diff options
| -rw-r--r-- | lib/CodeGen/BasicTargetTransformInfo.cpp | 33 | ||||
| -rw-r--r-- | test/Transforms/LoopVectorize/ARM/gcc-examples.ll | 6 |
2 files changed, 24 insertions, 15 deletions
diff --git a/lib/CodeGen/BasicTargetTransformInfo.cpp b/lib/CodeGen/BasicTargetTransformInfo.cpp index 3892cc4dd5..59192f444e 100644 --- a/lib/CodeGen/BasicTargetTransformInfo.cpp +++ b/lib/CodeGen/BasicTargetTransformInfo.cpp @@ -241,6 +241,27 @@ unsigned BasicTTI::getCastInstrCost(unsigned Opcode, Type *Dst, std::pair<unsigned, MVT> SrcLT = TLI->getTypeLegalizationCost(Src); std::pair<unsigned, MVT> DstLT = TLI->getTypeLegalizationCost(Dst); + // Check for NOOP conversions. + if (SrcLT.first == DstLT.first && + SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) { + + // Bitcast between types that are legalized to the same type are free. + if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc) + 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; + + // If the cast is marked as legal (or promote) then assume low cost. + if (TLI->isOperationLegalOrPromote(ISD, DstLT.second)) + return 1; + // Handle scalar conversions. if (!Src->isVectorTy() && !Dst->isVectorTy()) { @@ -248,14 +269,6 @@ unsigned BasicTTI::getCastInstrCost(unsigned Opcode, Type *Dst, 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. if (!TLI->isOperationExpand(ISD, DstLT.second)) return 1; @@ -271,10 +284,6 @@ unsigned BasicTTI::getCastInstrCost(unsigned Opcode, Type *Dst, if (SrcLT.first == DstLT.first && SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) { - // Bitcast between types that are legalized to the same type are free. - if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc) - return 0; - // Assume that Zext is done using AND. if (Opcode == Instruction::ZExt) return 1; diff --git a/test/Transforms/LoopVectorize/ARM/gcc-examples.ll b/test/Transforms/LoopVectorize/ARM/gcc-examples.ll index 6af4af6ebd..6a68e81bca 100644 --- a/test/Transforms/LoopVectorize/ARM/gcc-examples.ll +++ b/test/Transforms/LoopVectorize/ARM/gcc-examples.ll @@ -35,9 +35,9 @@ define void @example1() nounwind uwtable ssp { } ;CHECK: @example10b -;CHECK: load <2 x i16> -;CHECK: sext <2 x i16> -;CHECK: store <2 x i32> +;CHECK: load <4 x i16> +;CHECK: sext <4 x i16> +;CHECK: store <4 x i32> ;CHECK: ret void define void @example10b(i16* noalias nocapture %sa, i16* noalias nocapture %sb, i16* noalias nocapture %sc, i32* noalias nocapture %ia, i32* noalias nocapture %ib, i32* noalias nocapture %ic) nounwind uwtable ssp { br label %1 |