| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // REQUIRES: clang |
| // UNSUPPORTED: libcpp-has-no-threads |
| |
| // Adding "-fsanitize=thread" directly causes many platforms to fail (because |
| // they don't support tsan), and causes other sanitizer builds to fail (e.g. |
| // asan and tsan don't mix). Instead, require the tsan feature. |
| // REQUIRES: tsan |
| |
| // This test verifies behavior specified by [atomics.types.operations.req]/21: |
| // |
| // When only one memory_order argument is supplied, the value of success is |
| // order, and the value of failure is order except that a value of |
| // memory_order_acq_rel shall be replaced by the value memory_order_acquire |
| // and a value of memory_order_release shall be replaced by the value |
| // memory_order_relaxed. |
| // |
| // This test mirrors replace_failure_order.pass.cpp. However, we also want to |
| // verify the codegen is correct. This verifies a bug where memory_order_acq_rel |
| // was not being replaced with memory_order_acquire in external |
| // TSAN-instrumented tests. |
| |
| // RUN: %{cxx} -c %s %{flags} %{compile_flags} -O2 -stdlib=libc++ -S -emit-llvm -o %t.ll |
| |
| #include <atomic> |
| |
| // Note: libc++ tests do not use on FileCheck. |
| // RUN: grep -E "call i32 @__tsan_atomic32_compare_exchange_val\(.*, i32 1, i32 4, i32 2\)" %t.ll |
| bool strong_memory_order_acq_rel(std::atomic<int>* a, int cmp) { |
| return a->compare_exchange_strong(cmp, 1, std::memory_order_acq_rel); |
| } |
