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Overview
| Comment: | Alternative implementation for the internal sqlite3Pow10() utility for MSVC, which is more accurate on that platform. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | 469b96be5350ba2291518280ffe179b8 |
| User & Date: | drh 2018-01-17 21:14:17 |
Context
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2018-01-18
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| 16:52 | Fix to the documentation for sqlite3_trace_v2(). No changes to code. check-in: 6fbd0a11 user: drh tags: trunk | |
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2018-01-17
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| 21:14 | Alternative implementation for the internal sqlite3Pow10() utility for MSVC, which is more accurate on that platform. check-in: 469b96be user: drh tags: trunk | |
| 17:38 | Fix a problem causing the sessions module to occasionally lose track of rows with composite primary keys when there are two rows with the same text value in the leftmost column of the PK. check-in: 09aed136 user: dan tags: trunk | |
Changes
Changes to src/util.c.
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/*
** Compute 10 to the E-th power. Examples: E==1 results in 10.
** E==2 results in 100. E==50 results in 1.0e50.
**
** This routine only works for values of E between 1 and 341.
*/
static LONGDOUBLE_TYPE sqlite3Pow10(int E){
LONGDOUBLE_TYPE x = 10.0;
LONGDOUBLE_TYPE r = 1.0;
while(1){
if( E & 1 ) r *= x;
E >>= 1;
if( E==0 ) break;
x *= x;
}
return r;
}
/*
** The string z[] is an text representation of a real number.
** Convert this string to a double and write it into *pResult.
**
** The string z[] is length bytes in length (bytes, not characters) and
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/*
** Compute 10 to the E-th power. Examples: E==1 results in 10.
** E==2 results in 100. E==50 results in 1.0e50.
**
** This routine only works for values of E between 1 and 341.
*/
static LONGDOUBLE_TYPE sqlite3Pow10(int E){
#if defined(_MSC_VER)
static const LONGDOUBLE_TYPE x[] = {
1.0e+001,
1.0e+002,
1.0e+004,
1.0e+008,
1.0e+016,
1.0e+032,
1.0e+064,
1.0e+128,
1.0e+256
};
LONGDOUBLE_TYPE r = 1.0;
int i;
assert( E>=0 && E<=307 );
for(i=0; E!=0; i++, E >>=1){
if( E & 1 ) r *= x[i];
}
return r;
#else
LONGDOUBLE_TYPE x = 10.0;
LONGDOUBLE_TYPE r = 1.0;
while(1){
if( E & 1 ) r *= x;
E >>= 1;
if( E==0 ) break;
x *= x;
}
return r;
#endif
}
/*
** The string z[] is an text representation of a real number.
** Convert this string to a double and write it into *pResult.
**
** The string z[] is length bytes in length (bytes, not characters) and
|