diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 9f2c250..9abc94e 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -3463,11 +3463,16 @@ optimize_bit_field_compare (location_t loc, enum tree_code code, /* See if we can find a mode to refer to this field. We should be able to, but fail if we can't. */ - nmode = get_best_mode (lbitsize, lbitpos, - const_p ? TYPE_ALIGN (TREE_TYPE (linner)) - : MIN (TYPE_ALIGN (TREE_TYPE (linner)), - TYPE_ALIGN (TREE_TYPE (rinner))), - word_mode, lvolatilep || rvolatilep); + if (lvolatilep + && GET_MODE_BITSIZE (lmode) > 0 + && flag_strict_volatile_bitfields > 0) + nmode = lmode; + else + nmode = get_best_mode (lbitsize, lbitpos, + const_p ? TYPE_ALIGN (TREE_TYPE (linner)) + : MIN (TYPE_ALIGN (TREE_TYPE (linner)), + TYPE_ALIGN (TREE_TYPE (rinner))), + word_mode, lvolatilep || rvolatilep); if (nmode == VOIDmode) return 0; |