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big: Add MATH_BIG_FORCE_64/32_BIT flags.

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This commit is contained in:
Jeroen van Rijn
2021-08-04 00:40:27 +02:00
parent fc0a92f8ac
commit 2323ca1622
3 changed files with 9 additions and 3 deletions
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2
core/math/big/basic.odin
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@@ -1672,7 +1672,7 @@ _int_gcd_lcm :: proc(res_gcd, res_lcm, a, b: ^Int) -> (err: Error) {
}
when size_of(rawptr) == 8 {
when MATH_BIG_FORCE_64_BIT || (!MATH_BIG_FORCE_32_BIT && size_of(rawptr) == 8) {
_factorial_table := [35]_WORD{
/* f(00): */ 1,
/* f(01): */ 1,

8
core/math/big/common.odin
View File

@@ -19,6 +19,12 @@ import "core:intrinsics"
/*
Tunables
*/
MATH_BIG_FORCE_64_BIT :: false;
MATH_BIG_FORCE_32_BIT :: false;
when (MATH_BIG_FORCE_32_BIT && MATH_BIG_FORCE_64_BIT) { #panic("Cannot force 32-bit and 64-bit big backend simultaneously."); };
_LOW_MEMORY :: #config(BIGINT_SMALL_MEMORY, false);
when _LOW_MEMORY {
_DEFAULT_DIGIT_COUNT :: 8;
@@ -140,7 +146,7 @@ _MIN_DIGIT_COUNT :: max(3, ((size_of(u128) + _DIGIT_BITS) - 1) / _DIGIT_BITS);
_MAX_BIT_COUNT :: (max(int) - 2);
_MAX_DIGIT_COUNT :: _MAX_BIT_COUNT / _DIGIT_BITS;
when size_of(rawptr) == 8 {
when MATH_BIG_FORCE_64_BIT || (!MATH_BIG_FORCE_32_BIT && size_of(rawptr) == 8) {
/*
We can use u128 as an intermediary.
*/

2
core/math/big/helpers.odin
View File

@@ -549,7 +549,7 @@ int_random_digit :: proc(r: ^rnd.Rand = nil) -> (res: DIGIT) {
when _DIGIT_BITS == 60 { // DIGIT = u64
return DIGIT(rnd.uint64(r)) & _MASK;
} else when _DIGIT_BITS == 28 { // DIGIT = u32
return DIGIT(rand.uint32(r)) & _MASK;
return DIGIT(rnd.uint32(r)) & _MASK;
} else {
panic("Unsupported DIGIT size.");
}