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explain that r12 is the stack pointer reg

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25336 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duraid Madina 2006-01-15 09:45:23 +00:00
parent 4fca01731a
commit 2e0348e18e
2 changed files with 5 additions and 33 deletions
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34
lib/Target/IA64/IA64ISelDAGToDAG.cpp
View File

@ -450,37 +450,6 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
case ISD::SREM:
case ISD::UREM: return SelectDIV(Op);
case ISD::DYNAMIC_STACKALLOC: {
if (!isa<ConstantSDNode>(N->getOperand(2)) ||
cast<ConstantSDNode>(N->getOperand(2))->getValue() != 0) {
std::cerr << "Cannot allocate stack object with greater alignment than"
<< " the stack alignment yet!";
abort();
}
SDOperand Chain = Select(N->getOperand(0));
SDOperand Amt = Select(N->getOperand(1));
SDOperand Reg = CurDAG->getRegister(IA64::r12, MVT::i64);
SDOperand Val = CurDAG->getCopyFromReg(Chain, IA64::r12, MVT::i64);
Chain = Val.getValue(1);
// Subtract the amount (guaranteed to be a multiple of the stack alignment)
// from the stack pointer, giving us the result pointer.
SDOperand Result = Select(CurDAG->getNode(ISD::SUB, MVT::i64, Val, Amt));
// Copy this result back into r12.
Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg, Result);
// Copy this result back out of r12 to make sure we're not using the stack
// space without decrementing the stack pointer.
Result = CurDAG->getCopyFromReg(Chain, IA64::r12, MVT::i64);
// Finally, replace the DYNAMIC_STACKALLOC with the copyfromreg.
CodeGenMap[Op.getValue(0)] = Result;
CodeGenMap[Op.getValue(1)] = Result.getValue(1);
return SDOperand(Result.Val, Op.ResNo);
}
case ISD::ConstantFP: {
SDOperand Chain = CurDAG->getEntryNode(); // this is a constant, so..
@ -501,7 +470,8 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
CurDAG->getTargetFrameIndex(FI, MVT::i64));
}
case ISD::ConstantPool: {
case ISD::ConstantPool: { // TODO: nuke the constant pool
// (ia64 doesn't need one)
Constant *C = cast<ConstantPoolSDNode>(N)->get();
SDOperand CPI = CurDAG->getTargetConstantPool(C, MVT::i64);
return CurDAG->getTargetNode(IA64::ADDL_GA, MVT::i64, // ?

4
lib/Target/IA64/IA64ISelLowering.cpp
View File

@ -84,9 +84,11 @@ IA64TargetLowering::IA64TargetLowering(TargetMachine &TM)
setOperationAction(ISD::ROTR , MVT::i64 , Expand);
setOperationAction(ISD::BSWAP, MVT::i64 , Expand); // mux @rev
// Not implemented yet.
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
setStackPointerRegisterToSaveRestore(IA64::r12);
computeRegisterProperties();