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re PR target/66922 (wrong code for bit-field struct at -O1 and above on x86_64-linux-gnu) 

PR target/66922
	* config/i386/i386.c (ix86_expand_pextr): Reject extractions
	from misaligned positions.
	(ix86_expand_pinsr): Reject insertions to misaligned positions.

testsuite/ChangeLog:

	PR target/66922
	* gcc.target/i386/pr66922.c: New test.

From-SVN: r225980
This commit is contained in:
Uros Bizjak 2015-07-18 11:50:37 +02:00 committed by Uros Bizjak
parent 49b8fe6c1a
commit ab22883b70
4 changed files with 43 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2015-07-18 Uros Bizjak <ubizjak@gmail.com>
PR target/66922
* config/i386/i386.c (ix86_expand_pextr): Reject extractions
from misaligned positions.
(ix86_expand_pinsr): Reject insertions to misaligned positions.
2015-07-18 Sebastian Pop <s.pop@samsung.com>
PR middle-end/46851

8
gcc/config/i386/i386.c
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@ -50591,6 +50591,10 @@ ix86_expand_pextr (rtx *operands)
return false;
}
/* Reject extractions from misaligned positions. */
if (pos & (size-1))
return false;
if (GET_MODE (dst) == dstmode)
d = dst;
else
@ -50687,6 +50691,10 @@ ix86_expand_pinsr (rtx *operands)
return false;
}
/* Reject insertions to misaligned positions. */
if (pos & (size-1))
return false;
if (GET_CODE (src) == SUBREG)
{
unsigned int srcpos = SUBREG_BYTE (src);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2015-07-18 Uros Bizjak <ubizjak@gmail.com>
PR target/66922
* gcc.target/i386/pr66922.c: New test.
2015-07-18 Sebastian Pop <s.pop@samsung.com>
PR middle-end/46851

23
gcc/testsuite/gcc.target/i386/pr66922.c Normal file
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@ -0,0 +1,23 @@
/* { dg-do run } */
/* { dg-options "-O1 -msse2" } */
/* { dg-require-effective-target sse2 } */
#include "sse2-check.h"
struct S
{
int:31;
int:2;
int f0:16;
int f1;
int f2;
};
static void
sse2_test (void)
{
struct S a = { 1, 0, 0 };
if (a.f0 != 1)
__builtin_abort();
}