Brunobkr/llama.cpp_AlgMor24_github

1'use strict';2 3var $pow = require('math-intrinsics/pow');4 5module.exports = function bytesAsFloat64(rawBytes) {6	// return new $Float64Array(new $Uint8Array(rawBytes).buffer)[0];7 8	/*9    Let value be the byte elements of rawBytes concatenated and interpreted as a little-endian bit string encoding of an IEEE 754-2008 binary64 value.10If value is an IEEE 754-2008 binary64 NaN value, return the NaN Number value.11Return the Number value that corresponds to value.12    */13	var sign = rawBytes[7] & 0x80 ? -1 : 1; // first bit14	var exponent = ((rawBytes[7] & 0x7F) << 4) // 7 bits from index 715        | ((rawBytes[6] & 0xF0) >> 4); // 4 bits from index 616	var mantissa = ((rawBytes[6] & 0x0F) * 0x1000000000000) // 4 bits from index 617        + (rawBytes[5] * 0x10000000000) // 8 bits from index 518        + (rawBytes[4] * 0x100000000) // 8 bits from index 419        + (rawBytes[3] * 0x1000000) // 8 bits from index 320        + (rawBytes[2] * 0x10000) // 8 bits from index 221        + (rawBytes[1] * 0x100) // 8 bits from index 122        + rawBytes[0]; // 8 bits from index 023 24	if (exponent === 0 && mantissa === 0) {25		return sign * 0;26	}27	if (exponent === 0x7FF && mantissa !== 0) {28		return NaN;29	}30	if (exponent === 0x7FF && mantissa === 0) {31		return sign * Infinity;32	}33 34	exponent -= 1023; // subtract the bias35 36	// Handle subnormal numbers37	if (exponent === -1023) {38		return sign * mantissa * 5e-324; // $pow(2, -1022 - 52)39	}40 41	return sign * (1 + (mantissa / 0x10000000000000)) * $pow(2, exponent);42};43