from the constraint strings into a more usable form. |
| The collected data is stored in recog_op_alt. */ |
| void |
| preprocess_constraints () |
| { |
| int i; |
| |
| for (i = 0; i < recog_n_operands; i++) |
| { |
| int j; |
| struct operand_alternative *op_alt; |
| const char *p = recog_constraints[i]; |
| |
| op_alt = recog_op_alt[i]; |
| |
| for (j = 0; j < recog_n_alternatives; j++) |
| { |
| op_alt[j].class = NO_REGS; |
| op_alt[j].constraint = p; |
| op_alt[j].matches = -1; |
| op_alt[j].matched = -1; |
| |
| if (*p == '\0' || *p == ',') |
| { |
| op_alt[j].anything_ok = 1; |
| continue; |
| } |
| |
| for (;;) |
| { |
| char c = *p++; |
| if (c == '#') |
| do |
| c = *p++; |
| while (c != ',' && c != '\0'); |
| if (c == ',' || c == '\0') |
| break; |
| |
| switch (c) |
| { |
| case '=': case '+': case '*': case '%': |
| case 'E': case 'F': case 'G': case 'H': |
| case 's': case 'i': case 'n': |
| case 'I': case 'J': case 'K': case 'L': |
| case 'M': case 'N': case 'O': case 'P': |
| #ifdef EXTRA_CONSTRAINT |
| case 'Q': case 'R': case 'S': case 'T': case 'U': |
| #endif |
| /* These don't say anything we care about. */ |
| break; |
| |
| case '?': |
| op_alt[j].reject += 6; |
| break; |
| case '!': |
| op_alt[j].reject += 600; |
| break; |
| case '&': |
| op_alt[j].earlyclobber = 1; |
| break; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| op_alt[j].matches = c - '0'; |
| op_alt[op_alt[j].matches].matched = i; |
| break; |
| |
| case 'm': |
| op_alt[j].memory_ok = 1; |
| break; |
| case '<': |
| op_alt[j].decmem_ok = 1; |
| break; |
| case '>': |
| op_alt[j].incmem_ok = 1; |
| break; |
| case 'V': |
| op_alt[j].nonoffmem_ok = 1; |
| break; |
| case 'o': |
| op_alt[j].offmem_ok = 1; |
| break; |
| case 'X': |
| op_alt[j].anything_ok = 1; |
| break; |
| |
| case 'p': |
| op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) BASE_REG_CLASS]; |
| break; |
| |
| case 'g': case 'r': |
| op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) GENERAL_REGS]; |
| break; |
| |
| default: |
| op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) REG_CLASS_FROM_LETTER ((unsigned char)c)]; |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| #ifdef REGISTER_CONSTRAINTS |
| |
| /* Check the operands of an insn against the insn's operand constraints |
| and return 1 if they are valid. |
| The information about the insn's operands, constraints, operand modes |
| etc. is obtained from the global variables set up by extract_insn. |
| |
| WHICH_ALTERNATIVE is set to a number which indicates which |
| alternative of constraints was matched: 0 for the first alternative, |
| 1 for the next, etc. |
| |
| In addition, when two operands are match |
| and it happens that the output operand is (reg) while the |
| input operand is --(reg) or ++(reg) (a pre-inc or pre-dec), |
| make the output operand look like the input. |
| This is because the output operand is the one the template will print. |
| |
| This is used in final, just before printing the assembler code and by |
| the routines that determine an insn's attribute. |
| |
| If STRICT is a positive non-zero value, it means that we have been |
| called after reload has been completed. In that case, we must |
| do all checks strictly. If it is zero, it means that we have been called |
| before reload has completed. In that case, we first try to see if we can |
| find an alternative that matches strictly. If not, we try again, this |
| time assuming that reload will fix up the insn. This provides a "best |
| guess" for the alternative and is used to compute attributes of insns prior |
| to reload. A negative value of STRICT is used for this internal call. */ |
| |
| struct funny_match |
| { |
| int this, other; |
| }; |
| |
| int |
| constrain_operands (strict) |
| int strict; |
| { |
| const char *constraints[MAX_RECOG_OPERANDS]; |
| int matching_operands[MAX_RECOG_OPERANDS]; |
| int earlyclobber[MAX_RECOG_OPERANDS]; |
