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When deleting a phi cycle after looking through copies, constrain the register

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to match its final use.

With this change, all of test-suite compiles for Thumb2 with -verify-coalescing
enabled.

llvm-svn: 142287
This commit is contained in:
Cameron Zwarich 2011-10-17 21:54:46 +00:00
parent 5ef0a146b9
commit 89bd8788a1
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/OptimizePHIs.cpp
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@ -165,7 +165,11 @@ bool OptimizePHIs::OptimizeBB(MachineBasicBlock &MBB) {
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;