diff options
| -rw-r--r-- | lib/Target/ARM/ARMBaseRegisterInfo.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp index d9b8323f4a..11e1c4862b 100644 --- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp +++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp @@ -590,6 +590,10 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, AFI->isThumb2Function()) MF.getRegInfo().setPhysRegUsed(ARM::R4); + // Spill LR if Thumb1 function uses variable length argument lists. + if (AFI->isThumb1OnlyFunction() && AFI->getVarArgsRegSaveSize() > 0) + MF.getRegInfo().setPhysRegUsed(ARM::LR); + // Don't spill FP if the frame can be eliminated. This is determined // by scanning the callee-save registers to see if any is used. const unsigned *CSRegs = getCalleeSavedRegs(); |