unsigned short a[256]; __attribute__((noinline, noclone)) void bar (void *x, unsigned short z) { unsigned short *y = (unsigned short *) x; if (y < &a[5] || y > &a[222] || y == &a[124]) __builtin_abort (); *y += z; } __attribute__((noinline, noclone)) void foo (void *qx, void *rx, void *sx, int n) { unsigned short (*q)[n], (*r)[n], (*s)[n], (*p)[n]; q = (typeof (q)) qx; r = (typeof (r)) rx; s = (typeof (s)) sx; #pragma omp for for (p = q; p != r; p++) bar (p, 1); #pragma omp for for (p = s; p != r; p--) bar (p, 2); #pragma omp for for (p = q; p != r; p = p + 1) bar (p, 4); #pragma omp for for (p = s; p != r; p = p - 1) bar (p, 8); #pragma omp for for (p = q; p != r; p = 1 + p) bar (p, 16); #pragma omp for for (p = s; p != r; p = -1 + p) bar (p, 32); #pragma omp for for (p = q; p != r; p += 1) bar (p, 64); #pragma omp for for (p = s; p != r; p -= 1) bar (p, 128); } __attribute__((noinline, noclone)) void baz (void *qx, void *rx, void *sx, int n) { unsigned short (*q)[n], (*r)[n], (*s)[n], (*p)[n]; q = (typeof (q)) qx; r = (typeof (r)) rx; s = (typeof (s)) sx; #pragma omp for for (p = q; p < r; p++) bar (p, 256); #pragma omp for for (p = s; p > r; p--) bar (p, 512); #pragma omp for for (p = q; p < r; p = p + 1) bar (p, 1024); #pragma omp for for (p = s; p > r; p = p - 1) bar (p, 2048); #pragma omp for for (p = q; p < r; p = 1 + p) bar (p, 4096); #pragma omp for for (p = s; p > r; p = -1 + p) bar (p, 8192); #pragma omp for for (p = q; p < r; p += 1) bar (p, 16384); #pragma omp for for (p = s; p > r; p -= 1) bar (p, 32768U); } int main () { int i; volatile int j = 7; #pragma omp parallel { foo (&a[5 + (j - 7)], &a[124 + (j - 7)], &a[222 + (j - 7)], j); baz (&a[5 + (j - 7)], &a[124 + (j - 7)], &a[222 + (j - 7)], j); } for (i = 0; i < 256; i++) if (i < 5 || i > 222 || i == 124 || ((i - 5) % 7) != 0) { if (a[i]) __builtin_abort (); } else if (i < 124 && a[i] != 1 + 4 + 16 + 64 + 256 + 1024 + 4096 + 16384) __builtin_abort (); else if (i > 124 && a[i] != 2 + 8 + 32 + 128 + 512 + 2048 + 8192 + 32768U) __builtin_abort (); return 0; }