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json: improved performance for mypower10 (#88)

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Alfred E. Heggestad 2017-10-19 14:05:08 +02:00 • committed by Richard Aas
parent 03841f546b
commit f8b24b462d
1 changed files with 10 additions and 5 deletions
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15
src/json/decode.c
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@ -13,12 +13,17 @@
#include <re_json.h>
static inline uint64_t mypower10(uint64_t e)
static inline long double mypower10(uint64_t e)
{
uint64_t i, n = 1;
long double p = 10, n = 1;
for (i=0; i<e; i++)
n *= 10;
while (e > 0) {
if (e & 1)
n *= p;
p *= p;
e >>= 1;
}
return n;
}
@ -94,7 +99,7 @@ static bool is_number(long double *d, bool *isfloat, const struct pl *pl)
}
}
*isfloat = (frac || (exp && e < 0));
*isfloat = (frac || exp);
if (exp) {
if (e < 0)