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Propagate debug loc info for AND. Also clean up some comments. 

llvm-svn: 63416
This commit is contained in:
Bill Wendling 2009-01-30 20:43:18 +00:00
parent 22b43cdc05
commit 8617191302
1 changed files with 31 additions and 21 deletions
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52
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1802,8 +1802,8 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
APInt Mask = ~N1C->getAPIntValue();
Mask.trunc(N0Op0.getValueSizeInBits());
if (DAG.MaskedValueIsZero(N0Op0, Mask)) {
SDValue Zext = DAG.getNode(ISD::ZERO_EXTEND, N0.getValueType(),
N0Op0);
SDValue Zext = DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(),
N0.getValueType(), N0Op0);
// Replace uses of the AND with uses of the Zero extend node.
CombineTo(N, Zext);
@ -1822,23 +1822,26 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
if (LR == RR && isa<ConstantSDNode>(LR) && Op0 == Op1 &&
LL.getValueType().isInteger()) {
// fold (X == 0) & (Y == 0) -> (X|Y == 0)
// fold (and (seteq X, 0), (seteq Y, 0)) -> (seteq (or X, Y), 0)
if (cast<ConstantSDNode>(LR)->isNullValue() && Op1 == ISD::SETEQ) {
SDValue ORNode = DAG.getNode(ISD::OR, LR.getValueType(), LL, RL);
SDValue ORNode = DAG.getNode(ISD::OR, N0.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ORNode.getNode());
return DAG.getSetCC(VT, ORNode, LR, Op1);
return DAG.getSetCC(N->getDebugLoc(), VT, ORNode, LR, Op1);
}
// fold (X == -1) & (Y == -1) -> (X&Y == -1)
// fold (and (seteq X, -1), (seteq Y, -1)) -> (seteq (and X, Y), -1)
if (cast<ConstantSDNode>(LR)->isAllOnesValue() && Op1 == ISD::SETEQ) {
SDValue ANDNode = DAG.getNode(ISD::AND, LR.getValueType(), LL, RL);
SDValue ANDNode = DAG.getNode(ISD::AND, N0.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ANDNode.getNode());
return DAG.getSetCC(VT, ANDNode, LR, Op1);
return DAG.getSetCC(N->getDebugLoc(), VT, ANDNode, LR, Op1);
}
// fold (X > -1) & (Y > -1) -> (X|Y > -1)
// fold (and (setgt X, -1), (setgt Y, -1)) -> (setgt (or X, Y), -1)
if (cast<ConstantSDNode>(LR)->isAllOnesValue() && Op1 == ISD::SETGT) {
SDValue ORNode = DAG.getNode(ISD::OR, LR.getValueType(), LL, RL);
SDValue ORNode = DAG.getNode(ISD::OR, N0.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ORNode.getNode());
return DAG.getSetCC(VT, ORNode, LR, Op1);
return DAG.getSetCC(N->getDebugLoc(), VT, ORNode, LR, Op1);
}
}
// canonicalize equivalent to ll == rl
@ -1851,11 +1854,12 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
ISD::CondCode Result = ISD::getSetCCAndOperation(Op0, Op1, isInteger);
if (Result != ISD::SETCC_INVALID &&
(!LegalOperations || TLI.isCondCodeLegal(Result, LL.getValueType())))
return DAG.getSetCC(N0.getValueType(), LL, LR, Result);
return DAG.getSetCC(N->getDebugLoc(), N0.getValueType(),
LL, LR, Result);
}
}
// Simplify: and (op x...), (op y...) -> (op (and x, y))
// Simplify: (and (op x...), (op y...)) -> (op (and x, y))
if (N0.getOpcode() == N1.getOpcode()) {
SDValue Tmp = SimplifyBinOpWithSameOpcodeHands(N);
if (Tmp.getNode()) return Tmp;
@ -1877,8 +1881,9 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
BitWidth - EVT.getSizeInBits())) &&
((!LegalOperations && !LN0->isVolatile()) ||
TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT))) {
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, N0.getDebugLoc(), VT,
LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
AddToWorkList(N);
@ -1898,7 +1903,8 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
BitWidth - EVT.getSizeInBits())) &&
((!LegalOperations && !LN0->isVolatile()) ||
TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT))) {
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(),
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, N0.getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
@ -1922,11 +1928,13 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
EVT = MVT::getIntegerVT(ActiveBits);
MVT LoadedVT = LN0->getMemoryVT();
// Do not generate loads of non-round integer types since these can
// be expensive (and would be wrong if the type is not byte sized).
if (EVT != MVT::Other && LoadedVT.bitsGT(EVT) && EVT.isRound() &&
(!LegalOperations || TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT))) {
MVT PtrType = N0.getOperand(1).getValueType();
// For big endian targets, we need to add an offset to the pointer to
// load the correct bytes. For little endian systems, we merely need to
// read fewer bytes from the same pointer.
@ -1935,16 +1943,18 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
unsigned PtrOff = LVTStoreBytes - EVTStoreBytes;
unsigned Alignment = LN0->getAlignment();
SDValue NewPtr = LN0->getBasePtr();
if (TLI.isBigEndian()) {
NewPtr = DAG.getNode(ISD::ADD, PtrType, NewPtr,
DAG.getConstant(PtrOff, PtrType));
NewPtr = DAG.getNode(ISD::ADD, DebugLoc::getUnknownLoc(), PtrType,
NewPtr, DAG.getConstant(PtrOff, PtrType));
Alignment = MinAlign(Alignment, PtrOff);
}
AddToWorkList(NewPtr.getNode());
SDValue Load =
DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), Alignment);
DAG.getExtLoad(ISD::ZEXTLOAD, LN0->getDebugLoc(), VT, LN0->getChain(),
NewPtr, LN0->getSrcValue(), LN0->getSrcValueOffset(),
EVT, LN0->isVolatile(), Alignment);
AddToWorkList(N);
CombineTo(N0.getNode(), Load, Load.getValue(1));
return SDValue(N, 0); // Return N so it doesn't get rechecked!