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Overview
| Comment: | Changes to internal AtoF to improve "accuracy" when measured against built-in GCC atof(). |
|---|---|
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| Timelines: | family | ancestors | descendants | both | trunk |
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| SHA1: |
438e1577d0f9ceb2851ee0df0df18f02 |
| User & Date: | shane 2009-09-07 02:46:32 |
Context
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2009-09-07
| ||
| 03:48 | Attempt to handle numbers at the limits of the IEEE 754 range better (nan.test now passes). check-in: 2a74ae19 user: shane tags: trunk | |
| 02:46 | Changes to internal AtoF to improve "accuracy" when measured against built-in GCC atof(). check-in: 438e1577 user: shane tags: trunk | |
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2009-09-03
| ||
| 16:23 | Add the "unix-wfl" VFS that does whole-file locking in order to help NFS do better cache coherency. check-in: 2aeab80e user: drh tags: trunk | |
Changes
Changes to src/util.c.
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/* In the IEEE 754 standard, zero is signed.
** Add the sign if we've seen at least one digit */
result = (sign<0 && nDigits) ? -(double)0 : (double)0;
} else {
/* attempt to reduce exponent */
if( esign>0 ){
while( s<(LARGEST_INT64/10) && e>0 ) e--,s*=10;
}
/* adjust the sign of significand */
s = sign<0 ? -s : s;
/* if exponent, scale significand as appropriate
** and store in result. */
if( e ){
double scale = 1.0;
while( e>=16 ){ scale *= 1.0e+16; e -= 16; }
while( e>=4 ){ scale *= 1.0e+4; e -= 4; }
while( e>=1 ){ scale *= 1.0e+1; e -= 1; }
if( esign<0 ){
result = s / scale;
}else{
result = s * scale;
}
} else {
result = (double)s;
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> > | > | | |
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/* In the IEEE 754 standard, zero is signed.
** Add the sign if we've seen at least one digit */
result = (sign<0 && nDigits) ? -(double)0 : (double)0;
} else {
/* attempt to reduce exponent */
if( esign>0 ){
while( s<(LARGEST_INT64/10) && e>0 ) e--,s*=10;
}else{
while( !(s%10) && e>0 ) e--,s/=10;
}
/* adjust the sign of significand */
s = sign<0 ? -s : s;
/* if exponent, scale significand as appropriate
** and store in result. */
if( e ){
double scale = 1.0;
/* 1.0e+22 is the largest power of 10 than can be
** represented exactly. */
while( e%22 ) { scale *= 1.0e+1; e -= 1; }
while( e>0 ) { scale *= 1.0e+22; e -= 22; }
if( esign<0 ){
result = s / scale;
}else{
result = s * scale;
}
} else {
result = (double)s;
|