add cmpxchg builtin function

1 files changed, 12 insertions, 0 deletions

diff --git a/test/run_tests.cpp b/test/run_tests.cpp
index 40b0824092..9d5861d9e5 100644
--- a/test/run_tests.cpp
+++ b/test/run_tests.cpp
@@ -1295,8 +1295,20 @@ fn foo() {
 #static_eval_enable(false)
 fn bar() -> i32 { 2 }
     )SOURCE", 1, ".tmp_source.zig:3:15: error: unable to infer expression type");
+
+    add_compile_fail_case("atomic orderings of cmpxchg", R"SOURCE(
+fn f() {
+    var x: i32 = 1234;
+    while (!@cmpxchg(&x, 1234, 5678, AtomicOrder.Monotonic, AtomicOrder.SeqCst)) {}
+    while (!@cmpxchg(&x, 1234, 5678, AtomicOrder.Unordered, AtomicOrder.Unordered)) {}
+}
+    )SOURCE", 2,
+            ".tmp_source.zig:4:72: error: failure atomic ordering must be no stricter than success",
+            ".tmp_source.zig:5:49: error: success atomic ordering must be Monotonic or stricter");
 }
 
+//////////////////////////////////////////////////////////////////////////////
+
 static void add_debug_safety_test_cases(void) {
     add_debug_safety_case("out of bounds slice access", R"SOURCE(
 pub fn main(args: [][]u8) -> %void {