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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109652 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index c0f5a40..81e9750 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -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;