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| author | Filip Kastl <filip.kastl@gmail.com> | 2023-07-05 17:36:02 +0200 |
|---|---|---|
| committer | Filip Kastl <filip.kastl@gmail.com> | 2023-07-05 17:36:02 +0200 |
| commit | 1ee710027d8aa16145dab623815d9f9921cf9633 (patch) | |
| tree | 46d25a8cdad22c0ca6281668435317342ecf6a35 | |
| parent | a4778dbd935d4e26b41e5c0e6191b7311457b239 (diff) | |
| download | gcc-1ee710027d8aa16145dab623815d9f9921cf9633.zip gcc-1ee710027d8aa16145dab623815d9f9921cf9633.tar.gz gcc-1ee710027d8aa16145dab623815d9f9921cf9633.tar.bz2 | |
value-prof.cc: Correct edge prob calculation.
The mod-subtract optimization with ncounts==1 produced incorrect edge
probabilities due to incorrect conditional probability calculation. This
patch fixes the calculation.
Signed-off-by: Filip Kastl <filip.kastl@gmail.com>
gcc/ChangeLog:
* value-prof.cc (gimple_mod_subtract_transform): Correct edge
prob calculation.
| -rw-r--r-- | gcc/value-prof.cc | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/value-prof.cc b/gcc/value-prof.cc index f40e58a..5033a6f 100644 --- a/gcc/value-prof.cc +++ b/gcc/value-prof.cc @@ -1186,7 +1186,11 @@ gimple_mod_subtract_transform (gimple_stmt_iterator *si) if (all > 0) { prob1 = profile_probability::probability_in_gcov_type (count1, all); - prob2 = profile_probability::probability_in_gcov_type (count2, all); + if (all == count1) + prob2 = profile_probability::even (); + else + prob2 = profile_probability::probability_in_gcov_type (count2, all + - count1); } else { |