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Scalar Bitcasts and Truncs are usually free

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167323 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-11-02 21:47:47 +00:00
parent fb60a4e823
commit 2b0c96f71f
1 changed files with 5 additions and 0 deletions
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5
lib/Target/TargetTransformImpl.cpp
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@ -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;