7f7e1749c5
We can use dominance and avoid the special handling of kernels and prevent inserting code before allocas accidentally (as happend in the runtime test).
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
// Check that omp atomic compare handles signedness of integer comparisons
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// correctly.
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//
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// At one time, a bug sometimes reversed the signedness.
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// RUN: %libomptarget-compile-generic -fopenmp-version=51
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// RUN: %libomptarget-run-generic | %fcheck-generic
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// RUN: %libomptarget-compileopt-generic -fopenmp-version=51
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// RUN: %libomptarget-run-generic | %fcheck-generic
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// High parallelism increases our chances of detecting a lack of atomicity.
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#define NUM_THREADS_TRY 256
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#include <limits.h>
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#include <omp.h>
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#include <stdio.h>
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int main() {
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// CHECK: signed: num_threads=[[#NUM_THREADS:]]{{$}}
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// CHECK-NEXT: signed: xs=[[#NUM_THREADS-1]]{{$}}
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int xs = -1;
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int numThreads;
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#pragma omp target parallel for num_threads(NUM_THREADS_TRY) \
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map(tofrom : xs, numThreads)
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for (int i = 0; i < omp_get_num_threads(); ++i) {
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#pragma omp atomic compare
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if (xs < i) {
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xs = i;
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}
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if (i == 0)
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numThreads = omp_get_num_threads();
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}
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printf("signed: num_threads=%d\n", numThreads);
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printf("signed: xs=%d\n", xs);
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// CHECK-NEXT: unsigned: xu=0x0{{$}}
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unsigned xu = UINT_MAX;
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#pragma omp target parallel for num_threads(NUM_THREADS_TRY) map(tofrom : xu)
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for (int i = 0; i < omp_get_num_threads(); ++i) {
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#pragma omp atomic compare
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if (xu > i) {
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xu = i;
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}
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}
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printf("unsigned: xu=0x%x\n", xu);
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return 0;
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}
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