gcc/testsuite/gcc.dg/tree-ssa/pr15826.c

   1 /* PR tree-optimization/15826 - don't use "if" to extract a single bit
   2    bit-field */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O2 -fdump-tree-optimized" } */
   5
   6 struct s {
   7   unsigned int bit : 1;
   8 };
   9
  10 unsigned int
  11 foo (struct s *p)
  12 {
  13   if (p->bit)
  14     return 1;
  15   else
  16     return 0;
  17 }
  18
  19 unsigned int
  20 bar (struct s *p)
  21 {
  22   return (unsigned int) (p->bit);
  23 }
  24
  25 unsigned int
  26 andrew (struct s *p)
  27 {
  28   int i;
  29   if (p->bit)
  30     i = 1;
  31   else
  32     i = 0;
  33   return i;
  34 }
  35
  36 /* { dg-final { scan-tree-dump-times " & | goto " 0 "optimized" } } */