| register int c; |
| |
| struct funny_match funny_match[MAX_RECOG_OPERANDS]; |
| int funny_match_index; |
| |
| if (recog_n_operands == 0 || recog_n_alternatives == 0) |
| return 1; |
| |
| for (c = 0; c < recog_n_operands; c++) |
| { |
| constraints[c] = recog_constraints[c]; |
| matching_operands[c] = -1; |
| } |
| |
| which_alternative = 0; |
| |
| while (which_alternative < recog_n_alternatives) |
| { |
| register int opno; |
| int lose = 0; |
| funny_match_index = 0; |
| |
| for (opno = 0; opno < recog_n_operands; opno++) |
| { |
| register rtx op = recog_operand[opno]; |
| enum machine_mode mode = GET_MODE (op); |
| register const char *p = constraints[opno]; |
| int offset = 0; |
| int win = 0; |
| int val; |
| |
| earlyclobber[opno] = 0; |
| |
| /* A unary operator may be accepted by the predicate, but it |
| is irrelevant for matching constraints. */ |
| if (GET_RTX_CLASS (GET_CODE (op)) == '1') |
| op = XEXP (op, 0); |
| |
| if (GET_CODE (op) == SUBREG) |
| { |
| if (GET_CODE (SUBREG_REG (op)) == REG |
| && REGNO (SUBREG_REG (op)) < FIRST_PSEUDO_REGISTER) |
| offset = SUBREG_WORD (op); |
| op = SUBREG_REG (op); |
| } |
| |
| /* An empty constraint or empty alternative |
| allows anything which matched the pattern. */ |
| if (*p == 0 || *p == ',') |
| win = 1; |
| |
| while (*p && (c = *p++) != ',') |
| switch (c) |
| { |
| case '?': |
| case '!': |
| case '*': |
| case '%': |
| case '=': |
| case '+': |
| break; |
| |
| case '#': |
| /* Ignore rest of this alternative as far as |
| constraint checking is concerned. */ |
| while (*p && *p != ',') |
| p++; |
| break; |
| |
| case '&': |
| earlyclobber[opno] = 1; |
| break; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| /* This operand must be the same as a previous one. |
| This kind of constraint is used for instructions such |
| as add when they take only two operands. |
| |
| Note that the lower-numbered operand is passed first. |
| |
| If we are not testing strictly, assume that this constraint |
| will be satisfied. */ |
| if (strict < 0) |
| val = 1; |
| else |
| { |
| rtx op1 = recog_operand[c - '0']; |
| rtx op2 = recog_operand[opno]; |
| |
| /* A unary operator may be accepted by the predicate, |
| but it is irrelevant for matching constraints. */ |
| if (GET_RTX_CLASS (GET_CODE (op1)) == '1') |
| op1 = XEXP (op1, 0); |
| if (GET_RTX_CLASS (GET_CODE (op2)) == '1') |
| op2 = XEXP (op2, 0); |
| |
| val = operands_match_p (op1, op2); |
| } |
| |
| matching_operands[opno] = c - '0'; |
| matching_operands[c - '0'] = opno; |
| |
| if (val != 0) |
| win = 1; |
| /* If output is *x and input is *--x, |
| arrange later to change the output to *--x as well, |
| since the output op is the one that will be printed. */ |
| if (val == 2 && strict > 0) |
| { |
| funny_match[funny_match_index].this = opno; |
| funny_match[funny_match_index++].other = c - '0'; |
| } |
| break; |
| |
| case 'p': |
| /* p is used for address_operands. When we are called by |
| gen_reload, no one will have checked that the address is |
| strictly valid, i.e., that all pseudos requiring hard regs |
| have gotten them. */ |
| if (strict <= 0 |
| || (strict_memory_address_p (recog_operand_mode[opno], |
| op))) |
| win = 1; |
| break; |
| |
| /* No need to check general_operand again; |
| it was done in insn-recog.c. */ |
| case 'g': |
| /* Anything goes unless it is a REG and really has a hard reg |
| but the hard reg is not in the class GENERAL_REGS. */ |
| if (strict < 0 |
| || GENERAL_REGS == ALL_REGS |
| || GET_CODE (op) != REG |
| || (reload_in_progress |
| && REGNO (op) >= FIRST_PSEUDO_REGISTER) |
| || reg_fits_class_p (op, GENERAL_REGS, offset, mode)) |
| win = 1; |
| break; |
| |
| case 'r': |
| if (strict < 0 |
| || (strict == 0 |
| && GET_CODE (op) == REG |
| && REGNO (op) >= FIRST_PSEUDO_REGISTER) |
| || (strict == 0 && GET_CODE (op) == SCRATCH) |
| || (GET_CODE (op) == REG |
| && ((GENERAL_REGS == ALL_REGS |
