- This converts the bits of a standard single-precision float to a non-standard form used on GPUs.
- It rounds the fraction of an IEEE 754 binary32 (single-precision) to binary16 (half-precision) form.
- The result is a 19-bit hybrid binary32/16 with 1 sign bit, 8 exponent bits, and 10 fraction bits.
- The rounding is standard: To nearest, with ties to even. The low 13 bits of the 32-bit result are 0.
- If the input is a binary32 NaN ("Not a Number"), all 10 fraction bits of the result are set to 1.

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