database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-09-11 05:52:26 +03:00
Code Activity

Fixing "mtr func_math" failure in the test for MDEV-17643

Browse Source 
Adding an intermediate volatile variable to avoid using co-processor registers
on some platforms (e.g. 32-bit x86).
This change makes test results stable accross all platforms.
This commit is contained in:
Alexander Barkov
2019-03-19 22:14:37 +04:00
parent 3b98c65c4e
commit ef81d2ea64
1 changed files with 3 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
sql/item_sum.cc
View File

@@ -1824,8 +1824,9 @@ static void variance_fp_recurrence_next(double *m, double *s, ulonglong *count,
else
{
double m_kminusone= *m;
*m= m_kminusone + (nr - m_kminusone) / (double) *count;
*s= *s + (nr - m_kminusone) * (nr - *m);
volatile double diff= nr - m_kminusone;
*m= m_kminusone + diff / (double) *count;
*s= *s + diff * (nr - *m);
}
}