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| author | Bill Wendling <isanbard@gmail.com> | 2010-08-06 01:32:48 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2010-08-06 01:32:48 +0000 |
| commit | e4ddbdfd3cf031034020671d03626f0373fbd5ca (patch) | |
| tree | 6f2a410521d3378fe204476415e5ba036c7ed9dc /include/llvm/CodeGen | |
| parent | 5759b9b8be05293e848308f01c6eeff70d2ce15d (diff) | |
| download | external_llvm-e4ddbdfd3cf031034020671d03626f0373fbd5ca.zip external_llvm-e4ddbdfd3cf031034020671d03626f0373fbd5ca.tar.gz external_llvm-e4ddbdfd3cf031034020671d03626f0373fbd5ca.tar.bz2 | |
Add the Optimize Compares pass (disabled by default).
This pass tries to remove comparison instructions when possible. For instance,
if you have this code:
sub r1, 1
cmp r1, 0
bz L1
and "sub" either sets the same flag as the "cmp" instruction or could be
converted to set the same flag, then we can eliminate the "cmp" instruction all
together. This is a important for ARM where the ALU instructions could set the
CPSR flag, but need a special suffix ('s') to do so.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110423 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/CodeGen')
| -rw-r--r-- | include/llvm/CodeGen/Passes.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/Passes.h b/include/llvm/CodeGen/Passes.h index c881d74..0fcdf7a 100644 --- a/include/llvm/CodeGen/Passes.h +++ b/include/llvm/CodeGen/Passes.h @@ -180,6 +180,10 @@ namespace llvm { /// to take advantage of opportunities created during DAG legalization. FunctionPass *createOptimizePHIsPass(); + /// createOptimizeCmpsPass - This pass performs redundant comparison removal + /// optimization. + FunctionPass *createOptimizeCmpsPass(); + /// createStackSlotColoringPass - This pass performs stack slot coloring. FunctionPass *createStackSlotColoringPass(bool); |