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[NFC][DAG] Move isTruncateOf so that it can be used in foldBinOpIntoSelect.

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This commit is contained in:
Amaury Séchet 2023-06-05 15:32:33 +00:00
parent edd7c13dc3
commit 7988725f65
1 changed files with 33 additions and 33 deletions
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66
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2320,6 +2320,39 @@ static ConstantSDNode *getAsNonOpaqueConstant(SDValue N) {
return Const != nullptr && !Const->isOpaque() ? Const : nullptr;
}
// isTruncateOf - If N is a truncate of some other value, return true, record
// the value being truncated in Op and which of Op's bits are zero/one in Known.
// This function computes KnownBits to avoid a duplicated call to
// computeKnownBits in the caller.
static bool isTruncateOf(SelectionDAG &DAG, SDValue N, SDValue &Op,
KnownBits &Known) {
if (N->getOpcode() == ISD::TRUNCATE) {
Op = N->getOperand(0);
Known = DAG.computeKnownBits(Op);
return true;
}
if (N.getOpcode() != ISD::SETCC ||
N.getValueType().getScalarType() != MVT::i1 ||
cast<CondCodeSDNode>(N.getOperand(2))->get() != ISD::SETNE)
return false;
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
assert(Op0.getValueType() == Op1.getValueType());
if (isNullOrNullSplat(Op0))
Op = Op1;
else if (isNullOrNullSplat(Op1))
Op = Op0;
else
return false;
Known = DAG.computeKnownBits(Op);
return (Known.Zero | 1).isAllOnes();
}
/// Return true if 'Use' is a load or a store that uses N as its base pointer
/// and that N may be folded in the load / store addressing mode.
static bool canFoldInAddressingMode(SDNode *N, SDNode *Use, SelectionDAG &DAG,
@ -13223,39 +13256,6 @@ SDValue DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
return SDValue();
}
// isTruncateOf - If N is a truncate of some other value, return true, record
// the value being truncated in Op and which of Op's bits are zero/one in Known.
// This function computes KnownBits to avoid a duplicated call to
// computeKnownBits in the caller.
static bool isTruncateOf(SelectionDAG &DAG, SDValue N, SDValue &Op,
KnownBits &Known) {
if (N->getOpcode() == ISD::TRUNCATE) {
Op = N->getOperand(0);
Known = DAG.computeKnownBits(Op);
return true;
}
if (N.getOpcode() != ISD::SETCC ||
N.getValueType().getScalarType() != MVT::i1 ||
cast<CondCodeSDNode>(N.getOperand(2))->get() != ISD::SETNE)
return false;
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
assert(Op0.getValueType() == Op1.getValueType());
if (isNullOrNullSplat(Op0))
Op = Op1;
else if (isNullOrNullSplat(Op1))
Op = Op0;
else
return false;
Known = DAG.computeKnownBits(Op);
return (Known.Zero | 1).isAllOnes();
}
/// Given an extending node with a pop-count operand, if the target does not
/// support a pop-count in the narrow source type but does support it in the
/// destination type, widen the pop-count to the destination type.