change test to check for bcmp

Author: erikdesjardins

src/test/codegen/slice-ref-equality.rs

@@ -0,0 +1,16 @@
+// compile-flags: -C opt-level=3
+
+#![crate_type = "lib"]
+
+// #71602: check that slice equality just generates a single bcmp
+
+// CHECK-LABEL: @is_zero_slice
+#[no_mangle]
+pub fn is_zero_slice(data: &[u8; 4]) -> bool {
+    // CHECK: start:
+    // CHECK-NEXT: %{{.+}} = getelementptr {{.+}}
+    // CHECK-NEXT: %[[BCMP:.+]] = tail call i32 @bcmp({{.+}})
+    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[BCMP]], 0
+    // CHECK-NEXT: ret i1 %[[EQ]]
+    *data == [0; 4]
+}