1 | // Check that omp atomic compare handles signedness of integer comparisons |
2 | // correctly. |
3 | // |
4 | // At one time, a bug sometimes reversed the signedness. |
5 | |
6 | // RUN: %libomptarget-compile-generic |
7 | // RUN: %libomptarget-run-generic | %fcheck-generic |
8 | // RUN: %libomptarget-compileopt-generic -fopenmp-version=51 |
9 | // RUN: %libomptarget-run-generic | %fcheck-generic |
10 | |
11 | // High parallelism increases our chances of detecting a lack of atomicity. |
12 | #define NUM_THREADS_TRY 256 |
13 | |
14 | #include <limits.h> |
15 | #include <omp.h> |
16 | #include <stdio.h> |
17 | |
18 | int main() { |
19 | // CHECK: signed: num_threads=[[#NUM_THREADS:]]{{$}} |
20 | // CHECK-NEXT: signed: xs=[[#NUM_THREADS-1]]{{$}} |
21 | int xs = -1; |
22 | int numThreads; |
23 | #pragma omp target parallel for num_threads(NUM_THREADS_TRY) \ |
24 | map(tofrom : xs, numThreads) |
25 | for (int i = 0; i < omp_get_num_threads(); ++i) { |
26 | #pragma omp atomic compare |
27 | if (xs < i) { |
28 | xs = i; |
29 | } |
30 | if (i == 0) |
31 | numThreads = omp_get_num_threads(); |
32 | } |
33 | printf(format: "signed: num_threads=%d\n" , numThreads); |
34 | printf(format: "signed: xs=%d\n" , xs); |
35 | |
36 | // CHECK-NEXT: unsigned: xu=0x0{{$}} |
37 | unsigned xu = UINT_MAX; |
38 | #pragma omp target parallel for num_threads(NUM_THREADS_TRY) map(tofrom : xu) |
39 | for (int i = 0; i < omp_get_num_threads(); ++i) { |
40 | #pragma omp atomic compare |
41 | if (xu > i) { |
42 | xu = i; |
43 | } |
44 | } |
45 | printf(format: "unsigned: xu=0x%x\n" , xu); |
46 | return 0; |
47 | } |
48 | |