diff options
Diffstat (limited to 'gcc/bb-reorder.c')
| -rw-r--r-- | gcc/bb-reorder.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/bb-reorder.c b/gcc/bb-reorder.c index 3bf2dc72c7e..b636c1e3a1d 100644 --- a/gcc/bb-reorder.c +++ b/gcc/bb-reorder.c @@ -2225,7 +2225,15 @@ rest_of_handle_reorder_blocks (void) splitting possibly introduced more crossjumping opportunities. */ cfg_layout_initialize (CLEANUP_EXPENSIVE); - if (flag_reorder_blocks || flag_reorder_blocks_and_partition) + if ((flag_reorder_blocks || flag_reorder_blocks_and_partition) + /* Don't reorder blocks when optimizing for size because extra jump insns may + be created; also barrier may create extra padding. + + More correctly we should have a block reordering mode that tried to + minimize the combined size of all the jumps. This would more or less + automatically remove extra jumps, but would also try to use more short + jumps instead of long jumps. */ + && optimize_function_for_speed_p (cfun)) { reorder_basic_blocks (); cleanup_cfg (CLEANUP_EXPENSIVE); |