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Improved handling of integer inputs to the new sum() implementation.

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FossilOrigin-Name: 31561c63bde6af2210296810fd66232b935033b4d26273a6b8a52142c54b4e12
This commit is contained in:
drh
2023-07-06 20:34:06 +00:00
parent 68c88ea04f
commit 7d0103bb06
3 changed files with 23 additions and 14 deletions
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23
src/func.c
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@@ -1704,11 +1704,14 @@ static void kahanBabuskaNeumaierStep(
** Add a (possibly large) integer to the running sum.
*/
static void kahanBabuskaNeumaierStepInt64(volatile SumCtx *pSum, i64 iVal){
volatile double rVal = (double)iVal;
kahanBabuskaNeumaierStep(pSum, rVal);
if( iVal<=-4503599627370496 || iVal>=+4503599627370496 ){
double rDiff = (double)(iVal - (i64)rVal);
kahanBabuskaNeumaierStep(pSum, rDiff);
i64 iBig, iSm;
iSm = iVal % 16384;
iBig = iVal - iSm;
kahanBabuskaNeumaierStep(pSum, iBig);
kahanBabuskaNeumaierStep(pSum, iSm);
}else{
kahanBabuskaNeumaierStep(pSum, (double)iVal);
}
}
@@ -1716,11 +1719,17 @@ static void kahanBabuskaNeumaierStepInt64(volatile SumCtx *pSum, i64 iVal){
** Initialize the Kahan-Babaska-Neumaier sum from a 64-bit integer
*/
static void kahanBabuskaNeumaierInit(
volatile SumCtx *pSum,
volatile SumCtx *p,
i64 iVal
){
pSum->rSum = (double)iVal;
pSum->rErr = (double)(iVal - (i64)pSum->rSum);
if( iVal<=-4503599627370496 || iVal>=+4503599627370496 ){
i64 iSm = iVal % 16384;
p->rSum = (double)(iVal - iSm);
p->rErr = (double)iSm;
}else{
p->rSum = (double)iVal;
p->rErr = 0.0;
}
}
/*