[llvm] [X86][APX] Fix segfault in foldMemoryOperandImpl for two-address NDD fold (PR #190562)

[Phoebe Wang via llvm-commits]

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@@ -0,0 +1,71 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+ndd -verify-machineinstrs | FileCheck %s
+;
+; Verify that folding NDD instructions to non-NDD with memory operands does not
+; crash when the fold goes through the two-address path (IsTwoAddr=true).
+; This is a regression test for a segfault in foldMemoryOperandImpl where
+; NewMI->getOperand(1).setReg() was called on a memory operand instead of a
+; register operand after fuseTwoAddrInst.
+
+define void @ndd_fold_twoaddr(ptr %0, i64 %1, ptr %2, i64 %3, i1 %4) {
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phoebewang wrote:

Add `nounwind` to suppress CFI directives.

https://github.com/llvm/llvm-project/pull/190562