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expmed.c (strict_volatile_bitfield_p): Fix off-by-one error.

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* expmed.c (strict_volatile_bitfield_p): Fix off-by-one error.
* gcc.dg/20141029-1.c: New.

From-SVN: r216844
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DJ Delorie 2014-10-29 12:33:42 -04:00 • committed by DJ Delorie
parent 5cf18d250f
commit 40f94f7d73
4 changed files with 37 additions and 1 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2014-10-29 DJ Delorie <dj@redhat.com>
* expmed.c (strict_volatile_bitfield_p): Fix off-by-one error.
2014-10-29 Martin Liska <mliska@suse.cz>
PR ipa/63587

2
gcc/expmed.c
View file

@ -457,7 +457,7 @@ strict_volatile_bitfield_p (rtx op0, unsigned HOST_WIDE_INT bitsize,
/* Check for cases where the C++ memory model applies. */
if (bitregion_end != 0
&& (bitnum - bitnum % modesize < bitregion_start
|| bitnum - bitnum % modesize + modesize > bitregion_end))
|| bitnum - bitnum % modesize + modesize - 1 > bitregion_end))
return false;
return true;

4
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,7 @@
2014-10-29 DJ Delorie <dj@redhat.com>
* gcc.dg/20141029-1.c: New.
2014-10-29 Martin Liska <mliska@suse.cz>
PR ipa/63587

28
gcc/testsuite/gcc.dg/20141029-1.c Normal file
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@ -0,0 +1,28 @@
/* { dg-do compile } */
/* { dg-options "-fstrict-volatile-bitfields -fdump-rtl-final" } */
#define PERIPH (*(volatile struct system_periph *)0x81234)
struct system_periph {
union {
unsigned short WORD;
struct {
unsigned short a:1;
unsigned short b:1;
unsigned short :5;
unsigned short c:1;
unsigned short :8;
} BIT;
} ALL;
};
void
foo()
{
while (1)
{
PERIPH.ALL.BIT.a = 1;
}
}
/* { dg-final { scan-rtl-dump-times "mem/v(/.)*:HI" 4 "final" } } */
/* { dg-final { cleanup-rtl-dump "final" } } */