[llvm] r237474 - [X86] Use a better sentinel offset for the FrameAddr index

[David Majnemer]

Author: majnemer
Date: Fri May 15 15:08:27 2015
New Revision: 237474

URL: http://llvm.org/viewvc/llvm-project?rev=237474&view=rev
Log:
[X86] Use a better sentinel offset for the FrameAddr index

Other pieces of CodeGen want to negate frame object offsets to account
for architectures where the stack grows down.  Our object is a pseudo
object so it's offset doesn't matter.  However, we shouldn't choose an
offset which results in undefined behavior if you negate it.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=237474&r1=237473&r2=237474&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Fri May 15 15:08:27 2015
@@ -15637,7 +15637,7 @@ SDValue X86TargetLowering::LowerFRAMEADD
       // Set up a frame object for the return address.
       unsigned SlotSize = RegInfo->getSlotSize();
       FrameAddrIndex = MF.getFrameInfo()->CreateFixedObject(
-          SlotSize, /*Offset=*/INT64_MIN, /*IsImmutable=*/false);
+          SlotSize, /*Offset=*/0, /*IsImmutable=*/false);
       FuncInfo->setFAIndex(FrameAddrIndex);
     }
     return DAG.getFrameIndex(FrameAddrIndex, VT);