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big: Add Frobenius-Underwood.

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Jeroen van Rijn
2021-09-03 01:25:18 +02:00
parent 7fa04fa018
commit eecc786bd2
4 changed files with 117 additions and 18 deletions
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core/math/big/internal.odin
+11 -1
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@@ -2019,8 +2019,18 @@ internal_invmod :: proc{ internal_int_inverse_modulo, };
/*
Helpers to extract values from the `Int`.
*/
internal_int_bitfield_extract_bool :: proc(a: ^Int, offset: int) -> (val: bool, err: Error) {
limb := offset / _DIGIT_BITS;
if limb < 0 || limb >= a.used { return false, .Invalid_Argument; }
i := _WORD(1 << _WORD((offset % _DIGIT_BITS)));
return bool(_WORD(a.digit[limb]) & i), nil;
}
internal_int_bitfield_extract_single :: proc(a: ^Int, offset: int) -> (bit: _WORD, err: Error) {
return #force_inline int_bitfield_extract(a, offset, 1);
limb := offset / _DIGIT_BITS;
if limb < 0 || limb >= a.used { return 0, .Invalid_Argument; }
i := _WORD(1 << _WORD((offset % _DIGIT_BITS)));
return 1 if ((_WORD(a.digit[limb]) & i) != 0) else 0, nil;
}
internal_int_bitfield_extract :: proc(a: ^Int, offset, count: int) -> (res: _WORD, err: Error) #no_bounds_check {