fp16/lib/getFloat16.js

Half-precision 16-bit floating point numbers

import { float32View } from "./utils.js";
export function getFloat16(view, offset, littleEndian) {
    const value = view.getUint16(offset, littleEndian);
    const sign = value & 0x8000;
    const exponent = value & 0x7c00;
    const mantissa = value & 0x03ff;
    if (exponent === 0) {
        if (mantissa === 0) {
            return sign ? -0 : 0;
        }
        else {
            let e = 127 - 14;
            let m = mantissa;
            while ((m & 0x400) === 0) {
                e--;
                m <<= 1;
            }
            m &= ~0x400;
            const i = (sign << 16) | (e << 23) | (m << 13);
            float32View.setInt32(0, i, littleEndian);
            return float32View.getFloat32(0, littleEndian);
        }
    }
    else if (exponent === 0x7c00) {
        if (mantissa === 0) {
            return sign ? -Infinity : Infinity;
        }
        else {
            return NaN;
        }
    }
    else {
        const e = (exponent + 0x01c000) << 13;
        const m = mantissa << 13;
        const i = (sign << 16) | e | m;
        float32View.setInt32(0, i, littleEndian);
        return float32View.getFloat32(0, littleEndian);
    }
}