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Never rely on ReplaceAllUsesWith when selecting, use CodeGenMap instead.

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ReplaceAllUsesWith does not replace scalars SDOperand floating around on
the stack, permitting things to be selected multiple times.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23515 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-29 00:59:32 +00:00
parent 79d0e9f3d1
commit d3d2cf52bb
1 changed files with 29 additions and 34 deletions
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59
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -638,6 +638,10 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
N->getOpcode() < PPCISD::FIRST_NUMBER)
return Op; // Already selected.
// If this has already been converted, use it.
std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
if (CGMI != CodeGenMap.end()) return CGMI->second;
switch (N->getOpcode()) {
default: break;
case ISD::TokenFactor: {
@ -653,11 +657,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Ops);
}
if (New.Val != N) {
CurDAG->ReplaceAllUsesWith(Op, New);
N = New.Val;
}
return SDOperand(N, 0);
if (!N->hasOneUse()) CodeGenMap[Op] = New;
return New;
}
case ISD::CopyFromReg: {
SDOperand Chain = Select(N->getOperand(0));
@ -670,13 +671,10 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
SDOperand Chain = Select(N->getOperand(0));
SDOperand Reg = N->getOperand(1);
SDOperand Val = Select(N->getOperand(2));
if (Chain != N->getOperand(0) || Val != N->getOperand(2)) {
SDOperand New = CurDAG->getNode(ISD::CopyToReg, MVT::Other,
Chain, Reg, Val);
CurDAG->ReplaceAllUsesWith(Op, New);
N = New.Val;
}
return SDOperand(N, 0);
if (!N->hasOneUse()) CodeGenMap[Op] = New;
return New;
}
case ISD::UNDEF:
if (N->getValueType(0) == MVT::i32)
@ -746,7 +744,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
Result = CurDAG->getCopyFromReg(Chain, PPC::R1, MVT::i32);
// Finally, replace the DYNAMIC_STACKALLOC with the copyfromreg.
CurDAG->ReplaceAllUsesWith(N, Result.Val);
CodeGenMap[Op.getValue(0)] = Result;
CodeGenMap[Op.getValue(1)] = Result.getValue(1);
return SDOperand(Result.Val, Op.ResNo);
}
case PPCISD::FSEL:
@ -843,10 +842,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
return SDOperand(N, 0);
} else if (Imm) {
SDOperand Result = Select(BuildSDIVSequence(N));
assert(Result.ResNo == 0);
CurDAG->ReplaceAllUsesWith(Op, Result);
N = Result.Val;
return SDOperand(N, 0);
CodeGenMap[Op] = Result;
return Result;
}
}
@ -860,10 +857,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
unsigned Imm;
if (isIntImmediate(N->getOperand(1), Imm) && Imm) {
SDOperand Result = Select(BuildUDIVSequence(N));
assert(Result.ResNo == 0);
CurDAG->ReplaceAllUsesWith(Op, Result);
N = Result.Val;
return SDOperand(N, 0);
CodeGenMap[Op] = Result;
return Result;
}
CurDAG->SelectNodeTo(N, PPC::DIVWU, MVT::i32, Select(N->getOperand(0)),
@ -903,18 +898,14 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
return SDOperand(N, 0);
}
case ISD::OR:
if (SDNode *I = SelectBitfieldInsert(N)) {
CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
N = I;
return SDOperand(N, 0);
}
if (SDNode *I = SelectBitfieldInsert(N))
return CodeGenMap[Op] = SDOperand(I, 0);
if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0),
N->getOperand(1),
PPC::ORIS, PPC::ORI)) {
CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
N = I;
return SDOperand(N, 0);
}
PPC::ORIS, PPC::ORI))
return CodeGenMap[Op] = SDOperand(I, 0);
// Finally, check for the case where we are being asked to select
// 'or (not(a), b)' or 'or (a, not(b))' which can be selected as orc.
if (isOprNot(N->getOperand(0).Val))
@ -1073,7 +1064,9 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
Select(N->getOperand(3)), CarryFromLo);
Result.push_back(CarryFromLo.getValue(0));
Result.push_back(ResultHi);
CurDAG->ReplaceAllUsesWith(N, Result);
CodeGenMap[Op.getValue(0)] = Result[0];
CodeGenMap[Op.getValue(1)] = Result[1];
return Result[Op.ResNo];
}
case ISD::SUB_PARTS: {
@ -1087,7 +1080,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
RHSL, LHSL));
Result.push_back(CurDAG->getTargetNode(PPC::SUBFE, MVT::i32, RHSH, LHSH,
Result[0].getValue(1)));
CurDAG->ReplaceAllUsesWith(N, Result);
CodeGenMap[Op.getValue(0)] = Result[0];
CodeGenMap[Op.getValue(1)] = Result[1];
return Result[Op.ResNo];
}
@ -1395,7 +1389,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
}
CallResults.push_back(Chain);
CurDAG->ReplaceAllUsesWith(N, CallResults);
for (unsigned i = 0, e = CallResults.size(); i != e; ++i)
CodeGenMap[Op.getValue(i)] = CallResults[i];
return CallResults[Op.ResNo];
}
case ISD::RET: {