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| author | Chad Rosier <mcrosier@apple.com> | 2012-04-27 22:33:25 +0000 |
|---|---|---|
| committer | Chad Rosier <mcrosier@apple.com> | 2012-04-27 22:33:25 +0000 |
| commit | a73b6fc51126d40e4b8830a13a9a4e9322c282a2 (patch) | |
| tree | 4456d888db159659e7f43371f66257f385c0c804 /lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp | |
| parent | 57d61de8580b85ee706dfe1cc11bfba96d46f347 (diff) | |
| download | llvm-a73b6fc51126d40e4b8830a13a9a4e9322c282a2.tar.gz llvm-a73b6fc51126d40e4b8830a13a9a4e9322c282a2.tar.bz2 llvm-a73b6fc51126d40e4b8830a13a9a4e9322c282a2.tar.xz | |
Add x86-specific DAG combine to simplify:
x == -y --> x+y == 0
x != -y --> x+y != 0
On x86, the generated code goes from
negl %esi
cmpl %esi, %edi
je .LBB0_2
to
addl %esi, %edi
je .L4
This case is correctly handled for ARM with "cmn".
Patch by Manman Ren.
rdar://11245199
PR12545
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155739 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp')
0 files changed, 0 insertions, 0 deletions