diff options
Diffstat (limited to 'llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp')
-rw-r--r-- | llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp index 615d7eb7b4d..e1eeddf0816 100644 --- a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp +++ b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp @@ -73,7 +73,9 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) { BitVector Pristine = MFI.getPristineRegs(MF); for (const MCPhysReg *I = MF.getRegInfo().getCalleeSavedRegs(); *I; ++I) { - if (!IsReturnBlock && !Pristine.test(*I)) continue; + unsigned Reg = *I; + if (!IsReturnBlock && !(Pristine.test(Reg) || BB->isLiveIn(Reg))) + continue; for (MCRegAliasIterator AI(*I, TRI, true); AI.isValid(); ++AI) { unsigned Reg = *AI; Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1); |