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Select DYNAMIC_STACKALLOC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25225 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-01-11 22:15:18 +00:00
parent a7dce3c6c2
commit 38262cad0a
1 changed files with 44 additions and 1 deletions
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45
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -458,6 +458,9 @@ SDOperand X86DAGToDAGISel::Select(SDOperand N) {
if (Opcode >= ISD::BUILTIN_OP_END && Opcode < X86ISD::FIRST_NUMBER)
return N; // Already selected.
std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(N);
if (CGMI != CodeGenMap.end()) return CGMI->second;
switch (Opcode) {
default: break;
@ -621,7 +624,7 @@ SDOperand X86DAGToDAGISel::Select(SDOperand N) {
SDOperand Tmp1 = CurDAG->getTargetNode(Opc, VT, Tmp0);
SDOperand InFlag = SDOperand(0,0);
SDOperand Result = CurDAG->getCopyToReg(CurDAG->getEntryNode(),
Reg, Tmp1, InFlag).getValue(1);
Reg, Tmp1, InFlag);
SDOperand Chain = Result.getValue(0);
InFlag = Result.getValue(1);
@ -696,6 +699,46 @@ SDOperand X86DAGToDAGISel::Select(SDOperand N) {
Base, Scale, Index, Disp, Chain);
return Chain;
}
case ISD::DYNAMIC_STACKALLOC: {
SDOperand Chain = N.getOperand(0);
SDOperand Size = N.getOperand(1);
SDOperand Align = N.getOperand(2);
// FIXME: We are currently ignoring the requested alignment for handling
// greater than the stack alignment. This will need to be revisited at
// some point.
if (!isa<ConstantSDNode>(Align) ||
cast<ConstantSDNode>(Align)->getValue() != 0) {
std::cerr << "Cannot allocate stack object with greater alignment than"
<< " the stack alignment yet!";
abort();
}
// FIXME: This produces crappy code. Lots of unnecessary MOV32rr to and
// from ESP.
SDOperand InFlag;
SDOperand SPVal = CurDAG->getCopyFromReg(Chain, X86::ESP, MVT::i32, InFlag);
Chain = SPVal.getValue(1);
InFlag = SPVal.getValue(2);
SDOperand Result = Select(CurDAG->getNode(X86ISD::SUB_FLAG, MVT::i32,
SPVal, Size, InFlag));
InFlag = Result.getValue(1);
// Force the result back into ESP.
Chain = CurDAG->getCopyToReg(Chain,
CurDAG->getRegister(X86::ESP, MVT::i32),
Result, InFlag);
InFlag = Chain.getValue(1);
// Copy the result back from ESP.
Result = CurDAG->getCopyFromReg(Chain, X86::ESP, MVT::i32, InFlag);
CodeGenMap[N.getValue(0)] = Result;
CodeGenMap[N.getValue(1)] = Result.getValue(1);
return Result.getValue(N.ResNo);
}
}
return SelectCode(N);