diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86FrameLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86FrameLowering.cpp | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp index 95ed590..cba7843 100644 --- a/llvm/lib/Target/X86/X86FrameLowering.cpp +++ b/llvm/lib/Target/X86/X86FrameLowering.cpp @@ -24,6 +24,7 @@ #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineModuleInfo.h" #include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/CodeGen/RegisterScavenging.h" #include "llvm/CodeGen/WinEHFuncInfo.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/EHPersonalities.h" @@ -2678,7 +2679,7 @@ StackOffset X86FrameLowering::getFrameIndexReference(const MachineFunction &MF, // object. // We need to factor in additional offsets applied during the prologue to the // frame, base, and stack pointer depending on which is used. - int Offset = MFI.getObjectOffset(FI) - getOffsetOfLocalArea(); + int64_t Offset = MFI.getObjectOffset(FI) - getOffsetOfLocalArea(); const X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); unsigned CSSize = X86FI->getCalleeSavedFrameSize(); uint64_t StackSize = MFI.getStackSize(); @@ -4212,6 +4213,14 @@ void X86FrameLowering::processFunctionBeforeFrameFinalized( // emitPrologue if it gets called and emits CFI. MF.setHasWinCFI(false); + MachineFrameInfo &MFI = MF.getFrameInfo(); + // If the frame is big enough that we might need to scavenge a register to + // handle huge offsets, reserve a stack slot for that now. + if (!isInt<32>(MFI.estimateStackSize(MF))) { + int FI = MFI.CreateStackObject(SlotSize, Align(SlotSize), false); + RS->addScavengingFrameIndex(FI); + } + // If we are using Windows x64 CFI, ensure that the stack is always 8 byte // aligned. The format doesn't support misaligned stack adjustments. if (MF.getTarget().getMCAsmInfo()->usesWindowsCFI()) |