diff options
| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-02-24 22:46:11 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-02-24 22:46:11 +0000 |
| commit | 27361a712423283d5c1c330741ac5c93b74f9b1c (patch) | |
| tree | 329f4455be9baec9bb0efc8cb98337885b1109d1 /llvm/lib/Transforms/Utils/SimplifyCFG.cpp | |
| parent | 71337622329b5046a7a8f902a91f07cc4b0776fc (diff) | |
| download | llvm-27361a712423283d5c1c330741ac5c93b74f9b1c.zip llvm-27361a712423283d5c1c330741ac5c93b74f9b1c.tar.gz llvm-27361a712423283d5c1c330741ac5c93b74f9b1c.tar.bz2 | |
SimplifyCFG: GEPs with constant indices are cheap enough to be executed unconditionally.
llvm-svn: 126445
Diffstat (limited to 'llvm/lib/Transforms/Utils/SimplifyCFG.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyCFG.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp index fb660db..c670885 100644 --- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp @@ -247,6 +247,11 @@ static bool DominatesMergePoint(Value *V, BasicBlock *BB, if (PBB->getFirstNonPHIOrDbg() != I) return false; break; + case Instruction::GetElementPtr: + // GEPs are cheap if all indices are constant. + if (!cast<GetElementPtrInst>(I)->hasAllConstantIndices()) + return false; + break; case Instruction::Add: case Instruction::Sub: case Instruction::And: |