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[CodeGen] Remove constant-folding dead code. NFC.

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This code was specific to vector operations with scalar operands:
all the opcodes in FoldValue (via FoldConstantArithmetic) can't
match those criteria.

Replace it with an assert if that ever changes: at that point,
we might need to add back a splat BUILD_VECTOR.

llvm-svn: 266100
This commit is contained in:
Ahmed Bougacha 2016-04-12 18:15:39 +00:00
parent cf74ca3a3d
commit 9e606d4f83
1 changed files with 4 additions and 12 deletions
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16
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -3295,18 +3295,10 @@ SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode, SDLoc DL, EVT VT,
// Handle the case of two scalars.
if (const ConstantSDNode *Scalar1 = dyn_cast<ConstantSDNode>(Cst1)) {
if (const ConstantSDNode *Scalar2 = dyn_cast<ConstantSDNode>(Cst2)) {
if (SDValue Folded =
FoldConstantArithmetic(Opcode, DL, VT, Scalar1, Scalar2)) {
if (!VT.isVector())
return Folded;
SmallVector<SDValue, 4> Outputs;
// We may have a vector type but a scalar result. Create a splat.
Outputs.resize(VT.getVectorNumElements(), Outputs.back());
// Build a big vector out of the scalar elements we generated.
return getNode(ISD::BUILD_VECTOR, SDLoc(), VT, Outputs);
} else {
return SDValue();
}
SDValue Folded = FoldConstantArithmetic(Opcode, DL, VT, Scalar1, Scalar2);
assert((!Folded || !VT.isVector()) &&
"Can't fold vectors ops with scalar operands");
return Folded;
}
}