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| author | Jan Hubicka <jh@suse.cz> | 2018-11-28 21:34:06 +0100 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2018-11-28 20:34:06 +0000 |
| commit | 9c7a7155ec779fb56f462cb9b932ad09bc56c92a (patch) | |
| tree | bc57de7d1314bd8ef95aa30587f08d683a5e6512 /gcc/tree-ssa-ifcombine.c | |
| parent | f0dbeec7c506407aa7e02cc2df82057ea40ab457 (diff) | |
| download | gcc-9c7a7155ec779fb56f462cb9b932ad09bc56c92a.zip gcc-9c7a7155ec779fb56f462cb9b932ad09bc56c92a.tar.gz gcc-9c7a7155ec779fb56f462cb9b932ad09bc56c92a.tar.bz2 | |
tree-ssa-ifcombine.c (update_profile_after_ifcombine): Handle profile_probability::always better.
* tree-ssa-ifcombine.c (update_profile_after_ifcombine): Handle
profile_probability::always better.
From-SVN: r266585
Diffstat (limited to 'gcc/tree-ssa-ifcombine.c')
| -rw-r--r-- | gcc/tree-ssa-ifcombine.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/gcc/tree-ssa-ifcombine.c b/gcc/tree-ssa-ifcombine.c index b63c600..2b96937 100644 --- a/gcc/tree-ssa-ifcombine.c +++ b/gcc/tree-ssa-ifcombine.c @@ -360,8 +360,15 @@ update_profile_after_ifcombine (basic_block inner_cond_bb, inner_cond_bb->count = outer_cond_bb->count; - inner_taken->probability = outer2->probability + outer_to_inner->probability - * inner_taken->probability; + /* Handle special case where inner_taken probability is always. In this case + we know that the overall outcome will be always as well, but combining + probabilities will be conservative because it does not know that + outer2->probability is inverse of outer_to_inner->probability. */ + if (inner_taken->probability == profile_probability::always ()) + ; + else + inner_taken->probability = outer2->probability + outer_to_inner->probability + * inner_taken->probability; inner_not_taken->probability = profile_probability::always () - inner_taken->probability; |