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compare-elim.c (try_eliminate_compare): Canonicalize operation with embedded compare to [(set (reg:CCM) (compare:CCM... 

* compare-elim.c (try_eliminate_compare): Canonicalize
	operation with embedded compare to
	[(set (reg:CCM) (compare:CCM (operation) (immediate)))
	 (set (reg) (operation)].

	* config/i386/i386.c (TARGET_FLAGS_REGNUM): New define.

From-SVN: r247992
This commit is contained in:
Uros Bizjak 2017-05-12 21:04:05 +02:00 committed by Uros Bizjak
parent 88ce9dc38a
commit 4f0473fe89
3 changed files with 32 additions and 9 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2017-05-12 Uros Bizjak <ubizjak@gmail.com>
* compare-elim.c (try_eliminate_compare): Canonicalize
operation with embedded compare to
[(set (reg:CCM) (compare:CCM (operation) (immediate)))
(set (reg) (operation)].
* config/i386/i386.c (TARGET_FLAGS_REGNUM): New define.
2017-05-12 Uros Bizjak <ubizjak@gmail.com>
PR target/80723

30
gcc/compare-elim.c
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@ -45,9 +45,9 @@ along with GCC; see the file COPYING3. If not see
(3) If an insn of form (2) can usefully set the flags, there is
another pattern of the form
[(set (reg) (operation)
(set (reg:CCM) (compare:CCM (operation) (immediate)))]
[(set (reg:CCM) (compare:CCM (operation) (immediate)))
(set (reg) (operation)]
The mode CCM will be chosen as if by SELECT_CC_MODE.
Note that unlike NOTICE_UPDATE_CC, we do not handle memory operands.
@ -582,7 +582,7 @@ equivalent_reg_at_start (rtx reg, rtx_insn *end, rtx_insn *start)
static bool
try_eliminate_compare (struct comparison *cmp)
{
rtx x, flags, in_a, in_b, cmp_src;
rtx flags, in_a, in_b, cmp_src;
/* We must have found an interesting "clobber" preceding the compare. */
if (cmp->prev_clobber == NULL)
@ -628,7 +628,8 @@ try_eliminate_compare (struct comparison *cmp)
Validate that PREV_CLOBBER itself does in fact refer to IN_A. Do
recall that we've already validated the shape of PREV_CLOBBER. */
rtx_insn *insn = cmp->prev_clobber;
x = XVECEXP (PATTERN (insn), 0, 0);
rtx x = XVECEXP (PATTERN (insn), 0, 0);
if (rtx_equal_p (SET_DEST (x), in_a))
cmp_src = SET_SRC (x);
@ -666,13 +667,24 @@ try_eliminate_compare (struct comparison *cmp)
flags = gen_rtx_REG (cmp->orig_mode, targetm.flags_regnum);
/* Generate a new comparison for installation in the setter. */
x = copy_rtx (cmp_src);
x = gen_rtx_COMPARE (GET_MODE (flags), x, in_b);
x = gen_rtx_SET (flags, x);
rtx y = copy_rtx (cmp_src);
y = gen_rtx_COMPARE (GET_MODE (flags), y, in_b);
y = gen_rtx_SET (flags, y);
/* Canonicalize instruction to:
[(set (reg:CCM) (compare:CCM (operation) (immediate)))
(set (reg) (operation)] */
rtvec v = rtvec_alloc (2);
RTVEC_ELT (v, 0) = y;
RTVEC_ELT (v, 1) = x;
rtx pat = gen_rtx_PARALLEL (VOIDmode, v);
/* Succeed if the new instruction is valid. Note that we may have started
a change group within maybe_select_cc_mode, therefore we must continue. */
validate_change (insn, &XVECEXP (PATTERN (insn), 0, 1), x, true);
validate_change (insn, &PATTERN (insn), pat, true);
if (!apply_change_group ())
return false;

2
gcc/config/i386/i386.c
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@ -51826,6 +51826,8 @@ ix86_run_selftests (void)
#undef TARGET_ADDRESS_COST
#define TARGET_ADDRESS_COST ix86_address_cost
#undef TARGET_FLAGS_REGNUM
#define TARGET_FLAGS_REGNUM FLAGS_REG
#undef TARGET_FIXED_CONDITION_CODE_REGS
#define TARGET_FIXED_CONDITION_CODE_REGS ix86_fixed_condition_code_regs
#undef TARGET_CC_MODES_COMPATIBLE