clang/test/OpenMP/loop_collapse_1.c

   1 // RUN: %clang_cc1 -fopenmp -fopenmp-version=50 -verify %s
   2
   3 void func( double *A, int N, int M, int NB ) {
   4 #pragma omp parallel
   5   {
   6     int nblks = (N-1)/NB;
   7     int lnb = ((N-1)/NB)*NB;
   8
   9 #pragma omp for collapse(2)
  10     for (int jblk = 0 ; jblk < nblks ; jblk++ ) {
  11       int jb = (jblk == nblks - 1 ? lnb : NB);
  12       for (int jk = 0; jk < N; jk+=jb) {  // expected-error{{cannot use variable 'jb' in collapsed imperfectly-nested loop increment statement}}
  13       }
  14     }
  15
  16 #pragma omp for collapse(2)
  17     for (int a = 0; a < N; a++) {
  18       for (int b = 0; b < M; b++) {
  19         int cx = a+b < NB ? a : b;
  20         for (int c = 0; c < cx; c++) {
  21         }
  22       }
  23     }
  24
  25 #pragma omp for collapse(3)
  26     for (int a = 0; a < N; a++) {
  27       for (int b = 0; b < M; b++) {
  28         int cx = a+b < NB ? a : b;
  29         for (int c = 0; c < cx; c++) {  // expected-error{{cannot use variable 'cx' in collapsed imperfectly-nested loop condition statement}}
  30         }
  31       }
  32     }
  33   }
  34 }
  35
  36 int main(void) {
  37   double arr[256];
  38   func (arr, 16, 16, 16);
  39   return 0;
  40 }