| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // REQUIRES: clang |
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| 10 | |
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| 11 | // Adding "-fsanitize=thread" directly causes many platforms to fail (because |
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| 12 | // they don't support tsan), and causes other sanitizer builds to fail (e.g. |
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| 13 | // asan and tsan don't mix). Instead, require the tsan feature. |
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| 14 | // REQUIRES: tsan |
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| 15 | |
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| 16 | // This test verifies behavior specified by [atomics.types.operations.req]/21: |
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| 17 | // |
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| 18 | // When only one memory_order argument is supplied, the value of success is |
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| 19 | // order, and the value of failure is order except that a value of |
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| 20 | // memory_order_acq_rel shall be replaced by the value memory_order_acquire |
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| 21 | // and a value of memory_order_release shall be replaced by the value |
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| 22 | // memory_order_relaxed. |
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| 23 | // |
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| 24 | // This test mirrors replace_failure_order.pass.cpp. However, we also want to |
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| 25 | // verify the codegen is correct. This verifies a bug where memory_order_acq_rel |
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| 26 | // was not being replaced with memory_order_acquire in external |
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| 27 | // TSAN-instrumented tests. |
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| 28 | |
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| 29 | // RUN: %{cxx} -c %s %{flags} %{compile_flags} -O2 -stdlib=libc++ -S -emit-llvm -o %t.ll |
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| 30 | |
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| 31 | #include <atomic> |
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| 32 | |
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| 33 | // Note: libc++ tests do not use on FileCheck. |
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| 34 | // RUN: grep -E "call i32 @__tsan_atomic32_compare_exchange_val\(.*, i32 1, i32 4, i32 2\)" %t.ll |
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| 35 | bool strong_memory_order_acq_rel(std::atomic<int>* a, int cmp) { |
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| 36 | return a->compare_exchange_strong(i1&: cmp, i2: 1, m: std::memory_order_acq_rel); |
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| 37 | } |
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| 38 | |
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