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* [Bug tree-optimization/56003] New: SCEV should thread flags ^= 0x80000000 as an addition to discover an IV var.
@ 2013-01-16 13:33 hubicka at gcc dot gnu.org
2023-09-04 0:41 ` [Bug tree-optimization/56003] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: hubicka at gcc dot gnu.org @ 2013-01-16 13:33 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56003
Bug #: 56003
Summary: SCEV should thread flags ^= 0x80000000 as an addition
to discover an IV var.
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: hubicka@gcc.gnu.org
In the following testcase we fail to work out that the loop is not really
iterating after unswitching otherwise.
void my_waitpid (int flags, int wnohang)
{
while (1)
{
if (flags & 0x80000000)
{
if (wnohang)
break;
if (debug_threads)
__builtin_puts ("blocking\n");
sigsuspend ();
}
flags ^= 0x80000000;
}
}
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/56003] SCEV should thread flags ^= 0x80000000 as an addition to discover an IV var.
2013-01-16 13:33 [Bug tree-optimization/56003] New: SCEV should thread flags ^= 0x80000000 as an addition to discover an IV var hubicka at gcc dot gnu.org
@ 2023-09-04 0:41 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-04 0:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56003
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=45178
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Maybe the patch which fixed PR 45178 fixes this one too ...
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-01-16 13:33 [Bug tree-optimization/56003] New: SCEV should thread flags ^= 0x80000000 as an addition to discover an IV var hubicka at gcc dot gnu.org
2023-09-04 0:41 ` [Bug tree-optimization/56003] " pinskia at gcc dot gnu.org
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