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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.

llvm-svn: 216928
This commit is contained in:
Matt Arsenault 2014-09-02 18:33:51 +00:00
parent c90d424c3a
commit 2e1586e561
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;
ConstantFPSDNode *CN = BV->getConstantFPSplatNode(&UndefElements);
// BuildVectors can truncate their operands. Ignore that case here.
// FIXME: We blindly ignore splats which include undef which is overly
// pessimistic.
if (CN && UndefElements.none() &&
CN->getValueType(0) == N.getValueType().getScalarType())
if (CN && UndefElements.none())
return CN;
}