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re PR rtl-optimization/47698 (CMOV accessing volatile memory with read side effect) 

gcc/
	PR rtl-optimization/47698
	* ifconv.c (noce_operand_ok): prevent CMOV generation
	for volatile mem.

gcc/testsuite/
	PR rtl-optimization/47698
	* gcc.target/i386/47698.c: New test.

From-SVN: r181075
This commit is contained in:
Sergey Ostanevich 2011-11-07 08:41:55 +00:00 committed by Kirill Yukhin
parent f7a57cdc35
commit b3242a4c75
4 changed files with 25 additions and 3 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2011-11-07 Sergey Ostanevich <sergos.gnu@gmail.com>
PR rtl-optimization/47698
* ifconv.c (noce_operand_ok): prevent CMOV generation
for volatile mem.
2011-11-07 Tristan Gingold <gingold@adacore.com>
* common/config/alpha/alpha-common.c (alpha_option_init_struct):

6
gcc/ifcvt.c
View File

@ -2329,12 +2329,12 @@ noce_operand_ok (const_rtx op)
{
/* We special-case memories, so handle any of them with
no address side effects. */
if (MEM_P (op))
return ! side_effects_p (XEXP (op, 0));
if (side_effects_p (op))
return FALSE;
if (MEM_P (op))
return ! side_effects_p (XEXP (op, 0));
return ! may_trap_p (op);
}

6
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,9 @@
2011-11-07 Sergey Ostanevich <sergos.gnu@gmail.com>
PR rtl-optimization/47698
* gcc.target/i386/47698.c: New test.
2011-11-06 Jason Merrill <jason@redhat.com>
PR c++/35688

10
gcc/testsuite/gcc.target/i386/47698.c Normal file
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@ -0,0 +1,10 @@
/* { dg-options "-Os" } */
/* { dg-final { scan-assembler-not "cmov" } } */
extern volatile unsigned long mmio;
unsigned long foo(int cond)
{
if (cond)
return mmio;
return 0;
}