[llvm-commits] [llvm] r109652 - /llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Wed Jul 28 15:55:38 2010
New Revision: 109652

URL: http://llvm.org/viewvc/llvm-project?rev=109652&view=rev
Log:
Create a fixed stack object for varargs that is as large as any register.

The size of this object isn't used for anything - technically it is of variable
size.

This avoids a false positive from the assert in
X86InstrInfo::loadRegFromStackSlot, and fixes PR7735.

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=109652&r1=109651&r2=109652&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Wed Jul 28 15:55:38 2010
@@ -1701,7 +1701,10 @@
   if (isVarArg) {
     if (Is64Bit || (CallConv != CallingConv::X86_FastCall &&
                     CallConv != CallingConv::X86_ThisCall)) {
-      FuncInfo->setVarArgsFrameIndex(MFI->CreateFixedObject(1, StackSize,true));
+      // The fixed varargs object is created large enough that we can load and
+      // store any register in it.
+      FuncInfo->setVarArgsFrameIndex(MFI->CreateFixedObject(32, StackSize,
+                                                            true));
     }
     if (Is64Bit) {
       unsigned TotalNumIntRegs = 0, TotalNumXMMRegs = 0;