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// Check that omp atomic compare handles signedness of integer comparisons
// correctly.
//
// At one time, a bug sometimes reversed the signedness.
// RUN: %libomp-compile
// RUN: %libomp-run | FileCheck %s
// This test uses -fopenmp-version, which is not a compiler flag that GCC
// supports.
// UNSUPPORTED: gcc
// High parallelism increases our chances of detecting a lack of atomicity.
#define NUM_THREADS_TRY 256
#include <limits.h>
#include <omp.h>
#include <stdio.h>
int main() {
// CHECK: signed: num_threads=[[#NUM_THREADS:]]{{$}}
// CHECK-NEXT: signed: xs=[[#NUM_THREADS-1]]{{$}}
int xs = -1;
int numThreads;
#pragma omp parallel for num_threads(NUM_THREADS_TRY)
for (int i = 0; i < omp_get_num_threads(); ++i) {
#pragma omp atomic compare
if (xs < i) { xs = i; }
if (i == 0)
numThreads = omp_get_num_threads();
}
printf("signed: num_threads=%d\n", numThreads);
printf("signed: xs=%d\n", xs);
// CHECK-NEXT: unsigned: xu=0x0{{$}}
unsigned xu = UINT_MAX;
#pragma omp parallel for num_threads(NUM_THREADS_TRY)
for (int i = 0; i < omp_get_num_threads(); ++i) {
#pragma omp atomic compare
if (xu > i) { xu = i; }
}
printf("unsigned: xu=0x%x\n", xu);
return 0;
}
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