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fp16private.h


products/Sources/formale Sprachen/C/Gnome/gsk/gl/fp16private.h

/* fp16private.h * * Copyright 2021 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see . * * SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once #include G_BEGIN_DECLS #define FP16_ZERO ((guint16)0) #define FP16_ONE ((guint16)15360) #define FP16_MINUS_ONE ((guint16)48128) static inline guint as_uint (const float x) { return *(guint*)&x; } static inline float as_float (const guint x) { return *(float*)&x; } // IEEE-754 16-bit floating-point format (without infinity): 1-5-10 static inline float half_to_float_one (const guint16 x) { const guint e = (x & 0x7C00) >> 10; // exponent const guint m = (x & 0x03FF) << 13; // mantissa const guint v = as_uint ((float) m) >> 23; guint normalized = 0; guint denormalized = 0; if (e != 0) normalized = (e + 112) << 23 | m; if (e == 0 && m != 0) denormalized = (v - 37) << 23 | ((m << (150 - v)) & 0x007FE000); return as_float ((x & 0x8000u) << 16 | normalized | denormalized); } static inline guint16 float_to_half_one (const float x) { const guint b = *(guint*)&x+0x00001000; // round-to-nearest-even const guint e = (b&0x7F800000)>>23; // exponent const guint m = b&0x007FFFFF; // mantissa guint n0 = 0; guint n1 = 0; guint n2 = 0; if (e > 112) n0 = (((e - 112) << 10) & 0x7C00) | m >> 13; if (e < 113 && e > 101) n1 = (((0x007FF000 + m) >> (125- e)) + 1) >> 1; if (e > 143) n2 = 0x7FFF; return (b & 0x80000000) >> 16 | n0 | n1 | n2; // sign : normalized : denormalized : saturate } void float_to_half4 (const float f[4], guint16 h[4]); void half_to_float4 (const guint16 h[4], float f[4]); void float_to_half (const float *f, guint16 *h, int n); void half_to_float (const guint16 *h, float *f, int n); void float_to_half4_f16c (const float f[4], guint16 h[4]); void half_to_float4_f16c (const guint16 h[4], float f[4]); void float_to_half_f16c (const float *f, guint16 *h, int n); void half_to_float_f16c (const guint16 *h, float *f, int n); void float_to_half4_c (const float f[4], guint16 h[4]); void half_to_float4_c (const guint16 h[4], float f[4]); void float_to_half_c (const float *f, guint16 *h, int n); void half_to_float_c (const guint16 *h, float *f, int n); G_END_DECLS

                                                                                                                                                                                                                                                                                                                                                                                                     

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