From 955cf5326680bda17d6b8aa2dc9168927af8547f Mon Sep 17 00:00:00 2001 From: Nadav Rotem Date: Sun, 11 Nov 2012 05:34:45 +0000 Subject: [PATCH] Use the isTruncFree and isZExtFree API to figure out of these operations are free. Thanks Andy! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167685 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/TargetTransformImpl.cpp | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/lib/Target/TargetTransformImpl.cpp b/lib/Target/TargetTransformImpl.cpp index c07332de329..b36e6f858f7 100644 --- a/lib/Target/TargetTransformImpl.cpp +++ b/lib/Target/TargetTransformImpl.cpp @@ -214,8 +214,16 @@ 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) + // Scalar bitcasts are usually free. + 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. -- 2.34.1