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Do not fold a load into a comparison that is used by more than one place.

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The comparison will probably be folded, so this is not ok to do.
This fixed 197.parser.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19624 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-17 01:34:14 +00:00
parent e3e0fb19e9
commit cb1aa8d772
1 changed files with 8 additions and 8 deletions
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16
lib/Target/X86/X86ISelPattern.cpp
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@ -347,7 +347,7 @@ namespace {
void EmitFoldedLoad(SDOperand Op, X86AddressMode &AM); void EmitFoldedLoad(SDOperand Op, X86AddressMode &AM);
void EmitCMP(SDOperand LHS, SDOperand RHS); void EmitCMP(SDOperand LHS, SDOperand RHS, bool isOnlyUse);
bool EmitBranchCC(MachineBasicBlock *Dest, SDOperand Chain, SDOperand Cond); bool EmitBranchCC(MachineBasicBlock *Dest, SDOperand Chain, SDOperand Cond);
void EmitSelectCC(SDOperand Cond, MVT::ValueType SVT, void EmitSelectCC(SDOperand Cond, MVT::ValueType SVT,
unsigned RTrue, unsigned RFalse, unsigned RDest); unsigned RTrue, unsigned RFalse, unsigned RDest);
@ -741,7 +741,7 @@ bool ISel::EmitBranchCC(MachineBasicBlock *Dest, SDOperand Chain,
case ISD::SETUGE: Opc = X86::JAE; break; case ISD::SETUGE: Opc = X86::JAE; break;
} }
Select(Chain); Select(Chain);
EmitCMP(SetCC->getOperand(0), SetCC->getOperand(1)); EmitCMP(SetCC->getOperand(0), SetCC->getOperand(1), SetCC->hasOneUse());
BuildMI(BB, Opc, 1).addMBB(Dest); BuildMI(BB, Opc, 1).addMBB(Dest);
return false; return false;
} }
@ -798,7 +798,7 @@ bool ISel::EmitBranchCC(MachineBasicBlock *Dest, SDOperand Chain,
} }
Select(Chain); Select(Chain);
EmitCMP(SetCC->getOperand(0), SetCC->getOperand(1)); EmitCMP(SetCC->getOperand(0), SetCC->getOperand(1), SetCC->hasOneUse());
BuildMI(BB, Opc, 1).addMBB(Dest); BuildMI(BB, Opc, 1).addMBB(Dest);
if (Opc2) if (Opc2)
BuildMI(BB, Opc2, 1).addMBB(Dest); BuildMI(BB, Opc2, 1).addMBB(Dest);
@ -910,17 +910,17 @@ void ISel::EmitSelectCC(SDOperand Cond, MVT::ValueType SVT,
} }
} else { } else {
// FIXME: CMP R, 0 -> TEST R, R // FIXME: CMP R, 0 -> TEST R, R
EmitCMP(Cond.getOperand(0), Cond.getOperand(1)); EmitCMP(Cond.getOperand(0), Cond.getOperand(1), Cond.Val->hasOneUse());
std::swap(RTrue, RFalse); std::swap(RTrue, RFalse);
} }
BuildMI(BB, Opc, 2, RDest).addReg(RTrue).addReg(RFalse); BuildMI(BB, Opc, 2, RDest).addReg(RTrue).addReg(RFalse);
} }
void ISel::EmitCMP(SDOperand LHS, SDOperand RHS) { void ISel::EmitCMP(SDOperand LHS, SDOperand RHS, bool HasOneUse) {
unsigned Opc; unsigned Opc;
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(RHS)) { if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(RHS)) {
Opc = 0; Opc = 0;
if (isFoldableLoad(LHS)) { if (HasOneUse && isFoldableLoad(LHS)) {
switch (RHS.getValueType()) { switch (RHS.getValueType()) {
default: break; default: break;
case MVT::i1: case MVT::i1:
@ -959,7 +959,7 @@ void ISel::EmitCMP(SDOperand LHS, SDOperand RHS) {
} }
Opc = 0; Opc = 0;
if (isFoldableLoad(LHS)) { if (HasOneUse && isFoldableLoad(LHS)) {
switch (RHS.getValueType()) { switch (RHS.getValueType()) {
default: break; default: break;
case MVT::i1: case MVT::i1:
@ -1947,7 +1947,7 @@ unsigned ISel::SelectExpr(SDOperand N) {
return Result; return Result;
case ISD::SETCC: case ISD::SETCC:
EmitCMP(N.getOperand(0), N.getOperand(1)); EmitCMP(N.getOperand(0), N.getOperand(1), Node->hasOneUse());
EmitSetCC(BB, Result, cast<SetCCSDNode>(N)->getCondition(), EmitSetCC(BB, Result, cast<SetCCSDNode>(N)->getCondition(),
MVT::isFloatingPoint(N.getOperand(1).getValueType())); MVT::isFloatingPoint(N.getOperand(1).getValueType()));
return Result; return Result;