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Revert "Remove use of volatile in stored_field_cmp_to_item"

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This reverts commit 7603463a46b288c1b5630348e36c622e4c2abb09.

The commit itself is fine, however when disabling volatile, compiler
optimizations mess up our double results due to precision differences.
Revert the patch till a proper solution is found.
This commit is contained in:
Vicențiu Ciorbaru 2017-12-06 02:16:14 +02:00
parent 7603463a46
commit ac61a575df
1 changed files with 7 additions and 2 deletions
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9
sql/item.cc
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@ -8924,10 +8924,15 @@ int stored_field_cmp_to_item(THD *thd, Field *field, Item *item)
}
return my_time_compare(&field_time, &item_time);
}
double result= item->val_real();
/*
The patch for Bug#13463415 started using this function for comparing
BIGINTs. That uncovered a bug in Visual Studio 32bit optimized mode.
Prefixing the auto variables with volatile fixes the problem....
*/
volatile double result= item->val_real();
if (item->null_value)
return 0;
double field_result= field->val_real();
volatile double field_result= field->val_real();
if (field_result < result)
return -1;
else if (field_result > result)