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Propagate debug loc info for MUL.

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llvm-svn: 63369
This commit is contained in:
Bill Wendling 2009-01-30 02:45:56 +00:00
parent a7791b0e4e
commit ff10c16660
1 changed files with 21 additions and 16 deletions
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37
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1287,34 +1287,36 @@ SDValue DAGCombiner::visitMUL(SDNode *N) {
return DAG.FoldConstantArithmetic(ISD::MUL, VT, N0C, N1C);
// canonicalize constant to RHS
if (N0C && !N1C)
return DAG.getNode(ISD::MUL, VT, N1, N0);
return DAG.getNode(ISD::MUL, N->getDebugLoc(), VT, N1, N0);
// fold (mul x, 0) -> 0
if (N1C && N1C->isNullValue())
return N1;
// fold (mul x, -1) -> 0-x
if (N1C && N1C->isAllOnesValue())
return DAG.getNode(ISD::SUB, VT, DAG.getConstant(0, VT), N0);
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(0, VT), N0);
// fold (mul x, (1 << c)) -> x << c
if (N1C && N1C->getAPIntValue().isPowerOf2())
return DAG.getNode(ISD::SHL, VT, N0,
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT, N0,
DAG.getConstant(N1C->getAPIntValue().logBase2(),
TLI.getShiftAmountTy()));
// fold (mul x, -(1 << c)) -> -(x << c) or (-x) << c
if (N1C && isPowerOf2_64(-N1C->getSExtValue())) {
if (N1C && isPowerOf2_64(-N1C->getSExtValue()))
// FIXME: If the input is something that is easily negated (e.g. a
// single-use add), we should put the negate there.
return DAG.getNode(ISD::SUB, VT, DAG.getConstant(0, VT),
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(0, VT),
DAG.getNode(ISD::SHL, VT, N0,
DAG.getConstant(Log2_64(-N1C->getSExtValue()),
TLI.getShiftAmountTy())));
}
// (mul (shl X, c1), c2) -> (mul X, c2 << c1)
if (N1C && N0.getOpcode() == ISD::SHL &&
isa<ConstantSDNode>(N0.getOperand(1))) {
SDValue C3 = DAG.getNode(ISD::SHL, VT, N1, N0.getOperand(1));
SDValue C3 = DAG.getNode(ISD::SHL, N->getDebugLoc(), VT,
N1, N0.getOperand(1));
AddToWorkList(C3.getNode());
return DAG.getNode(ISD::MUL, VT, N0.getOperand(0), C3);
return DAG.getNode(ISD::MUL, N->getDebugLoc(), VT,
N0.getOperand(0), C3);
}
// Change (mul (shl X, C), Y) -> (shl (mul X, Y), C) when the shift has one
@ -1331,17 +1333,20 @@ SDValue DAGCombiner::visitMUL(SDNode *N) {
Sh = N1; Y = N0;
}
if (Sh.getNode()) {
SDValue Mul = DAG.getNode(ISD::MUL, VT, Sh.getOperand(0), Y);
return DAG.getNode(ISD::SHL, VT, Mul, Sh.getOperand(1));
SDValue Mul = DAG.getNode(ISD::MUL, N->getDebugLoc(), VT,
Sh.getOperand(0), Y);
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT,
Mul, Sh.getOperand(1));
}
}
// fold (mul (add x, c1), c2) -> (add (mul x, c2), c1*c2)
if (N1C && N0.getOpcode() == ISD::ADD && N0.getNode()->hasOneUse() &&
isa<ConstantSDNode>(N0.getOperand(1))) {
return DAG.getNode(ISD::ADD, VT,
DAG.getNode(ISD::MUL, VT, N0.getOperand(0), N1),
DAG.getNode(ISD::MUL, VT, N0.getOperand(1), N1));
}
isa<ConstantSDNode>(N0.getOperand(1)))
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT,
DAG.getNode(ISD::MUL, N0.getDebugLoc(), VT,
N0.getOperand(0), N1),
DAG.getNode(ISD::MUL, N1.getDebugLoc(), VT,
N0.getOperand(1), N1));
// reassociate mul
SDValue RMUL = ReassociateOps(ISD::MUL, N->getDebugLoc(), N0, N1);