diff options
Diffstat (limited to 'contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp b/contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp index a28a91e..0cb2b5a 100644 --- a/contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp +++ b/contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp @@ -277,8 +277,21 @@ void SystemZFrameLowering:: processFunctionBeforeFrameFinalized(MachineFunction &MF, RegScavenger *RS) const { MachineFrameInfo &MFFrame = MF.getFrameInfo(); - uint64_t MaxReach = (MFFrame.estimateStackSize(MF) + - SystemZMC::CallFrameSize * 2); + // Get the size of our stack frame to be allocated ... + uint64_t StackSize = (MFFrame.estimateStackSize(MF) + + SystemZMC::CallFrameSize); + // ... and the maximum offset we may need to reach into the + // caller's frame to access the save area or stack arguments. + int64_t MaxArgOffset = SystemZMC::CallFrameSize; + for (int I = MFFrame.getObjectIndexBegin(); I != 0; ++I) + if (MFFrame.getObjectOffset(I) >= 0) { + int64_t ArgOffset = SystemZMC::CallFrameSize + + MFFrame.getObjectOffset(I) + + MFFrame.getObjectSize(I); + MaxArgOffset = std::max(MaxArgOffset, ArgOffset); + } + + uint64_t MaxReach = StackSize + MaxArgOffset; if (!isUInt<12>(MaxReach)) { // We may need register scavenging slots if some parts of the frame // are outside the reach of an unsigned 12-bit displacement. |
