function computeFloat16ExponentTable() {
    const exponentTable = new Uint32Array(64);
    exponentTable[0] = 0;
    exponentTable[31] = 0x47800000;
    exponentTable[32] = 0x80000000;
    exponentTable[63] = 0xc7800000;
    for(let i = 1; i < 31; i++)exponentTable[i] = i << 23;
    for(let i = 33; i < 63; i++)exponentTable[i] = 0x80000000 + (i - 32 << 23);
    return exponentTable;
}
Computes exponent table for casting Float16 to Float32
See http://www.fox-toolkit.org/ftp/fasthalffloatconversion.pdf

@returns Uint32Array, 64 exponent lookup values.