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bigint: Add count_bits and more prep.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:50 +02:00
parent dfd5a993a2
commit 905d5459a9
4 changed files with 41 additions and 20 deletions
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core/math/bigint/bigint.odin
+15 -16
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@@ -9,6 +9,8 @@ package bigint
The code started out as an idiomatic source port of libTomMath, which is in the public domain, with thanks.
*/
import "core:intrinsics"
/*
Tunables
*/
@@ -97,26 +99,23 @@ when size_of(rawptr) == 8 {
/*
We can use u128 as an intermediary.
*/
DIGIT :: distinct(u64);
_DIGIT_BITS :: 60;
_WORD :: u128;
_MAX_COMBA :: 1 << (128 - (2 * _DIGIT_BITS)) ;
_WARRAY :: 1 << ((128 - (2 * _DIGIT_BITS)) + 1);
DIGIT :: distinct(u64);
_WORD :: distinct(u128);
} else {
DIGIT :: distinct(u32);
_DIGIT_BITS :: 28;
_WORD :: u64;
_MAX_COMBA :: 1 << ( 64 - (2 * _DIGIT_BITS)) ;
_WARRAY :: 1 << (( 64 - (2 * _DIGIT_BITS)) + 1);
DIGIT :: distinct(u32);
_WORD :: distinct(u64);
}
#assert(size_of(_WORD) == 2 * size_of(DIGIT));
_MASK :: (DIGIT(1) << DIGIT(_DIGIT_BITS)) - DIGIT(1);
_DIGIT_MAX :: _MASK;
_BITS_IN_BYTE :: 8;
_BITS_IN_TYPE :: #force_inline proc($T) -> int where intrinsics.type_is_integer(T) {
return _BITS_IN_BYTE * size_of(T);
}
_DIGIT_TYPE_BITS :: 8 * size_of(DIGIT);
_WORD_TYPE_BITS :: 8 * size_of(_WORD);
_DIGIT_BITS :: _DIGIT_TYPE_BITS - 4;
_MASK :: (DIGIT(1) << DIGIT(_DIGIT_BITS)) - DIGIT(1);
_DIGIT_MAX :: _MASK;
_MAX_COMBA :: 1 << (_WORD_TYPE_BITS - (2 * _DIGIT_BITS)) ;
_WARRAY :: 1 << ((_WORD_TYPE_BITS - (2 * _DIGIT_BITS)) + 1);
Order :: enum i8 {
LSB_First = -1,