diff options
| author | Teresa Johnson <tejohnson@google.com> | 2013-04-29 13:22:46 +0000 |
|---|---|---|
| committer | Teresa Johnson <tejohnson@gcc.gnu.org> | 2013-04-29 13:22:46 +0000 |
| commit | f41f80f90846d26a89ed5a6440bc283b745235ac (patch) | |
| tree | 9daf54908866e15052bfcfc011bc4753b4b363fb /gcc/gimple-streamer-in.c | |
| parent | 315bbd2e3c15dea3528259be2aee2876dec33843 (diff) | |
This patch fixes PR bootstrap/57077.
This patch fixes PR bootstrap/57077. Certain new uses of apply_probability
are actually scaling the counts up, and the scale factor should not
be treated as a probability as the value may exceed REG_BR_PROB_BASE.
One example (from the PR) is when scaling counts up in LTO when merging
profiles. Another example I found when preparing the patch to use
the rounding divide in more places is when inlining COMDAT functions.
Add new helper function apply_scale that does the scaling without
the probability range check. I audited the new uses of apply_probability
and changed the calls as appropriate.
2013-04-29 Teresa Johnson <tejohnson@google.com>
PR bootstrap/57077
* basic-block.h (apply_scale): New function.
(apply_probability): Use apply_scale.
* gimple-streamer-in.c (input_bb): Ditto.
* lto-streamer-in.c (input_cfg): Ditto.
* lto-cgraph.c (merge_profile_summaries): Ditto.
* tree-optimize.c (execute_fixup_cfg): Ditto.
* tree-inline.c (copy_bb): Update comment to use
apply_scale.
(copy_edges_for_bb): Ditto.
(copy_cfg_body): Ditto.
From-SVN: r198416
Diffstat (limited to 'gcc/gimple-streamer-in.c')
| -rw-r--r-- | gcc/gimple-streamer-in.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/gimple-streamer-in.c b/gcc/gimple-streamer-in.c index a27f0d6d62f..03fbe91bbe2 100644 --- a/gcc/gimple-streamer-in.c +++ b/gcc/gimple-streamer-in.c @@ -329,8 +329,8 @@ input_bb (struct lto_input_block *ib, enum LTO_tags tag, index = streamer_read_uhwi (ib); bb = BASIC_BLOCK_FOR_FUNCTION (fn, index); - bb->count = apply_probability (streamer_read_gcov_count (ib), - count_materialization_scale); + bb->count = apply_scale (streamer_read_gcov_count (ib), + count_materialization_scale); bb->frequency = streamer_read_hwi (ib); bb->flags = streamer_read_hwi (ib); |