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Fix 64 bit argument loading that straddles the args in regs / args on stack 

boundary.

llvm-svn: 21206
This commit is contained in:
Nate Begeman 2005-04-10 05:53:14 +00:00
parent c53cd501b5
commit 941a01802f
1 changed files with 15 additions and 7 deletions
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22
llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
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@ -151,14 +151,22 @@ PPC32TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
break;
case MVT::i64: ObjSize = 8;
if (!ArgLive) break;
// FIXME: can split 64b load between reg/mem if it is last arg in regs
if (GPR_remaining > 1) {
if (GPR_remaining > 0) {
SDOperand argHi, argLo;
MF.addLiveIn(GPR[GPR_idx]);
MF.addLiveIn(GPR[GPR_idx+1]);
// Copy the extracted halves into the virtual registers
SDOperand argHi = DAG.getCopyFromReg(GPR[GPR_idx], MVT::i32,
DAG.getRoot());
SDOperand argLo = DAG.getCopyFromReg(GPR[GPR_idx+1], MVT::i32, argHi);
argHi = DAG.getCopyFromReg(GPR[GPR_idx], MVT::i32, DAG.getRoot());
// If we have two or more remaining argument registers, then both halves
// of the i64 can be sourced from there. Otherwise, the lower half will
// have to come off the stack. This can happen when an i64 is preceded
// by 28 bytes of arguments.
if (GPR_remaining > 1) {
MF.addLiveIn(GPR[GPR_idx+1]);
argLo = DAG.getCopyFromReg(GPR[GPR_idx+1], MVT::i32, argHi);
} else {
int FI = MFI->CreateFixedObject(4, ArgOffset+4);
SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
argLo = DAG.getLoad(MVT::i32, DAG.getEntryNode(), FIN);
}
// Build the outgoing arg thingy
argt = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, argLo, argHi);
newroot = argLo;