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| author | Nadav Rotem <nrotem@apple.com> | 2012-11-11 05:34:45 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-11-11 05:34:45 +0000 |
| commit | 3b99dc62a75c88178ad2a96e96f3f1efb992e59f (patch) | |
| tree | d548da10e33289b7dd6e2071b6320cf6ac3b7fc8 /llvm/lib/Target/TargetTransformImpl.cpp | |
| parent | 12930749ab7eddf827bfdb702545052d832ad525 (diff) | |
| download | bcm5719-llvm-3b99dc62a75c88178ad2a96e96f3f1efb992e59f.tar.gz bcm5719-llvm-3b99dc62a75c88178ad2a96e96f3f1efb992e59f.zip | |
Use the isTruncFree and isZExtFree API to figure out of these operations are free. Thanks Andy!
llvm-svn: 167685
Diffstat (limited to 'llvm/lib/Target/TargetTransformImpl.cpp')
| -rw-r--r-- | llvm/lib/Target/TargetTransformImpl.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/Target/TargetTransformImpl.cpp b/llvm/lib/Target/TargetTransformImpl.cpp index c07332de329..b36e6f858f7 100644 --- a/llvm/lib/Target/TargetTransformImpl.cpp +++ b/llvm/lib/Target/TargetTransformImpl.cpp @@ -214,8 +214,16 @@ 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) + // Scalar bitcasts are usually free. + if (Opcode == Instruction::BitCast) + return 0; + + if (Opcode == Instruction::Trunc && + TLI->isTruncateFree(SrcLT.second, DstLT.second)) + return 0; + + if (Opcode == Instruction::ZExt && + TLI->isZExtFree(SrcLT.second, DstLT.second)) return 0; // Just check the op cost. If the operation is legal then assume it costs 1. |
