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libgcov: improve profile reproducibility

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libgcc/ChangeLog:

	PR gcov-profile/98739
	* libgcov.h (gcov_topn_add_value): Do not train when
	we have a merged profile with a negative number of total
	value.
This commit is contained in:
Martin Liska 2021-01-26 12:44:34 +01:00
parent 80198c701a
commit d40b21eebc
1 changed files with 7 additions and 1 deletions
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8
libgcc/libgcov.h
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@ -443,7 +443,13 @@ gcov_topn_add_value (gcov_type *counters, gcov_type value, gcov_type count,
int use_atomic, int increment_total)
{
if (increment_total)
gcov_counter_add (&counters[0], 1, use_atomic);
{
/* In the multi-threaded mode, we can have an already merged profile
with a negative total value. In that case, we should bail out. */
if (counters[0] < 0)
return 0;
gcov_counter_add (&counters[0], 1, use_atomic);
}
struct gcov_kvp *prev_node = NULL;
struct gcov_kvp *minimal_node = NULL;