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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 | 2d1528b3584ad85f2674f7db14b6ee607da678ec (patch) | |
| tree | 9b91e1b8f151c18b011df18cdb54de2b28f5609d /lib | |
| parent | e010eb3041c03fb9bbdc16f036ff69a3bbad6dfa (diff) | |
| download | llvm-2d1528b3584ad85f2674f7db14b6ee607da678ec.tar.gz llvm-2d1528b3584ad85f2674f7db14b6ee607da678ec.tar.bz2 llvm-2d1528b3584ad85f2674f7db14b6ee607da678ec.tar.xz | |
Code Model: Improve the accuracy of the zext/sext/trunc vector cost estimation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167412 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/TargetTransformImpl.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/lib/Target/TargetTransformImpl.cpp b/lib/Target/TargetTransformImpl.cpp index 4b427a2b6d..ca0dd9a54e 100644 --- a/lib/Target/TargetTransformImpl.cpp +++ b/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 { |