@thi.ng/binary/float.js

100+ assorted binary / bitwise operations, conversions, utilities, lookup tables

const F64 = new Float64Array(1);
const F32 = new Float32Array(F64.buffer);
const U8 = new Uint8Array(F64.buffer);
const I32 = new Int32Array(F64.buffer);
const U32 = new Uint32Array(F64.buffer);
const IS_LE = (U32[0] = 1, U8[0] === 1);
const floatToIntBits = (x) => (F32[0] = x, I32[0]);
const floatToUintBits = (x) => (F32[0] = x, U32[0]);
const intBitsToFloat = (x) => (I32[0] = x, F32[0]);
const uintBitsToFloat = (x) => (U32[0] = x, F32[0]);
const floatToIntBits64 = (x) => (F64[0] = x, IS_LE ? [I32[1], I32[0]] : [I32[0], I32[1]]);
const floatToUintBits64 = (x) => (F64[0] = x, IS_LE ? [U32[1], U32[0]] : [U32[0], U32[1]]);
const intBitsToFloat64 = (hi, lo) => {
  IS_LE ? (I32[1] = hi, I32[0] = lo) : (I32[0] = hi, I32[1] = lo);
  return F64[0];
};
const uintBitsToFloat64 = (hi, lo) => {
  IS_LE ? (U32[1] = hi, U32[0] = lo) : (U32[0] = hi, U32[1] = lo);
  return F64[0];
};
const floatToSortableInt = (x) => {
  if (x === 0) return 0;
  const i = floatToIntBits(x);
  return x < 0 ? ~i | 1 << 31 : i;
};
const __f2u = (x, n, p) => x < 0 ? x < -1 ? n : x * n : x > 1 ? p : x * p;
const f32u8 = (x) => __f2u(x, 128, 127) & 255;
const f32u16 = (x) => __f2u(x, 32768, 32767) & 65535;
const f32u24 = (x) => __f2u(x, 8388608, 8388607) & 16777215;
const f32u32 = (x) => __f2u(x, 2147483648, 2147483647) >>> 0;
const u8f32 = (x) => (x &= 255, (x | (x >> 7) * 4294967040) / (127 + (x >> 7)));
const u16f32 = (x) => (x &= 65535, (x | (x >> 15) * 4294901760) / (32767 + (x >> 15)));
const u24f32 = (x) => (x &= 16777215, (x | (x >> 23) * 4278190080) / (8388607 + (x >> 23)));
const u32f32 = (x) => (x | 0) / (2147483647 + (x >>> 31));
export {
  IS_LE,
  f32u16,
  f32u24,
  f32u32,
  f32u8,
  floatToIntBits,
  floatToIntBits64,
  floatToSortableInt,
  floatToUintBits,
  floatToUintBits64,
  intBitsToFloat,
  intBitsToFloat64,
  u16f32,
  u24f32,
  u32f32,
  u8f32,
  uintBitsToFloat,
  uintBitsToFloat64
};