diff options
| -rw-r--r-- | lib/CodeGen/RegisterScavenging.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp index 5aa2ca3ede..0938e3a04e 100644 --- a/lib/CodeGen/RegisterScavenging.cpp +++ b/lib/CodeGen/RegisterScavenging.cpp @@ -43,6 +43,12 @@ RegScavenger::RegScavenger(MachineBasicBlock *mbb) if (CSRegs != NULL) for (unsigned i = 0; CSRegs[i]; ++i) CalleeSavedRegs.set(CSRegs[i]); + + // Live-in registers are in use. + if (!MBB->livein_empty()) + for (MachineBasicBlock::const_livein_iterator I = MBB->livein_begin(), + E = MBB->livein_end(); I != E; ++I) + setUsed(*I); } void RegScavenger::forward() { |