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explain that r12 is the stack pointer reg
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25336 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -450,37 +450,6 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
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case ISD::SREM:
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case ISD::UREM: return SelectDIV(Op);
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case ISD::DYNAMIC_STACKALLOC: {
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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 Reg = CurDAG->getRegister(IA64::r12, MVT::i64);
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SDOperand Val = CurDAG->getCopyFromReg(Chain, IA64::r12, MVT::i64);
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Chain = Val.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 = Select(CurDAG->getNode(ISD::SUB, MVT::i64, Val, Amt));
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// Copy this result back into r12.
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Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg, Result);
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// Copy this result back out of r12 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, IA64::r12, MVT::i64);
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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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case ISD::ConstantFP: {
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SDOperand Chain = CurDAG->getEntryNode(); // this is a constant, so..
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@ -501,7 +470,8 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
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CurDAG->getTargetFrameIndex(FI, MVT::i64));
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}
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case ISD::ConstantPool: {
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case ISD::ConstantPool: { // TODO: nuke the constant pool
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// (ia64 doesn't need one)
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Constant *C = cast<ConstantPoolSDNode>(N)->get();
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SDOperand CPI = CurDAG->getTargetConstantPool(C, MVT::i64);
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return CurDAG->getTargetNode(IA64::ADDL_GA, MVT::i64, // ?
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@ -84,9 +84,11 @@ IA64TargetLowering::IA64TargetLowering(TargetMachine &TM)
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setOperationAction(ISD::ROTR , MVT::i64 , Expand);
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setOperationAction(ISD::BSWAP, MVT::i64 , Expand); // mux @rev
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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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setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
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setStackPointerRegisterToSaveRestore(IA64::r12);
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computeRegisterProperties();
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