fixup: add Windows assertion

MDevereau · Apr 2, 2024 · a991129 · a991129
1 parent 1e8a402
commit a991129
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -2935,6 +2935,12 @@ AArch64TargetLowering::EmitExpandZABuffer(MachineInstr &MI,
   MachineFunction *MF = BB->getParent();
   MachineFrameInfo &MFI = MF->getFrameInfo();
   AArch64FunctionInfo *FuncInfo = MF->getInfo<AArch64FunctionInfo>();
+  // TODO This function grows the stack with a subtraction, which doesn't work
+  // on Windows. Some refactoring to share the functionality in
+  // LowerWindowsDYNAMIC_STACKALLOC will be required once the Windows ABI
+  // supports SME
+  assert(!MF->getSubtarget<AArch64Subtarget>().isTargetWindows() &&
+         "Lazy ZA save is not yet supported on Windows");
 
   std::optional<TPIDR2Object> TPIDR2 = FuncInfo->getTPIDR2Obj();
   if (!TPIDR2)