Noah Andrews NoahAndrews
NoahAndrews
/ multiplyFloat.js
Last active
July 23, 2024 03:13
— forked from wchargin/multiplyFloat.js
multiply bigint by float in JS (spoiler alert: BigInt has no useful functions)
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| // Copied under the MIT license from https://gist.githubusercontent.com/wchargin/93062064e1ec0e3383b91b921da86048/raw/191a10b5ea5169a6c5c436a172353002e653b04c/multiplyFloat.js | |
| /** | |
| * For a finite normal 64-bit float `f`, extracts integers `sgn`, | |
| * `exponent`, and `mantissa` such that: | |
| * | |
| * - `sgn` is -1 or +1 | |
| * - `exponent` is between -1023 and 1024, inclusive | |
| * - `mantissa` is between 0 and 2^51 - 1, inclusive | |
| * - the number given by `f` equals `sgn * 2^exponent * (1 + mantissa / 2^52)` |