| && REGNO (op) < FIRST_PSEUDO_REGISTER) |
| || reg_fits_class_p (op, GENERAL_REGS, |
| offset, mode)))) |
| win = 1; |
| break; |
| |
| case 'X': |
| /* This is used for a MATCH_SCRATCH in the cases when |
| we don't actually need anything. So anything goes |
| any time. */ |
| win = 1; |
| break; |
| |
| case 'm': |
| if (GET_CODE (op) == MEM |
| /* Before reload, accept what reload can turn into mem. */ |
| || (strict < 0 && CONSTANT_P (op)) |
| /* During reload, accept a pseudo */ |
| || (reload_in_progress && GET_CODE (op) == REG |
| && REGNO (op) >= FIRST_PSEUDO_REGISTER)) |
| win = 1; |
| break; |
| |
| case '<': |
| if (GET_CODE (op) == MEM |
| && (GET_CODE (XEXP (op, 0)) == PRE_DEC |
| || GET_CODE (XEXP (op, 0)) == POST_DEC)) |
| win = 1; |
| break; |
| |
| case '>': |
| if (GET_CODE (op) == MEM |
| && (GET_CODE (XEXP (op, 0)) == PRE_INC |
| || GET_CODE (XEXP (op, 0)) == POST_INC)) |
| win = 1; |
| break; |
| |
| case 'E': |
| #ifndef REAL_ARITHMETIC |
| /* Match any CONST_DOUBLE, but only if |
| we can examine the bits of it reliably. */ |
| if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT |
| || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD) |
| && GET_MODE (op) != VOIDmode && ! flag_pretend_float) |
| break; |
| #endif |
| if (GET_CODE (op) == CONST_DOUBLE) |
| win = 1; |
| break; |
| |
| case 'F': |
| if (GET_CODE (op) == CONST_DOUBLE) |
| win = 1; |
| break; |
| |
| case 'G': |
| case 'H': |
| if (GET_CODE (op) == CONST_DOUBLE |
| && CONST_DOUBLE_OK_FOR_LETTER_P (op, c)) |
| win = 1; |
| break; |
| |
| case 's': |
| if (GET_CODE (op) == CONST_INT |
| || (GET_CODE (op) == CONST_DOUBLE |
| && GET_MODE (op) == VOIDmode)) |
| break; |
| case 'i': |
| if (CONSTANT_P (op)) |
| win = 1; |
| break; |
| |
| case 'n': |
| if (GET_CODE (op) == CONST_INT |
| || (GET_CODE (op) == CONST_DOUBLE |
| && GET_MODE (op) == VOIDmode)) |
| win = 1; |
| break; |
| |
| case 'I': |
| case 'J': |
| case 'K': |
| case 'L': |
| case 'M': |
| case 'N': |
| case 'O': |
| case 'P': |
| if (GET_CODE (op) == CONST_INT |
| && CONST_OK_FOR_LETTER_P (INTVAL (op), c)) |
| win = 1; |
| break; |
| |
| #ifdef EXTRA_CONSTRAINT |
| case 'Q': |
| case 'R': |
| case 'S': |
| case 'T': |
| case 'U': |
| if (EXTRA_CONSTRAINT (op, c)) |
| win = 1; |
| break; |
| #endif |
| |
| case 'V': |
| if (GET_CODE (op) == MEM |
| && ((strict > 0 && ! offsettable_memref_p (op)) |
| || (strict < 0 |
| && !(CONSTANT_P (op) || GET_CODE (op) == MEM)) |
| || (reload_in_progress |
| && !(GET_CODE (op) == REG |
| && REGNO (op) >= FIRST_PSEUDO_REGISTER)))) |
| win = 1; |
| break; |
| |
| case 'o': |
| if ((strict > 0 && offsettable_memref_p (op)) |
| || (strict == 0 && offsettable_nonstrict_memref_p (op)) |
| /* Before reload, accept what reload can handle. */ |
| || (strict < 0 |
| && (CONSTANT_P (op) || GET_CODE (op) == MEM)) |
| /* During reload, accept a pseudo */ |
| || (reload_in_progress && GET_CODE (op) == REG |
| && REGNO (op) >= FIRST_PSEUDO_REGISTER)) |
| win = 1; |
| break; |
| |
| default: |
| if (strict < 0 |
| || (strict == 0 |
| && GET_CODE (op) == REG |
| && REGNO (op) >= FIRST_PSEUDO_REGISTER) |
| || (strict == 0 && GET_CODE (op) == SCRATCH) |
| || (GET_CODE (op) == REG |
| && reg_fits_class_p (op, REG_CLASS_FROM_LETTER (c), |
| offset, mode))) |
| win = 1; |
| } |
| |
| constraints[opno] = p; |
| /* If this operand did not win somehow, |
| this alternative loses. */ |
| if (! win) |
| lose = 1; |
| } |
| /* This alternative won; the operands are ok. |
| Change whichever operands this alternative says to change. */ |
| if (! lose) |
| { |
| int opno, eopno; |
| |
| /* See if any earlyclobber operand conflicts with some other |
| operand. */ |
| |
| if (strict > 0) |
| for (eopno = 0; eopno < recog_n_operands; eopno++) |
| /* Ignore earlyclobber operands now in memory, |
| because we would often report failure when we have |
| two memory operands, one of which was formerly a REG. */ |
