1 /*- 2 * Copyright (c) 2015 Dag-Erling Smørgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef FP16_H_INCLUDED 30 #define FP16_H_INCLUDED 31 32 typedef signed long long fp16_t; 33 34 #define ItoFP16(n) ((signed long long)(n) << 16) 35 #define FP16toI(n) ((signed long long)(n) >> 16) 36 37 #ifndef _KERNEL 38 #define FP16toF(n) ((n) / 65536.0) 39 #endif 40 41 /* add a and b */ 42 static inline fp16_t 43 fp16_add(fp16_t a, fp16_t b) 44 { 45 46 return (a + b); 47 } 48 49 /* subtract b from a */ 50 static inline fp16_t 51 fp16_sub(fp16_t a, fp16_t b) 52 { 53 54 return (a - b); 55 } 56 57 /* multiply a by b */ 58 static inline fp16_t 59 fp16_mul(fp16_t a, fp16_t b) 60 { 61 62 return (a * b >> 16); 63 } 64 65 /* divide a by b */ 66 static inline fp16_t 67 fp16_div(fp16_t a, fp16_t b) 68 { 69 70 return ((a << 16) / b); 71 } 72 73 /* square root */ 74 fp16_t fp16_sqrt(fp16_t); 75 76 #define FP16_2PI 411774 77 #define FP16_PI 205887 78 #define FP16_PI_2 102943 79 #define FP16_PI_4 51471 80 81 /* sine and cosine */ 82 fp16_t fp16_sin(fp16_t); 83 fp16_t fp16_cos(fp16_t); 84 85 #endif 86