chromium/third_party/fp16/src/include/fp16/fp16.h

#pragma once
#ifndef FP16_FP16_H
#define FP16_FP16_H

#if defined(__cplusplus) && (__cplusplus >= 201103L)
	#include <cstdint>
	#include <cmath>
#elif !defined(__OPENCL_VERSION__)
	#include <stdint.h>
	#include <math.h>
#endif

#ifdef _MSC_VER
	#include <intrin.h>
#endif

#include <fp16/bitcasts.h>


/*
 * Convert a 16-bit floating-point number in IEEE half-precision format, in bit representation, to
 * a 32-bit floating-point number in IEEE single-precision format, in bit representation.
 *
 * @note The implementation doesn't use any floating-point operations.
 */
static inline uint32_t fp16_ieee_to_fp32_bits(uint16_t h) { … }

/*
 * Convert a 16-bit floating-point number in IEEE half-precision format, in bit representation, to
 * a 32-bit floating-point number in IEEE single-precision format.
 *
 * @note The implementation relies on IEEE-like (no assumption about rounding mode and no operations on denormals)
 * floating-point operations and bitcasts between integer and floating-point variables.
 */
static inline float fp16_ieee_to_fp32_value(uint16_t h) { … }

/*
 * Convert a 32-bit floating-point number in IEEE single-precision format to a 16-bit floating-point number in
 * IEEE half-precision format, in bit representation.
 *
 * @note The implementation relies on IEEE-like (no assumption about rounding mode and no operations on denormals)
 * floating-point operations and bitcasts between integer and floating-point variables.
 */
static inline uint16_t fp16_ieee_from_fp32_value(float f) { … }

/*
 * Convert a 16-bit floating-point number in ARM alternative half-precision format, in bit representation, to
 * a 32-bit floating-point number in IEEE single-precision format, in bit representation.
 *
 * @note The implementation doesn't use any floating-point operations.
 */
static inline uint32_t fp16_alt_to_fp32_bits(uint16_t h) { … }

/*
 * Convert a 16-bit floating-point number in ARM alternative half-precision format, in bit representation, to
 * a 32-bit floating-point number in IEEE single-precision format.
 *
 * @note The implementation relies on IEEE-like (no assumption about rounding mode and no operations on denormals)
 * floating-point operations and bitcasts between integer and floating-point variables.
 */
static inline float fp16_alt_to_fp32_value(uint16_t h) { … }

/*
 * Convert a 32-bit floating-point number in IEEE single-precision format to a 16-bit floating-point number in
 * ARM alternative half-precision format, in bit representation.
 *
 * @note The implementation relies on IEEE-like (no assumption about rounding mode and no operations on denormals)
 * floating-point operations and bitcasts between integer and floating-point variables.
 */
static inline uint16_t fp16_alt_from_fp32_value(float f) { … }

#endif /* FP16_FP16_H */