Info
Anchored Decimal
Floating point type is fast, but not accurate.
With finite bits, binary cannot represent decimal fractions.
Fixed point type is accurate, but not independent.
Conversely, more integer digits means fewer fractional digits.
Rust decimal is comfortable, but still a fixed point decimal.
Internally, an integer with a scale factor and a sign bit.
Anchored decimal is fast, accurate, independent, and comfortable.
Natively, two independent integers, each with nineteen digits.
| Operation | AncDec8 | AncDec32 | AncDec | AncDec128 | rust_decimal |
|---|---|---|---|---|---|
| add | 2.8 ns | 4.0 ns | 6.3 ns | 14.5 ns | 11.4 ns |
| sub | 3.2 ns | 3.9 ns | 6.2 ns | 14.9 ns | 11.4 ns |
| mul | 4.4 ns | 4.3 ns | 7.4 ns | 13.5 ns | 11.1 ns |
| div | 3.8 ns | 5.5 ns | 13.4 ns | 20.3 ns | 20.5 ns |
| cmp | 1.2 ns | 3.0 ns | 4.4 ns | 8.0 ns | 5.1 ns |
| parse | 5.7 ns | 10.5 ns | 10.8 ns | 14.6 ns | 10.4 ns |
| Operation | AncDec8 | AncDec32 | AncDec | AncDec128 |
|---|---|---|---|---|
| add | 4.07x | 2.85x | 1.81x | 0.79x |
| sub | 3.56x | 2.92x | 1.84x | 0.77x |
| mul | 2.52x | 2.58x | 1.50x | 0.82x |
| div | 5.39x | 3.73x | 1.53x | 1.01x |
| cmp | 4.25x | 1.70x | 1.16x | 0.64x |
| parse | 1.82x | ~1.0x | ~1.0x | 0.71x |
| Operation | AncDec128 | rust_decimal | Ratio |
|---|---|---|---|
| mul | 19.6 ns | 18.3 ns | 1.07x |
| div | 54.5 ns | 55.8 ns | 0.98x |
| parse | 34.7 ns | 30.3 ns | 1.15x |
AncDec128 is comparable to rust_decimal while supporting 38+38 digit precision vs rust_decimal's 28 shared digits.
Benchmarked on Intel Core i7-10750H @ 2.60GHz, Rust 1.87.0, release mode
https://crates.io/crates/ancdec
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