diff options
Diffstat (limited to 'lib/Target/ARM/ARMFrameLowering.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMFrameLowering.cpp | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/lib/Target/ARM/ARMFrameLowering.cpp b/lib/Target/ARM/ARMFrameLowering.cpp index c99259df7a..e2e95d47b3 100644 --- a/lib/Target/ARM/ARMFrameLowering.cpp +++ b/lib/Target/ARM/ARMFrameLowering.cpp @@ -445,8 +445,7 @@ ARMFrameLowering::getFrameIndexReference(const MachineFunction &MF, int FI, int ARMFrameLowering::ResolveFrameIndexReference(const MachineFunction &MF, - int FI, - unsigned &FrameReg, + int FI, unsigned &FrameReg, int SPAdj) const { const MachineFrameInfo *MFI = MF.getFrameInfo(); const ARMBaseRegisterInfo *RegInfo = @@ -490,19 +489,23 @@ ARMFrameLowering::ResolveFrameIndexReference(const MachineFunction &MF, return FPOffset; } else if (MFI->hasVarSizedObjects()) { assert(RegInfo->hasBasePointer(MF) && "missing base pointer!"); - // Try to use the frame pointer if we can, else use the base pointer - // since it's available. This is handy for the emergency spill slot, in - // particular. if (AFI->isThumb2Function()) { + // Try to use the frame pointer if we can, else use the base pointer + // since it's available. This is handy for the emergency spill slot, in + // particular. if (FPOffset >= -255 && FPOffset < 0) { FrameReg = RegInfo->getFrameRegister(MF); return FPOffset; } - } else - FrameReg = RegInfo->getBaseRegister(); + } } else if (AFI->isThumb2Function()) { + // Use add <rd>, sp, #<imm8> + // ldr <rd>, [sp, #<imm8>] + // if at all possible to save space. + if (Offset >= 0 && (Offset & 3) == 0 && Offset <= 1020) + return Offset; // In Thumb2 mode, the negative offset is very limited. Try to avoid - // out of range references. + // out of range references. ldr <rt>,[<rn>, #-<imm8>] if (FPOffset >= -255 && FPOffset < 0) { FrameReg = RegInfo->getFrameRegister(MF); return FPOffset; |