diff options
| -rw-r--r-- | lib/CodeGen/PrologEpilogInserter.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp index 5c4dcdd061..6d6706d9e8 100644 --- a/lib/CodeGen/PrologEpilogInserter.cpp +++ b/lib/CodeGen/PrologEpilogInserter.cpp @@ -96,6 +96,7 @@ FunctionPass *llvm::createPrologEpilogCodeInserter() { return new PEI(); } void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) { const MRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo(); const TargetFrameInfo *TFI = Fn.getTarget().getFrameInfo(); + const TargetInstrInfo &TII = *Fn.getTarget().getInstrInfo(); // Get the callee saved register list... const unsigned *CSRegs = RegInfo->getCalleeSaveRegs(); @@ -133,6 +134,11 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) { "Register allocation must be performed!"); ModifiedRegs[MO.getReg()] = true; // Register is modified } + + // Mark any implicitly defined registers as being modified. + for (const unsigned *ImpDefs = TII.getImplicitDefs(I->getOpcode()); + *ImpDefs; ++ImpDefs) + ModifiedRegs[*ImpDefs] = true; } ++I; } |