diff options
| author | Manman Ren <mren@apple.com> | 2012-05-07 18:06:23 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-05-07 18:06:23 +0000 |
| commit | ed57984483b9268c30c71031fca07e71b985f169 (patch) | |
| tree | 67d0c1880ab9bd3282fc83194b620a1abca336da /lib/CodeGen/LocalStackSlotAllocation.cpp | |
| parent | af97f73ca03d16ffa069af65a494d0933665ce11 (diff) | |
X86: optimization for -(x != 0)
This patch will optimize -(x != 0) on X86
FROM
cmpl $0x01,%edi
sbbl %eax,%eax
notl %eax
TO
negl %edi
sbbl %eax %eax
In order to generate negl, I added patterns in Target/X86/X86InstrCompiler.td:
def : Pat<(X86sub_flag 0, GR32:$src), (NEG32r GR32:$src)>;
rdar: 10961709
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156312 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/LocalStackSlotAllocation.cpp')
0 files changed, 0 insertions, 0 deletions