48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
|
// Check that omp atomic compare handles signedness of integer comparisons
|
||
|
|
// correctly.
|
||
|
|
//
|
||
|
|
// At one time, a bug sometimes reversed the signedness.
|
||
|
|
|
||
|
|
// RUN: %libomptarget-compile-generic
|
||
|
|
// RUN: %libomptarget-run-generic | %fcheck-generic
|
||
|
|
// RUN: %libomptarget-compileopt-generic -fopenmp-version=51
|
||
|
|
// RUN: %libomptarget-run-generic | %fcheck-generic
|
||
|
|
|
||
|
|
// 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 target parallel for num_threads(NUM_THREADS_TRY) \
|
||
|
|
map(tofrom : xs, numThreads)
|
||
|
|
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 target parallel for num_threads(NUM_THREADS_TRY) map(tofrom : xu)
|
||
|
|
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;
|
||
|
|
}
|