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Use the default impl of DYNAMIC_STACKALLOC, allowing us to delete some code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25334 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -96,7 +96,6 @@ namespace {
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#include "PPCGenDAGISel.inc"
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private:
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SDOperand SelectDYNAMIC_STACKALLOC(SDOperand Op);
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SDOperand SelectADD_PARTS(SDOperand Op);
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SDOperand SelectSUB_PARTS(SDOperand Op);
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SDOperand SelectSETCC(SDOperand Op);
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@ -531,42 +530,6 @@ static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool& Inv) {
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return 0;
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}
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SDOperand PPCDAGToDAGISel::SelectDYNAMIC_STACKALLOC(SDOperand Op) {
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SDNode *N = Op.Val;
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// FIXME: We are currently ignoring the requested alignment for handling
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// greater than the stack alignment. This will need to be revisited at some
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// point. Align = N.getOperand(2);
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if (!isa<ConstantSDNode>(N->getOperand(2)) ||
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cast<ConstantSDNode>(N->getOperand(2))->getValue() != 0) {
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std::cerr << "Cannot allocate stack object with greater alignment than"
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<< " the stack alignment yet!";
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abort();
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}
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SDOperand Chain = Select(N->getOperand(0));
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SDOperand Amt = Select(N->getOperand(1));
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SDOperand R1Reg = CurDAG->getRegister(PPC::R1, MVT::i32);
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SDOperand R1Val = CurDAG->getCopyFromReg(Chain, PPC::R1, MVT::i32);
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Chain = R1Val.getValue(1);
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// Subtract the amount (guaranteed to be a multiple of the stack alignment)
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// from the stack pointer, giving us the result pointer.
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SDOperand Result = CurDAG->getTargetNode(PPC::SUBF, MVT::i32, Amt, R1Val);
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// Copy this result back into R1.
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Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, R1Reg, Result);
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// Copy this result back out of R1 to make sure we're not using the stack
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// space without decrementing the stack pointer.
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Result = CurDAG->getCopyFromReg(Chain, PPC::R1, MVT::i32);
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// Finally, replace the DYNAMIC_STACKALLOC with the copyfromreg.
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CodeGenMap[Op.getValue(0)] = Result;
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CodeGenMap[Op.getValue(1)] = Result.getValue(1);
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return SDOperand(Result.Val, Op.ResNo);
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}
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SDOperand PPCDAGToDAGISel::SelectADD_PARTS(SDOperand Op) {
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SDNode *N = Op.Val;
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@ -854,7 +817,6 @@ SDOperand PPCDAGToDAGISel::Select(SDOperand Op) {
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switch (N->getOpcode()) {
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default: break;
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case ISD::DYNAMIC_STACKALLOC: return SelectDYNAMIC_STACKALLOC(Op);
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case ISD::ADD_PARTS: return SelectADD_PARTS(Op);
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case ISD::SUB_PARTS: return SelectSUB_PARTS(Op);
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case ISD::SETCC: return SelectSETCC(Op);
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@ -110,9 +110,10 @@ PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
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setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
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setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
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// Not implemented yet.
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setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
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setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
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// Use the default implementation.
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setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
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setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
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setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
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if (TM.getSubtarget<PPCSubtarget>().is64Bit()) {
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// They also have instructions for converting between i64 and fp.
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