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[SelectionDAG] Use existing constant nodes instead of recreating them. NFC.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251990 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim 2015-11-03 22:21:38 +00:00
parent 55e87bbf66
commit cec7b16a3b
1 changed files with 6 additions and 9 deletions
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15
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -3553,7 +3553,7 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1,
assert(VT.isFloatingPoint() &&
N1.getValueType().isFloatingPoint() &&
VT.bitsLE(N1.getValueType()) &&
isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
N2C && "Invalid FP_ROUND!");
if (N1.getValueType() == VT) return N1; // noop conversion.
break;
case ISD::AssertSext:
@ -3686,15 +3686,14 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1,
return N1.getOperand(N2C->getZExtValue());
// EXTRACT_ELEMENT of a constant int is also very common.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
if (N1C) {
unsigned ElementSize = VT.getSizeInBits();
unsigned Shift = ElementSize * N2C->getZExtValue();
APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
APInt ShiftedVal = N1C->getAPIntValue().lshr(Shift);
return getConstant(ShiftedVal.trunc(ElementSize), DL, VT);
}
break;
case ISD::EXTRACT_SUBVECTOR: {
SDValue Index = N2;
case ISD::EXTRACT_SUBVECTOR:
if (VT.isSimple() && N1.getValueType().isSimple()) {
assert(VT.isVector() && N1.getValueType().isVector() &&
"Extract subvector VTs must be a vectors!");
@ -3704,9 +3703,8 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1,
assert(VT.getSimpleVT() <= N1.getSimpleValueType() &&
"Extract subvector must be from larger vector to smaller vector!");
if (isa<ConstantSDNode>(Index)) {
assert((VT.getVectorNumElements() +
cast<ConstantSDNode>(Index)->getZExtValue()
if (N2C) {
assert((VT.getVectorNumElements() + N2C->getZExtValue()
<= N1.getValueType().getVectorNumElements())
&& "Extract subvector overflow!");
}
@ -3717,7 +3715,6 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1,
}
break;
}
}
// Perform trivial constant folding.
if (SDValue SV =