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fix cmpxchg with discarded result

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This commit is contained in:
Andrew Kelley
2019-08-02 14:47:26 -04:00
parent a5cb0f77d1
commit 90e64bc620
2 changed files with 17 additions and 1 deletions
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10
test/stage1/behavior/atomics.zig
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@@ -1,5 +1,6 @@
const std = @import("std");
const expect = std.testing.expect;
const expectEqual = std.testing.expectEqual;
const builtin = @import("builtin");
const AtomicRmwOp = builtin.AtomicRmwOp;
const AtomicOrder = builtin.AtomicOrder;
@@ -90,3 +91,12 @@ test "cmpxchg with ptr" {
// expect(@cmpxchgStrong(u128, &x, 5678, 42, .SeqCst, .SeqCst) == null);
// expect(x == 42);
//}
test "cmpxchg with ignored result" {
var x: i32 = 1234;
var ptr = &x;
_ = @cmpxchgStrong(i32, &x, 1234, 5678, .Monotonic, .Monotonic);
expectEqual(i32(5678), x);
}