omp_for_collapse_non_rectangular.c

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// RUN: %libomp-compile-and-run
 
// Support for collapse of non-rectangular loop nests was added in GCC 11
// UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8, gcc-9, gcc-10
 
#include <stdio.h>
 
#define N 3
 
int arr[N][N][N];
int main() {
#pragma omp for collapse(3)
  for (unsigned int i = 0; i < N; ++i)
    for (unsigned int j = i; j < N; ++j)
      for (unsigned int k = j; k < N; ++k)
        arr[i][j][k] = 1;
  int num_failed = 0;
  for (unsigned int i = 0; i < N; ++i)
    for (unsigned int j = 0; j < N; ++j)
      for (unsigned int k = 0; k < N; ++k)
        if (arr[i][j][k] == (j >= i && k >= j) ? 0 : 1)
          ++num_failed;
 
  return num_failed;
}