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-rw-r--r--llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp4
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);
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