thread_limit.c
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// RUN: %compile-run-and-check
#include <omp.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
int ThreadLimitL0 = -1, ThreadLimitL1 = -1, ThreadLimitL2 = -1;
#pragma omp declare reduction(unique64:int \
: omp_out = (omp_in == 64 ? omp_in : omp_out)) \
initializer(omp_priv = -1)
#pragma omp declare reduction(unique32:int \
: omp_out = (omp_in == 32 ? omp_in : omp_out)) \
initializer(omp_priv = -1)
// Non-SPMD mode.
#pragma omp target teams map(ThreadLimitL0, ThreadLimitL1, ThreadLimitL2) \
thread_limit(64) num_teams(1)
{
ThreadLimitL0 = omp_get_thread_limit();
#pragma omp parallel reduction(unique64 \
: ThreadLimitL1, ThreadLimitL2) num_threads(32)
{
ThreadLimitL1 = omp_get_thread_limit();
#pragma omp parallel reduction(unique64 : ThreadLimitL2)
{ ThreadLimitL2 = omp_get_thread_limit(); }
}
}
// CHECK: Non-SPMD ThreadLimitL0 = 64
printf("Non-SPMD ThreadLimitL0 = %d\n", ThreadLimitL0);
// CHECK: Non-SPMD ThreadLimitL1 = 64
printf("Non-SPMD ThreadLimitL1 = %d\n", ThreadLimitL1);
// CHECK: Non-SPMD ThreadLimitL2 = 64
printf("Non-SPMD ThreadLimitL2 = %d\n", ThreadLimitL2);
// SPMD mode with full runtime
ThreadLimitL1 = -1;
ThreadLimitL2 = -1;
#pragma omp target parallel reduction(unique32 \
: ThreadLimitL1, ThreadLimitL2) \
num_threads(32)
{
ThreadLimitL1 = omp_get_thread_limit();
#pragma omp parallel reduction(unique32 : ThreadLimitL2)
{ ThreadLimitL2 = omp_get_thread_limit(); }
}
// CHECK: SPMD with full runtime ThreadLimitL1 = 32
printf("SPMD with full runtime ThreadLimitL1 = %d\n", ThreadLimitL1);
// CHECK: SPMD with full runtime ThreadLimitL2 = 32
printf("SPMD with full runtime ThreadLimitL2 = %d\n", ThreadLimitL2);
// SPMD mode without runtime
ThreadLimitL1 = -1;
ThreadLimitL2 = -1;
#pragma omp target parallel for reduction(unique32 \
: ThreadLimitL1, ThreadLimitL2) \
num_threads(32)
for (int I = 0; I < 2; ++I) {
ThreadLimitL1 = omp_get_thread_limit();
#pragma omp parallel reduction(unique32 : ThreadLimitL2)
{ ThreadLimitL2 = omp_get_thread_limit(); }
}
// CHECK: SPMD without runtime ThreadLimitL1 = 32
printf("SPMD without runtime ThreadLimitL1 = %d\n", ThreadLimitL1);
// CHECK: SPMD without runtime ThreadLimitL2 = 32
printf("SPMD without runtime ThreadLimitL2 = %d\n", ThreadLimitL2);
return 0;
}