LoopVectorize: add test for crash in #72969

Author: artagnon

llvm/test/Transforms/LoopVectorize/X86/pr72969.ll

@@ -0,0 +1,25 @@
+; RUN: not --crash opt -mtriple=x86_64 -mattr=-avx,-avx2,-avx512f,+sse,-sse2,-sse3,-sse4.2 -passes=loop-vectorize -S < %s
+; RUN: not --crash opt -mtriple=x86_64 -mattr=-avx,-avx2,-avx512f,+sse,-sse2,-sse3,-sse4.2 -passes=loop-vectorize -force-vector-width=4 -S < %s
+
+@h = global i64 0
+
+define void @test(ptr %p) {
+entry:
+  br label %for.body
+
+for.body:
+  %idx.ext.merge = phi i64 [ 1, %entry ], [ %idx, %for.body ]
+  %inc.merge = phi i16 [ 1, %entry ], [ %inc, %for.body ]
+  %idx.merge = phi i64 [ 0, %entry ], [ %idx.ext.merge, %for.body ]
+  %add = shl i64 %idx.merge, 1
+  %arrayidx = getelementptr i64, ptr %p, i64 %add
+  store i64 0, ptr %arrayidx
+  %inc = add i16 %inc.merge, 1
+  %idx = zext i16 %inc to i64
+  %gep = getelementptr i64, ptr %p, i64 %idx
+  %cmp = icmp ugt ptr %gep, @h
+  br i1 %cmp, label %exit, label %for.body
+
+exit:
+  ret void
+}