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Propagate debug loc info for more *_EXTEND methods.

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llvm-svn: 63437
This commit is contained in:
Bill Wendling 2009-01-30 22:33:24 +00:00
parent ca9c42acf5
commit c05f48a66d
1 changed files with 24 additions and 15 deletions
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39
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3405,14 +3405,14 @@ SDValue DAGCombiner::GetDemandedBits(SDValue V, const APInt &Mask) {
if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(V.getOperand(1))) {
// See if we can recursively simplify the LHS.
unsigned Amt = RHSC->getZExtValue();
// Watch out for shift count overflow though.
if (Amt >= Mask.getBitWidth()) break;
APInt NewMask = Mask << Amt;
SDValue SimplifyLHS = GetDemandedBits(V.getOperand(0), NewMask);
if (SimplifyLHS.getNode()) {
return DAG.getNode(ISD::SRL, V.getValueType(),
if (SimplifyLHS.getNode())
return DAG.getNode(ISD::SRL, V.getDebugLoc(), V.getValueType(),
SimplifyLHS, V.getOperand(1));
}
}
}
return SDValue();
@ -3465,6 +3465,7 @@ SDValue DAGCombiner::ReduceLoadWidth(SDNode *N) {
!cast<LoadSDNode>(N0)->isVolatile()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT PtrType = N0.getOperand(1).getValueType();
// For big endian targets, we need to adjust the offset to the pointer to
// load the correct bytes.
if (TLI.isBigEndian()) {
@ -3472,22 +3473,27 @@ SDValue DAGCombiner::ReduceLoadWidth(SDNode *N) {
unsigned EVTStoreBits = EVT.getStoreSizeInBits();
ShAmt = LVTStoreBits - EVTStoreBits - ShAmt;
}
uint64_t PtrOff = ShAmt / 8;
unsigned NewAlign = MinAlign(LN0->getAlignment(), PtrOff);
SDValue NewPtr = DAG.getNode(ISD::ADD, PtrType, LN0->getBasePtr(),
SDValue NewPtr = DAG.getNode(ISD::ADD, DebugLoc::getUnknownLoc(),
PtrType, LN0->getBasePtr(),
DAG.getConstant(PtrOff, PtrType));
AddToWorkList(NewPtr.getNode());
SDValue Load = (ExtType == ISD::NON_EXTLOAD)
? DAG.getLoad(VT, LN0->getChain(), NewPtr,
? DAG.getLoad(VT, N0.getDebugLoc(), LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset() + PtrOff,
LN0->isVolatile(), NewAlign)
: DAG.getExtLoad(ExtType, VT, LN0->getChain(), NewPtr,
: DAG.getExtLoad(ExtType, N0.getDebugLoc(), VT, LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset() + PtrOff,
EVT, LN0->isVolatile(), NewAlign);
// Replace the old load's chain with the new load's chain.
WorkListRemover DeadNodes(*this);
DAG.ReplaceAllUsesOfValueWith(N0.getValue(1), Load.getValue(1),
&DeadNodes);
// Return the new loaded value.
return Load;
}
@ -3495,7 +3501,6 @@ SDValue DAGCombiner::ReduceLoadWidth(SDNode *N) {
return SDValue();
}
SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
@ -3506,7 +3511,7 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
// fold (sext_in_reg c1) -> c1
if (isa<ConstantSDNode>(N0) || N0.getOpcode() == ISD::UNDEF)
return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0, N1);
return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(), VT, N0, N1);
// If the input is already sign extended, just drop the extension.
if (DAG.ComputeNumSignBits(N0) >= VT.getSizeInBits()-EVTBits+1)
@ -3515,7 +3520,8 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
// fold (sext_in_reg (sext_in_reg x, VT2), VT1) -> (sext_in_reg x, minVT) pt2
if (N0.getOpcode() == ISD::SIGN_EXTEND_INREG &&
EVT.bitsLT(cast<VTSDNode>(N0.getOperand(1))->getVT())) {
return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0), N1);
return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(), VT,
N0.getOperand(0), N1);
}
// fold (sext_in_reg (sext x)) -> (sext x)
@ -3524,7 +3530,7 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
if (N0.getOpcode() == ISD::SIGN_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND) {
SDValue N00 = N0.getOperand(0);
if (N00.getValueType().getSizeInBits() < EVTBits)
return DAG.getNode(ISD::SIGN_EXTEND, VT, N00, N1);
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT, N00, N1);
}
// fold (sext_in_reg x) -> (zext_in_reg x) if the sign bit is known zero.
@ -3542,8 +3548,8 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
if (NarrowLoad.getNode())
return NarrowLoad;
// fold (sext_in_reg (srl X, 24), i8) -> sra X, 24
// fold (sext_in_reg (srl X, 23), i8) -> sra X, 23 iff possible.
// fold (sext_in_reg (srl X, 24), i8) -> (sra X, 24)
// fold (sext_in_reg (srl X, 23), i8) -> (sra X, 23) iff possible.
// We already fold "(sext_in_reg (srl X, 25), i8) -> srl X, 25" above.
if (N0.getOpcode() == ISD::SRL) {
if (ConstantSDNode *ShAmt = dyn_cast<ConstantSDNode>(N0.getOperand(1)))
@ -3552,7 +3558,8 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
// extended enough.
unsigned InSignBits = DAG.ComputeNumSignBits(N0.getOperand(0));
if (VT.getSizeInBits()-(ShAmt->getZExtValue()+EVTBits) < InSignBits)
return DAG.getNode(ISD::SRA, VT, N0.getOperand(0), N0.getOperand(1));
return DAG.getNode(ISD::SRA, N->getDebugLoc(), VT,
N0.getOperand(0), N0.getOperand(1));
}
}
@ -3563,7 +3570,8 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::SEXTLOAD, EVT))) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, LN0->getChain(),
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
@ -3578,7 +3586,8 @@ SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::SEXTLOAD, EVT))) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, LN0->getChain(),
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());