http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51760
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-05
11:48:28 UTC ---
This is because likely_value says VARYING for __builtin___memmove_chk (&a, b_1,
0, D.1724_7) if b_1 is not already CONSTANT. But we evaluate it with
/* These builtins return their first argument, unmodified. */
case BUILT_IN_MEMCPY:
case BUILT_IN_MEMMOVE:
anyway, so likely_value should return CONSTANT if the first arg of these
builtins is constant.
