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Optimization to the round() SQL function for large input values without a

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fractional part.

FossilOrigin-Name: e95138f5f4febde598f39e031d6e4f4d5ad0adbd8dcdd34fd0baaa78ab393417
This commit is contained in:
drh
2019-05-30 13:47:10 +00:00
parent 05921223c2
commit 84422db987
4 changed files with 14 additions and 12 deletions
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8
src/func.c
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@@ -387,10 +387,10 @@ static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
** handle the rounding directly,
** otherwise use printf.
*/
if( n==0 && r>=0 && r<LARGEST_INT64-1 ){
r = (double)((sqlite_int64)(r+0.5));
}else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 ){
r = -(double)((sqlite_int64)((-r)+0.5));
if( r<-4503599627370496.0 || r>+4503599627370496.0 ){
/* The value has no fractional part so there is nothing to round */
}else if( n==0 ){
r = (double)((sqlite_int64)(r+(r<0?-0.5:+0.5)));
}else{
zBuf = sqlite3_mprintf("%.*f",n,r);
if( zBuf==0 ){