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big: Add binary split factorial.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:52 +02:00
parent cd0ce7b76e
commit 491e4ecc74
6 changed files with 103 additions and 54 deletions
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core/math/big/helpers.odin
+9 -7
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@@ -337,9 +337,7 @@ zero :: clear;
Set the `Int` to 1 and optionally shrink it to the minimum backing size.
*/
int_one :: proc(a: ^Int, minimize := false, allocator := context.allocator) -> (err: Error) {
if err = clear(a, minimize, allocator); err != .None {
return err;
}
if err = clear(a, minimize, allocator); err != .None { return err; }
a.used = 1;
a.digit[0] = 1;
@@ -429,9 +427,7 @@ get_i32 :: proc { int_get_i32, };
and maybe return max(T), .Integer_Overflow if not?
*/
int_get :: proc(a: ^Int, $T: typeid) -> (res: T, err: Error) where intrinsics.type_is_integer(T) {
if err = clear_if_uninitialized(a); err != .None {
return 0, err;
}
if err = clear_if_uninitialized(a); err != .None { return 0, err; }
size_in_bits := int(size_of(T) * 8);
i := int((size_in_bits + _DIGIT_BITS - 1) / _DIGIT_BITS);
@@ -656,4 +652,10 @@ clamp :: proc(a: ^Int) -> (err: Error) {
a.sign = .Zero_or_Positive;
}
return .None;
}
}
_STATIC_ZERO := &Int{
used = 0,
sign = .Zero_or_Positive,
};