gcc/testsuite/gcc.dg/pr80131-1.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target int32plus } */
   3 /* { dg-options "-fdump-tree-gimple" } */
   4
   5 /* Checks the simplification of:
   6    1 << (C - x) to (1 << C) >> x, where C = precision (type) - 1
   7    f1 is not simplified but f2, f3 and f4 are. */
   8
   9 __INT64_TYPE__ f1 (__INT64_TYPE__ i)
  10 {
  11   return (__INT64_TYPE__)1 << (31 - i);
  12 }
  13
  14 __INT64_TYPE__ f2 (__INT64_TYPE__ i)
  15 {
  16   return (__INT64_TYPE__)1 << (63 - i);
  17 }
  18
  19 __UINT64_TYPE__ f3 (__INT64_TYPE__ i)
  20 {
  21   return (__UINT64_TYPE__)1 << (63 - i);
  22 }
  23
  24 __INT32_TYPE__ f4 (__INT32_TYPE__ i)
  25 {
  26   return (__INT32_TYPE__)1 << (31 - i);
  27 }
  28
  29 /* { dg-final { scan-tree-dump-times "= 31 -"  1 "gimple" } } */
  30 /* { dg-final { scan-tree-dump-times "9223372036854775808 >>" 2 "gimple" } } */
  31 /* { dg-final { scan-tree-dump "2147483648 >>" "gimple" } } */