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big: More ZII refactoring.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:50 +02:00
parent 2e372b33a3
commit d9efa6c8b5
5 changed files with 87 additions and 43 deletions
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core/math/big/helpers.odin
+33 -15
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@@ -328,7 +328,12 @@ minus_one :: proc { int_minus_one, };
power_of_two :: proc(a: ^Int, power: int) -> (err: Error) {
assert_initialized(a);
/*
Check that `a` is usable.
*/
if a == nil {
return .Nil_Pointer_Passed;
}
if power < 0 || power > _MAX_BIT_COUNT {
return .Invalid_Input;
@@ -356,13 +361,17 @@ power_of_two :: proc(a: ^Int, power: int) -> (err: Error) {
/*
Count bits in an `Int`.
*/
count_bits :: proc(a: ^Int) -> (count: int) {
assert_initialized(a);
count_bits :: proc(a: ^Int) -> (count: int, err: Error) {
if a == nil {
return 0, .Nil_Pointer_Passed;
} else if !is_initialized(a) {
return 0, .Int_Not_Initialized;
}
/*
Fast path for zero.
*/
if is_zero(a) {
return 0;
return 0, .OK;
}
/*
Get the number of DIGITs and use it.
@@ -384,7 +393,12 @@ assert_initialized :: proc(a: ^Int, loc := #caller_location) {
}
_zero_unused :: proc(a: ^Int) {
assert_initialized(a);
if a == nil {
return;
} else if !is_initialized(a) {
return;
}
if a.used < len(a.digit) {
mem.zero_slice(a.digit[a.used:]);
}
@@ -397,15 +411,18 @@ _grow_if_uninitialized :: proc(dest: ^Int, minimize := false) -> (err: Error) {
return .OK;
}
clamp :: proc(a: ^Int) {
assert_initialized(a);
/*
Trim unused digits
This is used to ensure that leading zero digits are
trimmed and the leading "used" digit will be non-zero.
Typically very fast. Also fixes the sign if there
are no more leading digits.
*/
/*
Trim unused digits.
This is used to ensure that leading zero digits are trimmed and the leading "used" digit will be non-zero.
Typically very fast. Also fixes the sign if there are no more leading digits.
*/
clamp :: proc(a: ^Int) -> (err: Error) {
if a == nil {
return .Nil_Pointer_Passed;
} else if !is_initialized(a) {
return .Int_Not_Initialized;
}
for a.used > 0 && a.digit[a.used - 1] == 0 {
a.used -= 1;
@@ -414,5 +431,6 @@ clamp :: proc(a: ^Int) {
if is_zero(a) {
a.sign = .Zero_or_Positive;
}
}
return .OK;
}