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| author | dim <dim@FreeBSD.org> | 2012-04-14 13:54:10 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2012-04-14 13:54:10 +0000 |
| commit | 1fc08f5e9ef733ef1ce6f363fecedc2260e78974 (patch) | |
| tree | 19c69a04768629f2d440944b71cbe90adae0b615 /lib/CodeGen/OptimizePHIs.cpp | |
| parent | 07637c87f826cdf411f0673595e9bc92ebd793f2 (diff) | |
| download | FreeBSD-src-1fc08f5e9ef733ef1ce6f363fecedc2260e78974.zip FreeBSD-src-1fc08f5e9ef733ef1ce6f363fecedc2260e78974.tar.gz | |
Vendor import of llvm trunk r154661:
http://llvm.org/svn/llvm-project/llvm/trunk@r154661
Diffstat (limited to 'lib/CodeGen/OptimizePHIs.cpp')
| -rw-r--r-- | lib/CodeGen/OptimizePHIs.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/CodeGen/OptimizePHIs.cpp b/lib/CodeGen/OptimizePHIs.cpp index c05be13..6da313e 100644 --- a/lib/CodeGen/OptimizePHIs.cpp +++ b/lib/CodeGen/OptimizePHIs.cpp @@ -56,11 +56,10 @@ namespace { } 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(); } - bool OptimizePHIs::runOnMachineFunction(MachineFunction &Fn) { MRI = &Fn.getRegInfo(); TII = Fn.getTarget().getInstrInfo(); @@ -165,7 +164,11 @@ 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; |
