// Set of already processed instructions in the current block.
SmallPtrSet<MachineInstr*, 8> Processed;
+ // Set of instructions converted to three-address by target and then sunk
+ // down current basic block.
+ SmallPtrSet<MachineInstr*, 8> SunkInstrs;
+
// A map from virtual registers to physical registers which are likely targets
// to be coalesced to due to copies from physical registers to virtual
// registers. e.g. v1024 = move r0.
mi = NewMI;
nmi = std::next(mi);
}
+ else
+ SunkInstrs.insert(NewMI);
// Update source and destination register maps.
SrcRegMap.erase(RegA);
SrcRegMap.clear();
DstRegMap.clear();
Processed.clear();
+ SunkInstrs.clear();
for (MachineBasicBlock::iterator mi = MBB->begin(), me = MBB->end();
mi != me; ) {
MachineBasicBlock::iterator nmi = std::next(mi);
- if (mi->isDebugValue()) {
+ // Don't revisit an instruction previously converted by target. It may
+ // contain undef register operands (%noreg), which are not handled.
+ if (mi->isDebugValue() || SunkInstrs.count(&*mi)) {
mi = nmi;
continue;
}