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* [Bug middle-end/23673] New: fold does not fold (a^b) != 0 to a != b
@ 2005-09-01 2:31 pinskia at gcc dot gnu dot org
2005-09-17 2:12 ` [Bug middle-end/23673] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-01 2:31 UTC (permalink / raw)
To: gcc-bugs
These two functions should be the same on the tree level but are not:
int f(int a, int b)
{
return (a^b) != 0;
}
int f1(int a, int b)
{
return a != b;
}
They do result in the same asm though.
Another one from LLVM.
--
Summary: fold does not fold (a^b) != 0 to a != b
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization, TREE
Severity: enhancement
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23673
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug middle-end/23673] fold does not fold (a^b) != 0 to a != b
2005-09-01 2:31 [Bug middle-end/23673] New: fold does not fold (a^b) != 0 to a != b pinskia at gcc dot gnu dot org
@ 2005-09-17 2:12 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-17 2:12 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-17 02:12 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-09-17 02:12:09
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23673
^ permalink raw reply [flat|nested] 2+ messages in thread
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2005-09-01 2:31 [Bug middle-end/23673] New: fold does not fold (a^b) != 0 to a != b pinskia at gcc dot gnu dot org
2005-09-17 2:12 ` [Bug middle-end/23673] " pinskia at gcc dot gnu dot org
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