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[Bug target/59968] Unused BT patterns
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 28 Jan 2014 17:48:21 +0000
- Subject: [Bug target/59968] Unused BT patterns
- Auto-submitted: auto-generated
- References: <bug-59968-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59968
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
For
int
__attribute__((noinline))
foo1 (int x, int y)
{
x &= ~(1 << y);
return x;
}
we generate
movl %esi, %ecx
movl $-2, %eax
roll %cl, %eax
andl %edi, %eax
ret
I expect
movl %edi, %eax
btr %esi, %eax
ret