| /* { dg-do compile } */ |
| /* { dg-options "-O3 -fdump-tree-local-pure-const1 -fdump-tree-optimized" } */ |
| static __attribute__ ((noinline, noclone)) |
| int i_am_pure(char *c, int n) |
| { |
| char *d=__builtin_alloca (n); |
| int i; |
| int sum = 0; |
| for (i=0;i<n;i++) |
| d[i] = c[i]; |
| for (i=0;i<n;i++) |
| d[i] *= c[n-i]; |
| for (i=0;i<n;i++) |
| sum+=d[i]; |
| if (sum) |
| __builtin_unreachable (); |
| return sum; |
| } |
| char array[11]; |
| int |
| main(void) |
| { |
| i_am_pure (array,5); |
| i_am_pure (array,11); |
| return 0; |
| } |
| /* { dg-final { scan-tree-dump "found to be pure: i_am_pure" "local-pure-const1"} } */ |
| /* { dg-final { scan-tree-dump-not "i_am_pure" "optimized"} } */ |
