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Separate code and provide "double" version. 

SVN revision: 31948
This commit is contained in:
Gustavo Sverzut Barbieri 2007-10-03 14:28:07 +00:00
parent 6a9f664bea
commit 8c9fc0fc42
1 changed files with 44 additions and 11 deletions
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55
legacy/eet/src/lib/eet_data.c
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@ -355,6 +355,46 @@ eet_data_put_string(const void *src, int *size_ret)
return d;
}
/**
* Fast lookups of simple doubles/floats.
*
* These aren't properly a cache because they don't store pre-calculated
* values, but have a so simple math that is almost as fast.
*/
static inline int
_eet_data_float_cache_get(char *s, int len, float *d)
{
/* fast handle of simple case 0xMp+E*/
if ((len == 6) && (s[0] == '0') && (s[1] == 'x') && (s[3] == 'p'))
{
int mantisse = (s[2] >= 'a') ? (s[2] - 'a' + 10) : (s[2] - '0');
int exponent = (s[5] - '0');
if (s[4] == '+') *d = (float)(mantisse << exponent);
else *d = (float)mantisse / (float)(1 << exponent);
return 1;
}
return 0;
}
static inline int
_eet_data_double_cache_get(char *s, int len, double *d)
{
/* fast handle of simple case 0xMp+E*/
if ((len == 6) && (s[0] == '0') && (s[1] == 'x') && (s[3] == 'p'))
{
int mantisse = (s[2] >= 'a') ? (s[2] - 'a' + 10) : (s[2] - '0');
int exponent = (s[5] - '0');
if (s[4] == '+') *d = (double)(mantisse << exponent);
else *d = (double)mantisse / (double)(1 << exponent);
return 1;
}
return 0;
}
/* FLOAT TYPE */
static int
eet_data_get_float(void *src, void *src_end, void *dst)
@ -371,17 +411,7 @@ eet_data_get_float(void *src, void *src_end, void *dst)
len = 0;
while ((p < (char *)src_end) && (*p != 0)) {len++; p++;}
/* fast handle of simple case 0xMp+E*/
if ((len == 6) && (s[0] == '0') && (s[1] == 'x') && (s[3] == 'p'))
{
int mantisse = (s[2] >= 'a') ? (s[2] - 'a' + 10) : (s[2] - '0');
int exponent = 1 << (s[5] - '0');
if (s[4] == '+') *d = ((float)mantisse) * (float)exponent;
else *d = ((float)mantisse) / (float)exponent;
return len + 1;
}
if (_eet_data_float_cache_get(s, len, d) != 0) return len + 1;
str = alloca(len + 1);
memcpy(str, s, len);
@ -425,6 +455,9 @@ eet_data_get_double(void *src, void *src_end, void *dst)
p = s;
len = 0;
while ((p < (char *)src_end) && (*p != 0)) {len++; p++;}
if (_eet_data_double_cache_get(s, len, d) != 0) return len + 1;
str = alloca(len + 1);
memcpy(str, s, len);
str[len] = '\0';