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[Bug middle-end/23673] New: fold does not fold (a^b) != 0 to a != b
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 1 Sep 2005 02:31:52 -0000
- Subject: [Bug middle-end/23673] New: fold does not fold (a^b) != 0 to a != b
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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