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re PR target/70821 (x86_64: __atomic_fetch_add/sub() uses XADD rather than DECL in some cases)

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PR target/70821
	* config/i386/sync.md (define_peephole2 *atomic_fetch_add_cmp<mode>):
	Add new peephole2 where the first insn is *mov<mode>_or instead of
	*mov<mode>_internal.

	* gcc.target/i386/pr70821.c: New test.

From-SVN: r235586
This commit is contained in:
Jakub Jelinek 2016-04-28 19:10:14 +02:00 committed by Jakub Jelinek
parent 7ff75c4966
commit 81262dad15
4 changed files with 58 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-04-28 Jakub Jelinek <jakub@redhat.com>
PR target/70821
* config/i386/sync.md (define_peephole2 *atomic_fetch_add_cmp<mode>):
Add new peephole2 where the first insn is *mov<mode>_or instead of
*mov<mode>_internal.
2016-04-28 Segher Boesssenkool <segher@kernel.crashing.org>
* tracer.c (bb_seen): Make static.

30
gcc/config/i386/sync.md
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@ -467,6 +467,36 @@
(plus:SWI (match_dup 1)
(match_dup 2)))])])
;; Likewise, but for the -Os special case of *mov<mode>_or.
(define_peephole2
[(parallel [(set (match_operand:SWI 0 "register_operand")
(match_operand:SWI 2 "constm1_operand"))
(clobber (reg:CC FLAGS_REG))])
(parallel [(set (match_dup 0)
(unspec_volatile:SWI
[(match_operand:SWI 1 "memory_operand")
(match_operand:SI 4 "const_int_operand")]
UNSPECV_XCHG))
(set (match_dup 1)
(plus:SWI (match_dup 1)
(match_dup 0)))
(clobber (reg:CC FLAGS_REG))])
(set (reg:CCZ FLAGS_REG)
(compare:CCZ (match_dup 0)
(match_operand:SWI 3 "const_int_operand")))]
"peep2_reg_dead_p (3, operands[0])
&& (unsigned HOST_WIDE_INT) INTVAL (operands[2])
== -(unsigned HOST_WIDE_INT) INTVAL (operands[3])
&& !reg_overlap_mentioned_p (operands[0], operands[1])"
[(parallel [(set (reg:CCZ FLAGS_REG)
(compare:CCZ
(unspec_volatile:SWI [(match_dup 1) (match_dup 4)]
UNSPECV_XCHG)
(match_dup 3)))
(set (match_dup 1)
(plus:SWI (match_dup 1)
(match_dup 2)))])])
(define_insn "*atomic_fetch_add_cmp<mode>"
[(set (reg:CCZ FLAGS_REG)
(compare:CCZ

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-04-28 Jakub Jelinek <jakub@redhat.com>
PR target/70821
* gcc.target/i386/pr70821.c: New test.
2016-04-28 Bill Seurer <seurer@linux.vnet.ibm.com>
* gcc.target/powerpc/vec-adde.c: New test.

16
gcc/testsuite/gcc.target/i386/pr70821.c Normal file
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@ -0,0 +1,16 @@
/* PR target/70821 */
/* { dg-do compile } */
/* { dg-options "-Os" } */
/* { dg-additional-options "-march=i686" { target ia32 } } */
void bar (void);
void
foo (int *p)
{
if (__atomic_sub_fetch (p, 1, __ATOMIC_SEQ_CST))
bar ();
}
/* { dg-final { scan-assembler "lock;? dec" } } */
/* { dg-final { scan-assembler-not "lock;? xadd" } } */