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| author | Nadav Rotem <nrotem@apple.com> | 2012-11-02 21:47:47 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-11-02 21:47:47 +0000 |
| commit | 2b0c96f71ff1f26617dd805cafa35bf9a29c5a60 (patch) | |
| tree | ae8242f8404bf1d1a7e34b4543d1361c570d4270 /lib | |
| parent | fb60a4e823b46f459cd6d7951b98cbeb3b29f310 (diff) | |
| download | external_llvm-2b0c96f71ff1f26617dd805cafa35bf9a29c5a60.zip external_llvm-2b0c96f71ff1f26617dd805cafa35bf9a29c5a60.tar.gz external_llvm-2b0c96f71ff1f26617dd805cafa35bf9a29c5a60.tar.bz2 | |
Scalar Bitcasts and Truncs are usually free
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167323 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/TargetTransformImpl.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/TargetTransformImpl.cpp b/lib/Target/TargetTransformImpl.cpp index dbbf37a..4cd07cd 100644 --- a/lib/Target/TargetTransformImpl.cpp +++ b/lib/Target/TargetTransformImpl.cpp @@ -213,6 +213,11 @@ unsigned VectorTargetTransformImpl::getCastInstrCost(unsigned Opcode, Type *Dst, // Handle scalar conversions. if (!Src->isVectorTy() && !Dst->isVectorTy()) { + + // Scalar bitcasts and truncs are usually free. + if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc) + return 0; + // Just check the op cost. If the operation is legal then assume it costs 1. if (!TLI->isOperationExpand(ISD, DstLT.second)) return 1; |