math.big: faster integer_from_radix()

[tankf33der]

Lets make integer_from_radix() faster too.
Use the same mechanism to calculate more digits at once as in radix_str().

o) ~10 times faster
o) these two functions tested together in 1M loop against gmp.

[huly-for-github]

Connected to Huly®: V_0.6-23031

[enghitalo]

Can you, please, provide the benchmark code?

[tankf33der]

Cam you, please, provide the benchmark code?

Sure.
http://pb1n.de/?9655c8

Again code without benchmarks. 180k+ digit.
I compiled in -prod and used util 'time'.

[spytheman]

It is indeed a lot faster, for very big numbers:

#0 10:42:40 ^ master ~/v>./v -o xold x.v
#0 10:42:46 ^ master ~/v>git switch -
Switched to branch 'from_radix'
#0 10:42:48 ^ from_radix ~/v>./v -o xnew x.v
#0 10:42:51 ^ from_radix ~/v>
#0 10:42:52 ^ from_radix ~/v>
#0 10:42:53 ^ from_radix ~/v>ls -larS xold xnew
-rwxrwxr-x 1 delian delian 802745 Jun  9 10:42 xold
-rwxrwxr-x 1 delian delian 806954 Jun  9 10:42 xnew
#0 10:42:57 ^ from_radix ~/v>
#0 10:42:58 ^ from_radix ~/v>time ./xold
 SPENT 20503.204 ms in integer_from_string

real    0m20.507s
user    0m20.441s
sys     0m0.036s
#0 10:43:24 ^ from_radix ~/v>time ./xnew
 SPENT  2264.233 ms in integer_from_string

real    0m2.269s
user    0m2.263s
sys     0m0.004s
#0 10:43:30 ^ from_radix ~/v>

Excellent work.