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Fix comment and unnecessary check for FP build_vectors.

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This was copy-paste from the integer version, but
FP build_vectors don't truncate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-09-02 18:33:51 +00:00
parent fc5b232004
commit 1c7650f67c
1 changed files with 1 additions and 5 deletions
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6
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -711,11 +711,7 @@ static ConstantFPSDNode *isConstOrConstSplatFP(SDValue N) {
BitVector UndefElements; BitVector UndefElements;
ConstantFPSDNode *CN = BV->getConstantFPSplatNode(&UndefElements); ConstantFPSDNode *CN = BV->getConstantFPSplatNode(&UndefElements);
// BuildVectors can truncate their operands. Ignore that case here. if (CN && UndefElements.none())
// FIXME: We blindly ignore splats which include undef which is overly
// pessimistic.
if (CN && UndefElements.none() &&
CN->getValueType(0) == N.getValueType().getScalarType())
return CN; return CN;
} }