gcc/testsuite/c-c++-common/unroll-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-cunroll-details -fdump-rtl-loop2_unroll-details" } */
   3
   4 extern void bar (int);
   5
   6 int j;
   7
   8 void test (void)
   9 {
  10   #pragma GCC unroll 8
  11   for (unsigned long i = 1; i <= 8; ++i)
  12     bar(i);
  13   /* { dg-final { scan-tree-dump "11:.*: note: loop with 7 iterations completely unrolled" "cunroll" } } */
  14
  15   #pragma GCC unroll 8
  16   for (unsigned long i = 1; i <= 7; ++i)
  17     bar(i);
  18   /* { dg-final { scan-tree-dump "16:.*: note: loop with 6 iterations completely unrolled" "cunroll" } } */
  19
  20   #pragma GCC unroll 8
  21   for (unsigned long i = 1; i <= 15; ++i)
  22     bar(i);
  23   /* { dg-final { scan-rtl-dump "21:.*: note: loop unrolled 7 times" "loop2_unroll" } } */
  24
  25   #pragma GCC unroll 8
  26   for (unsigned long i = 1; i <= j; ++i)
  27     bar(i);
  28   /* { dg-final { scan-rtl-dump "26:.*: note: loop unrolled 7 times" "loop2_unroll" } } */
  29
  30   #pragma GCC unroll 7
  31   for (unsigned long i = 1; i <= j; ++i)
  32     bar(i);
  33   /* { dg-final { scan-rtl-dump "31:.*: note: loop unrolled 3 times" "loop2_unroll" } } */
  34
  35   unsigned long i = 0;
  36   #pragma GCC unroll 3
  37   do {
  38     bar(i);
  39   } while (++i < 9);
  40   /* { dg-final { scan-rtl-dump "3\[79\]:.*: note: loop unrolled 2 times" "loop2_unroll" } } */
  41 }