| if (earlyclobber[eopno] |
| && GET_CODE (recog_operand[eopno]) == REG) |
| for (opno = 0; opno < recog_n_operands; opno++) |
| if ((GET_CODE (recog_operand[opno]) == MEM |
| || recog_op_type[opno] != OP_OUT) |
| && opno != eopno |
| /* Ignore things like match_operator operands. */ |
| && *recog_constraints[opno] != 0 |
| && ! (matching_operands[opno] == eopno |
| && operands_match_p (recog_operand[opno], |
| recog_operand[eopno])) |
| && ! safe_from_earlyclobber (recog_operand[opno], |
| recog_operand[eopno])) |
| lose = 1; |
| |
| if (! lose) |
| { |
| while (--funny_match_index >= 0) |
| { |
| recog_operand[funny_match[funny_match_index].other] |
| = recog_operand[funny_match[funny_match_index].this]; |
| } |
| |
| return 1; |
| } |
| } |
| |
| which_alternative++; |
| } |
| |
| /* If we are about to reject this, but we are not to test strictly, |
| try a very loose test. Only return failure if it fails also. */ |
| if (strict == 0) |
| return constrain_operands (-1); |
| else |
| return 0; |
| } |
| |
| /* Return 1 iff OPERAND (assumed to be a REG rtx) |
| is a hard reg in class CLASS when its regno is offset by OFFSET |
| and changed to mode MODE. |
| If REG occupies multiple hard regs, all of them must be in CLASS. */ |
| |
| int |
| reg_fits_class_p (operand, class, offset, mode) |
| rtx operand; |
| register enum reg_class class; |
| int offset; |
| enum machine_mode mode; |
| { |
| register int regno = REGNO (operand); |
| if (regno < FIRST_PSEUDO_REGISTER |
| && TEST_HARD_REG_BIT (reg_class_contents[(int) class], |
| regno + offset)) |
| { |
| register int sr; |
| regno += offset; |
| for (sr = HARD_REGNO_NREGS (regno, mode) - 1; |
| sr > 0; sr--) |
| if (! TEST_HARD_REG_BIT (reg_class_contents[(int) class], |
| regno + sr)) |
| break; |
| return sr == 0; |
| } |
| |
| return 0; |
| } |
| |
| #endif /* REGISTER_CONSTRAINTS */ |
| |
| /* Do the splitting of insns in the block B. Only try to actually split if |
| DO_SPLIT is true; otherwise, just remove nops. */ |
| |
| void |
| split_block_insns (b, do_split) |
| int b; |
| int do_split; |
| { |
| rtx insn, next; |
| |
| for (insn = BLOCK_HEAD (b);; insn = next) |
| { |
| rtx set; |
| |
| /* Can't use `next_real_insn' because that |
| might go across CODE_LABELS and short-out basic blocks. */ |
| next = NEXT_INSN (insn); |
| if (GET_CODE (insn) != INSN) |
| { |
| if (insn == BLOCK_END (b)) |
| break; |
| |
| continue; |
| } |
| |
| /* Don't split no-op move insns. These should silently disappear |
| later in final. Splitting such insns would break the code |
| that handles REG_NO_CONFLICT blocks. */ |
| set = single_set (insn); |
| if (set && rtx_equal_p (SET_SRC (set), SET_DEST (set))) |
| { |
| if (insn == BLOCK_END (b)) |
| break; |
| |
| /* Nops get in the way while scheduling, so delete them now if |
| register allocation has already been done. It is too risky |
| to try to do this before register allocation, and there are |
| unlikely to be very many nops then anyways. */ |
| if (reload_completed) |
| { |
| |
| PUT_CODE (insn, NOTE); |
| NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; |
| NOTE_SOURCE_FILE (insn) = 0; |
| } |
| |
| continue; |
| } |
| |
| if (do_split) |
| { |
| /* Split insns here to get max fine-grain parallelism. */ |
| rtx first = PREV_INSN (insn); |
| rtx notes = REG_NOTES (insn); |
| rtx last = try_split (PATTERN (insn), insn, 1); |
| |
| if (last != insn) |
| { |
| /* try_split returns the NOTE that INSN became. */ |
| first = NEXT_INSN (first); |
| #ifdef INSN_SCHEDULING |
| update_flow_info (notes, first, last, insn); |
| #endif |
| PUT_CODE (insn, NOTE); |
| NOTE_SOURCE_FILE (insn) = 0; |
| NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; |
| if (insn == BLOCK_HEAD (b)) |
| BLOCK_HEAD (b) = first; |
| if (insn == BLOCK_END (b)) |
| { |
| BLOCK_END (b) = last; |
| break; |
| } |
| } |
| } |
| |
| if (insn == BLOCK_END (b)) |
| break; |
| } |
| } |