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| author | Nadav Rotem <nrotem@apple.com> | 2012-11-05 22:20:53 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-11-05 22:20:53 +0000 |
| commit | ae79765676f5fda98cff4131be5abefc77c0317d (patch) | |
| tree | 6bcc576588fc964e86f832243b4df4c9a26c367f /llvm/lib/Target/TargetTransformImpl.cpp | |
| parent | 52be619c84d51713ccf7271c2be5dfefd04ee23a (diff) | |
| download | bcm5719-llvm-ae79765676f5fda98cff4131be5abefc77c0317d.tar.gz bcm5719-llvm-ae79765676f5fda98cff4131be5abefc77c0317d.zip | |
Code Model: Improve the accuracy of the zext/sext/trunc vector cost estimation.
llvm-svn: 167412
Diffstat (limited to 'llvm/lib/Target/TargetTransformImpl.cpp')
| -rw-r--r-- | llvm/lib/Target/TargetTransformImpl.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/llvm/lib/Target/TargetTransformImpl.cpp b/llvm/lib/Target/TargetTransformImpl.cpp index 4b427a2b6d4..ca0dd9a54ed 100644 --- a/llvm/lib/Target/TargetTransformImpl.cpp +++ b/llvm/lib/Target/TargetTransformImpl.cpp @@ -101,7 +101,7 @@ int VectorTargetTransformImpl::InstructionOpcodeToISD(unsigned Opcode) const { case AtomicRMW: return 0; case Trunc: return ISD::TRUNCATE; case ZExt: return ISD::ZERO_EXTEND; - case SExt: return ISD::SEXTLOAD; + case SExt: return ISD::SIGN_EXTEND; case FPToUI: return ISD::FP_TO_UINT; case FPToSI: return ISD::FP_TO_SINT; case UIToFP: return ISD::UINT_TO_FP; @@ -235,9 +235,17 @@ unsigned VectorTargetTransformImpl::getCastInstrCost(unsigned Opcode, Type *Dst, SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) { // Bitcast between types that are legalized to the same type are free. - if (Opcode == Instruction::BitCast) + if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc) return 0; + // Assume that Zext is done using AND. + if (Opcode == Instruction::ZExt) + return 1; + + // Assume that sext is done using SHL and SRA. + if (Opcode == Instruction::SExt) + return 2; + // Just check the op cost. If the operation is legal then assume it costs // 1 and multiply by the type-legalization overhead. if (!TLI->isOperationExpand(ISD, DstLT.second)) @@ -310,7 +318,6 @@ unsigned VectorTargetTransformImpl::getCmpSelInstrCost(unsigned Opcode, return 1; } -/// Returns the expected cost of Vector Insert and Extract. unsigned VectorTargetTransformImpl::getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) const { |
