diff options
Diffstat (limited to 'lib/Target/TargetTransformImpl.cpp')
| -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; |