139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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* Copyright (C) 2018-2019 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _HALF_FLOAT_H_
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#define _HALF_FLOAT_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include "util/u_cpu_detect.h"
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#if defined(USE_X86_64_ASM)
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#include <immintrin.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define FP16_ONE ((uint16_t) 0x3c00)
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#define FP16_ZERO ((uint16_t) 0)
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uint16_t _mesa_float_to_half_slow(float val);
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float _mesa_half_to_float_slow(uint16_t val);
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uint8_t _mesa_half_to_unorm8(uint16_t v);
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uint16_t _mesa_uint16_div_64k_to_half(uint16_t v);
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/*
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* _mesa_float_to_float16_rtz_slow is no more than a wrapper to the counterpart
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* softfloat.h call. Still, softfloat.h conversion API is meant to be kept
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* private. In other words, only use the API published here, instead of
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* calling directly the softfloat.h one.
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*/
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uint16_t _mesa_float_to_float16_rtz_slow(float val);
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static inline uint16_t
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_mesa_float_to_half(float val)
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{
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#if defined(USE_X86_64_ASM)
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if (util_get_cpu_caps()->has_f16c) {
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__m128 in = {val};
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__m128i out;
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/* $0 = round to nearest */
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__asm volatile("vcvtps2ph $0, %1, %0" : "=v"(out) : "v"(in));
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return out[0];
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}
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#endif
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return _mesa_float_to_half_slow(val);
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}
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static inline float
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_mesa_half_to_float(uint16_t val)
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{
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#if defined(USE_X86_64_ASM)
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if (util_get_cpu_caps()->has_f16c) {
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__m128i in = {val};
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__m128 out;
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__asm volatile("vcvtph2ps %1, %0" : "=v"(out) : "v"(in));
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return out[0];
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}
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#endif
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return _mesa_half_to_float_slow(val);
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}
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static inline uint16_t
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_mesa_float_to_float16_rtz(float val)
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{
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#if defined(USE_X86_64_ASM)
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if (util_get_cpu_caps()->has_f16c) {
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__m128 in = {val};
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__m128i out;
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/* $3 = round towards zero (truncate) */
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__asm volatile("vcvtps2ph $3, %1, %0" : "=v"(out) : "v"(in));
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return out[0];
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}
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#endif
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return _mesa_float_to_float16_rtz_slow(val);
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}
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static inline uint16_t
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_mesa_float_to_float16_rtne(float val)
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{
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return _mesa_float_to_half(val);
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}
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static inline bool
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_mesa_half_is_negative(uint16_t h)
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{
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return !!(h & 0x8000);
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}
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#ifdef __cplusplus
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/* Helper class for disambiguating fp16 from uint16_t in C++ overloads */
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struct float16_t {
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uint16_t bits;
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float16_t(float f) : bits(_mesa_float_to_half(f)) {}
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float16_t(double d) : bits(_mesa_float_to_half(d)) {}
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float16_t(uint16_t raw_bits) : bits(raw_bits) {}
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static float16_t one() { return float16_t(FP16_ONE); }
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static float16_t zero() { return float16_t(FP16_ZERO); }
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};
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#endif
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#ifdef __cplusplus
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} /* extern C */
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#endif
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#endif /* _HALF_FLOAT_H_ */
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