[X86][x32] Save callee-save register used as base pointer for x32 ABI
For the x32 ABI, since the base pointer register (EBX) is a callee save register
it should be saved before use.
This fixes https://bugs.llvm.org/show_bug.cgi?id=36011
Differential Revision: https://reviews.llvm.org/D42358
Patch by Pratik Bhatu
llvm-svn: 326593
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index 545248a..34febe6 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -2108,8 +2108,12 @@
TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
// Spill the BasePtr if it's used.
- if (TRI->hasBasePointer(MF))
- SavedRegs.set(TRI->getBaseRegister());
+ if (TRI->hasBasePointer(MF)){
+ unsigned BasePtr = TRI->getBaseRegister();
+ if (STI.isTarget64BitILP32())
+ BasePtr = getX86SubSuperRegister(BasePtr, 64);
+ SavedRegs.set(BasePtr);
+ }
}
static bool