[LV] Pre-commit test for #125278

Author: artagnon

llvm/test/Transforms/LoopVectorize/pr125278.ll

@@ -0,0 +1,21 @@
+; REQUIRES: asserts
+; RUN: not --crash opt -passes=loop-vectorize -disable-output %s
+
+define void @pr125278(ptr %dst, i64 %n) {
+entry:
+  %true.ext = zext i1 true to i32
+  br label %cond
+
+cond:
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %cond ], [ %iv.next, %loop ]
+  %false.ext = zext i1 false to i32
+  %xor = xor i32 %false.ext, %true.ext
+  %xor.trunc = trunc i32 %xor to i8
+  store i8 %xor.trunc, ptr %dst, align 1
+  %iv.next = add i64 %iv, 1
+  %cmp = icmp ult i64 %iv.next, %n
+  br i1 %cmp, label %loop, label %cond
+}