Module bignum
Custom arbitrary-precision number (bignum) implementation.
This is designed to avoid the heap allocation at expense of stack memory.
The most used bignum type, Big32x40 and Big64x20 you can choose, is limited by 32 × 40 = 1,280 bits
and will take at most 160 bytes of stack memory. This is more than enough
for round-tripping all possible finite f64 values.
In principle it is possible to have multiple bignum types for different inputs, but we don't do so to avoid the code bloat. Each bignum is still tracked for the actual usages, so it normally doesn't matter.
Modules
Structs
- Big64x20 Stack-allocated arbitrary-precision (up to certain limit) integer.
Traits
- FullOps Arithmetic operations required by bignums.
Type Aliases
Constants
-
SMALL_POW5
Table of powers of 5 representable in digits. Specifically, the largest {u8, u16, u32, u64} value
that's a power of five, plus the corresponding exponent. Used in
mul_pow5.