diff options
| author | Cameron Zwarich <zwarich@apple.com> | 2011-10-17 21:54:46 +0000 |
|---|---|---|
| committer | Cameron Zwarich <zwarich@apple.com> | 2011-10-17 21:54:46 +0000 |
| commit | d85bc104efe71bce234910a9e15039325e1cd2c8 (patch) | |
| tree | 870b99db6f34bee2e2d65bc46c57612298fb5fd0 /llvm/lib/CodeGen/OptimizePHIs.cpp | |
| parent | e7594abd8762ad83148739372d7b1fc1e1541540 (diff) | |
| download | bcm5719-llvm-d85bc104efe71bce234910a9e15039325e1cd2c8.tar.gz bcm5719-llvm-d85bc104efe71bce234910a9e15039325e1cd2c8.zip | |
When deleting a phi cycle after looking through copies, constrain the register
to match its final use.
With this change, all of test-suite compiles for Thumb2 with -verify-coalescing
enabled.
llvm-svn: 142287
Diffstat (limited to 'llvm/lib/CodeGen/OptimizePHIs.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/OptimizePHIs.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/OptimizePHIs.cpp b/llvm/lib/CodeGen/OptimizePHIs.cpp index c05be130ec6..85fa0418008 100644 --- a/llvm/lib/CodeGen/OptimizePHIs.cpp +++ b/llvm/lib/CodeGen/OptimizePHIs.cpp @@ -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; |
