| 1 | /* |
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| 2 | * parallel-reduction.c -- Archer testcase |
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| 3 | */ |
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| 4 | |
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| 5 | //===----------------------------------------------------------------------===// |
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| 6 | // |
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| 7 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 8 | // |
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| 9 | // See tools/archer/LICENSE.txt for details. |
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| 10 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | |
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| 15 | // RUN: %libarcher-compile-and-run| FileCheck %s |
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| 16 | // REQUIRES: tsan |
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| 17 | #include <omp.h> |
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| 18 | #include <stdio.h> |
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| 19 | |
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| 20 | int main(int argc, char *argv[]) { |
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| 21 | int var = 0; |
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| 22 | |
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| 23 | // Number of threads is empirical: We need enough threads so that |
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| 24 | // the reduction is really performed hierarchically in the barrier! |
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| 25 | #pragma omp parallel num_threads(5) reduction(+ : var) |
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| 26 | { var = 1; } |
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| 27 | |
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| 28 | fprintf(stderr, format: "DONE\n" ); |
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| 29 | int error = (var != 5); |
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| 30 | return error; |
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| 31 | } |
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| 32 | |
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| 33 | // CHECK-NOT: ThreadSanitizer: data race |
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| 34 | // CHECK-NOT: ThreadSanitizer: reported |
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| 35 | // CHECK: DONE |
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| 36 | |
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