Don't lower splat vector load to relative to the esp if the
stack may be misaligned.
Update test accordingly.
Patch by Evan Cheng!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94291 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index e3bd694..11e07df 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -3390,17 +3390,10 @@
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
if (DAG.InferPtrAlignment(Ptr) < 16) {
if (MFI->isFixedObjectIndex(FI)) {
- // Can't change the alignment. Reference stack + offset explicitly
- // if stack pointer is at least 16-byte aligned.
- unsigned StackAlign = Subtarget->getStackAlignment();
- if (StackAlign < 16)
- return SDValue();
- Offset = MFI->getObjectOffset(FI) + Offset;
- SDValue StackPtr = DAG.getCopyFromReg(Chain, dl, X86StackPtr,
- getPointerTy());
- Ptr = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr,
- DAG.getConstant(Offset & ~15, getPointerTy()));
- Offset %= 16;
+ // Can't change the alignment. FIXME: It's possible to compute
+ // the exact stack offset and reference FI + adjust offset instead.
+ // If someone *really* cares about this. That's the way to implement it.
+ return SDValue();
} else {
MFI->setObjectAlignment(FI, 16);
}