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re PR target/57018 (Miscompilation of bison 2.7.1 under "-Os -fomit-frame-pointer") 

2013-04-22  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/57018
	* lra-eliminations.c (mark_not_eliminable): Prevent elimination of
	a set sp if no stack realignment.

2013-04-22  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/57018
	* gcc.target/i386/pr57018.c: New test.

From-SVN: r198140
This commit is contained in:
Vladimir Makarov 2013-04-22 14:26:51 +00:00 committed by Vladimir Makarov
parent 92be22dc74
commit 88a581daa7
4 changed files with 45 additions and 1 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2013-04-22 Vladimir Makarov <vmakarov@redhat.com>
PR target/57018
* lra-eliminations.c (mark_not_eliminable): Prevent elimination of
a set sp if no stack realignment.
2013-04-22 Nick Clifton <nickc@redhat.com>
* config.gcc (tilegx-linux): Extend extra_objs rather than

4
gcc/lra-eliminations.c
View File

@ -716,7 +716,9 @@ mark_not_eliminable (rtx x)
ep++)
if (ep->to_rtx == SET_DEST (x)
&& SET_DEST (x) != hard_frame_pointer_rtx
&& (GET_CODE (SET_SRC (x)) != PLUS
&& (! (SUPPORTS_STACK_ALIGNMENT && stack_realign_fp
&& REGNO (ep->to_rtx) == STACK_POINTER_REGNUM)
|| GET_CODE (SET_SRC (x)) != PLUS
|| XEXP (SET_SRC (x), 0) != SET_DEST (x)
|| ! CONST_INT_P (XEXP (SET_SRC (x), 1))))
setup_can_eliminate (ep, false);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2013-04-22 Vladimir Makarov <vmakarov@redhat.com>
PR target/57018
* gcc.target/i386/pr57018.c: New test.
2013-04-22 James Greenhalgh <james.greenhalgh@arm.com>
* gcc.target/aarch64/vrecps.c: New.

31
gcc/testsuite/gcc.target/i386/pr57018.c Normal file
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@ -0,0 +1,31 @@
/* { dg-do run } */
/* { dg-options "-Os -fomit-frame-pointer -fno-asynchronous-unwind-tables" } */
/* { dg-additional-options "-march=i686" { target ia32 } } */
struct A { char a[16]; } a;
void __attribute__((noinline, noclone))
foo (struct A b)
{
if (__builtin_memcmp (b.a, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
__builtin_abort ();
asm volatile ("" : : : "memory");
}
void __attribute__((noinline, noclone))
bar (struct A b)
{
foo (a);
a = b;
}
int
main ()
{
struct A b = { "\0\1\2\3\4\5\6\7\10\11\12\13\14\15\16\17" };
bar (b);
if (__builtin_memcmp (a.a, b.a, 16))
__builtin_abort ();
return 0;
}