Merging r181540:

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r181540 | void | 2013-05-09 13:10:38 -0700 (Thu, 09 May 2013) | 11 lines

Generate a compact unwind encoding in the face of a stack alignment push.

We generate a `push' of a random register (%rax) if the stack needs to be
aligned by the size of that register. However, this could mess up compact unwind
generation. In particular, we want to still generate compact unwind in the
presence of this monstrosity.

Check if the push of of the %rax/%eax register. If it is and it's marked with
the `FrameSetup' flag, then we can generate a compact unwind encoding for the
function only if the push is the last FrameSetup instruction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_33@181955 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Target/X86/X86FrameLowering.cpp b/lib/Target/X86/X86FrameLowering.cpp
index 16e1e42c50..42809a06d7 100644
--- a/lib/Target/X86/X86FrameLowering.cpp
+++ b/lib/Target/X86/X86FrameLowering.cpp
@@ -534,6 +534,12 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
       // If there are too many saved registers, we cannot use compact encoding.
       if (SavedRegIdx >= CU_NUM_SAVED_REGS) return CU::UNWIND_MODE_DWARF;
 
+      unsigned Reg = MI.getOperand(0).getReg();
+      if (Reg == (Is64Bit ? X86::RAX : X86::EAX)) {
+        ExpectEnd = true;
+        continue;
+      }
+
       SavedRegs[SavedRegIdx++] = MI.getOperand(0).getReg();
       StackAdjust += OffsetSize;
       InstrOffset += PushInstrSize;