X86: correct tail return address calculation
Due to the weird and wondeful usual arithmetic conversions, some
calculations involving negative values were getting performed in
uint32_t and then promoted to int64_t, which is really not a good
idea.
Patch by Katsuhiro Ueno.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187703 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1f6c330..dc56547 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2456,7 +2456,8 @@
if (!FPDiff) return Chain;
// Calculate the new stack slot for the return address.
int NewReturnAddrFI =
- MF.getFrameInfo()->CreateFixedObject(SlotSize, FPDiff-SlotSize, false);
+ MF.getFrameInfo()->CreateFixedObject(SlotSize, (int64_t)FPDiff - SlotSize,
+ false);
SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewReturnAddrFI, PtrVT);
Chain = DAG.getStore(Chain, dl, RetAddrFrIdx, NewRetAddrFrIdx,
MachinePointerInfo::getFixedStack(NewReturnAddrFI),
@@ -3323,7 +3324,8 @@
if (ReturnAddrIndex == 0) {
// Set up a frame object for the return address.
unsigned SlotSize = RegInfo->getSlotSize();
- ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize, -SlotSize,
+ ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize,
+ -(int64_t)SlotSize,
false);
FuncInfo->setRAIndex(ReturnAddrIndex);
}