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Proper fix for PR1037: to determine is a VR is a modref, check 1) whether it is

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tied to another oeprand, 2) whether is is being tied to by another operand. So
the destination operand of a two-address MI can be correctly identified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-12-08 08:02:34 +00:00
parent 7814ad0bf3
commit 5c2a46052b
1 changed files with 4 additions and 2 deletions
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6
lib/CodeGen/VirtRegMap.cpp
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@ -97,7 +97,9 @@ void VirtRegMap::virtFolded(unsigned VirtReg, MachineInstr *OldMI,
}
ModRef MRInfo;
if (TII.getOperandConstraint(OldMI->getOpcode(), OpNo, TOI::TIED_TO)) {
const TargetInstrDescriptor *TID = OldMI->getInstrDescriptor();
if (TID->getOperandConstraint(OpNo, TOI::TIED_TO) != -1 ||
TII.findTiedToSrcOperand(TID, OpNo) != -1) {
// Folded a two-address operand.
MRInfo = isModRef;
} else if (OldMI->getOperand(OpNo).isDef()) {
@ -849,7 +851,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
// If this def is part of a two-address operand, make sure to execute
// the store from the correct physical register.
unsigned PhysReg;
int TiedOp = TII->findTiedToSrcOperand(MI.getOpcode(), i);
int TiedOp = TII->findTiedToSrcOperand(MI.getInstrDescriptor(), i);
if (TiedOp != -1)
PhysReg = MI.getOperand(TiedOp).getReg();
else {