public:
static char ID; // Pass identification
- OptimizePHIs() : MachineFunctionPass(&ID) {}
+ OptimizePHIs() : MachineFunctionPass(ID) {
+ initializeOptimizePHIsPass(*PassRegistry::getPassRegistry());
+ }
virtual bool runOnMachineFunction(MachineFunction &MF);
}
char OptimizePHIs::ID = 0;
+char &llvm::OptimizePHIsID = OptimizePHIs::ID;
INITIALIZE_PASS(OptimizePHIs, "opt-phis",
- "Optimize machine instruction PHIs", false, false);
-
-FunctionPass *llvm::createOptimizePHIsPass() { return new OptimizePHIs(); }
+ "Optimize machine instruction PHIs", false, false)
bool OptimizePHIs::runOnMachineFunction(MachineFunction &Fn) {
MRI = &Fn.getRegInfo();
InstrSet PHIsInCycle;
if (IsSingleValuePHICycle(MI, SingleValReg, PHIsInCycle) &&
SingleValReg != 0) {
- MRI->replaceRegWith(MI->getOperand(0).getReg(), SingleValReg);
+ unsigned OldReg = MI->getOperand(0).getReg();
+ if (!MRI->constrainRegClass(SingleValReg, MRI->getRegClass(OldReg)))
+ continue;
+
+ MRI->replaceRegWith(OldReg, SingleValReg);
MI->eraseFromParent();
++NumPHICycles;
Changed = true;