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value-prof.cc: Correct edge prob calculation.

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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.
This commit is contained in:
Filip Kastl 2023-07-05 17:36:02 +02:00
parent a4778dbd93
commit 1ee710027d
1 changed files with 5 additions and 1 deletions
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6
gcc/value-prof.cc
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@ -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
{