Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/CodeGen/AArch64/arm64-2012-01-11-ComparisonDAGCrash.ll

@@ -0,0 +1,40 @@
+; RUN: llc < %s -mtriple=arm64-eabi
+
+; The target lowering for integer comparisons was replacing some DAG nodes
+; during operation legalization, which resulted in dangling pointers,
+; cycles in DAGs, and eventually crashes.  This is the testcase for
+; one of those crashes. (rdar://10653656)
+
+define void @test(i1 zeroext %IsArrow) nounwind ssp align 2 {
+entry:
+  br i1 undef, label %return, label %lor.lhs.false
+
+lor.lhs.false:
+  br i1 undef, label %return, label %if.end
+
+if.end:
+  %tmp.i = load i64, i64* undef, align 8
+  %and.i.i.i = and i64 %tmp.i, -16
+  br i1 %IsArrow, label %if.else_crit_edge, label %if.end32
+
+if.else_crit_edge:
+  br i1 undef, label %if.end32, label %return
+
+if.end32:
+  %0 = icmp ult i32 undef, 3
+  %1 = zext i64 %tmp.i to i320
+  %.pn.v = select i1 %0, i320 128, i320 64
+  %.pn = shl i320 %1, %.pn.v
+  %ins346392 = or i320 %.pn, 0
+  store i320 %ins346392, i320* undef, align 8
+  br i1 undef, label %sw.bb.i.i, label %exit
+
+sw.bb.i.i:
+  unreachable
+
+exit:
+  unreachable
+
+return:
+  ret void
+}