diff options
| author | tejohnson <tejohnson@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-10-03 05:06:05 +0000 |
|---|---|---|
| committer | tejohnson <tejohnson@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-10-03 05:06:05 +0000 |
| commit | dcc9b35150e6197e978d0af10b4549c5c3f20e43 (patch) | |
| tree | d85c8dce4505e035ecaa38597a50dd80df80808e /gcc/bb-reorder.c | |
| parent | a99f9d9131a7d307f4105113d988dd69bc331337 (diff) | |
| download | gcc-dcc9b35150e6197e978d0af10b4549c5c3f20e43.tar.gz | |
2013-10-02 Teresa Johnson <tejohnson@google.com>
* predict.c (probably_never_executed): New function.
(probably_never_executed_bb_p): Invoke probably_never_executed.
(probably_never_executed_edge_p): Ditto.
* bb-reorder.c (find_rarely_executed_basic_blocks_and_crossing_edges):
Treat profile insanities conservatively.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@203152 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/bb-reorder.c')
| -rw-r--r-- | gcc/bb-reorder.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/bb-reorder.c b/gcc/bb-reorder.c index b89f9855e77..c5a42d359dc 100644 --- a/gcc/bb-reorder.c +++ b/gcc/bb-reorder.c @@ -1564,8 +1564,24 @@ find_rarely_executed_basic_blocks_and_crossing_edges (void) /* Mark which partition (hot/cold) each basic block belongs in. */ FOR_EACH_BB (bb) { + bool cold_bb = false; + if (probably_never_executed_bb_p (cfun, bb)) { + /* Handle profile insanities created by upstream optimizations + by also checking the incoming edge weights. If there is a non-cold + incoming edge, conservatively prevent this block from being split + into the cold section. */ + cold_bb = true; + FOR_EACH_EDGE (e, ei, bb->preds) + if (!probably_never_executed_edge_p (cfun, e)) + { + cold_bb = false; + break; + } + } + if (cold_bb) + { BB_SET_PARTITION (bb, BB_COLD_PARTITION); cold_bb_count++; } |