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Alternative implementation for the internal sqlite3Pow10() utility for MSVC,

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which is more accurate on that platform.

FossilOrigin-Name: 469b96be5350ba2291518280ffe179b87aa7fbe701e2813ef63843922771517a
This commit is contained in:
drh
2018-01-17 21:14:17 +00:00
parent 61c758b53a
commit 3dc9727782
3 changed files with 29 additions and 8 deletions
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21
src/util.c
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@@ -327,6 +327,26 @@ int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
** 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){
@@ -336,6 +356,7 @@ static LONGDOUBLE_TYPE sqlite3Pow10(int E){
x *= x;
}
return r;
#endif
}
/*