diff options
Diffstat (limited to 'gcc/targhooks.c')
| -rw-r--r-- | gcc/targhooks.c | 49 |
1 files changed, 32 insertions, 17 deletions
diff --git a/gcc/targhooks.c b/gcc/targhooks.c index 6b4601b..95980f5 100644 --- a/gcc/targhooks.c +++ b/gcc/targhooks.c @@ -1482,25 +1482,40 @@ default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size, switch (op) { - case CLEAR_BY_PIECES: - max_size = STORE_MAX_PIECES; - ratio = CLEAR_RATIO (speed_p); - break; - case MOVE_BY_PIECES: - max_size = MOVE_MAX_PIECES; - ratio = get_move_ratio (speed_p); - break; - case SET_BY_PIECES: - max_size = STORE_MAX_PIECES; - ratio = SET_RATIO (speed_p); - break; - case STORE_BY_PIECES: - max_size = STORE_MAX_PIECES; - ratio = get_move_ratio (speed_p); - break; + case CLEAR_BY_PIECES: + max_size = STORE_MAX_PIECES; + ratio = CLEAR_RATIO (speed_p); + break; + case MOVE_BY_PIECES: + max_size = MOVE_MAX_PIECES; + ratio = get_move_ratio (speed_p); + break; + case SET_BY_PIECES: + max_size = STORE_MAX_PIECES; + ratio = SET_RATIO (speed_p); + break; + case STORE_BY_PIECES: + max_size = STORE_MAX_PIECES; + ratio = get_move_ratio (speed_p); + break; + case COMPARE_BY_PIECES: + max_size = COMPARE_MAX_PIECES; + /* Pick a likely default, just as in get_move_ratio. */ + ratio = speed_p ? 15 : 3; + break; } - return move_by_pieces_ninsns (size, alignment, max_size + 1) < ratio; + return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio; +} + +/* This hook controls code generation for expanding a memcmp operation by + pieces. Return 1 for the normal pattern of compare/jump after each pair + of loads, or a higher number to reduce the number of branches. */ + +int +default_compare_by_pieces_branch_ratio (machine_mode) +{ + return 1; } bool |