diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86FrameLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86FrameLowering.cpp | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp index 136a7e1d19b..f180cc0ad98 100644 --- a/llvm/lib/Target/X86/X86FrameLowering.cpp +++ b/llvm/lib/Target/X86/X86FrameLowering.cpp @@ -1059,13 +1059,21 @@ getCompactUnwindEncoding(ArrayRef<MCCFIInstruction> Instrs, const bool IsRelative = (Operation == MCCFIInstruction::RelMove); if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { - if (Src.getReg() == MachineLocation::VirtualFP) { - // DW_CFA_def_cfa_offset - if (IsRelative) - CFAOffset += Src.getOffset(); - else - CFAOffset -= Src.getOffset(); - } // else DW_CFA_def_cfa + if (Src.getReg() != MachineLocation::VirtualFP) { + // DW_CFA_def_cfa + assert(FramePointerReg == -1 &&"Defining more than one frame pointer?"); + FramePointerReg = Src.getReg(); + if (TRI->getLLVMRegNum(FramePointerReg, IsEH) != X86::EBP && + TRI->getLLVMRegNum(FramePointerReg, IsEH) != X86::RBP) + // The frame pointer isn't EBP/RBP. Cannot make unwind information + // compact. + return 0; + } // else DW_CFA_def_cfa_offset + + if (IsRelative) + CFAOffset += Src.getOffset(); + else + CFAOffset -= Src.getOffset(); continue; } |
