/**************************************************************************** * include/nuttx/math32.h * * Copyright (C) 2016 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef __INCLUDE_NUTTX_MATH32_H #define __INCLUDE_NUTTX_MATH32_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include /**************************************************************************** * Public Types ****************************************************************************/ /* These types are useful on platforms that do not support 64-bit types. */ struct int64_s { #ifdef CONFIG_ENDIAN_BIG int32_t ms; uint32_t ls; #else uint32_t ls; int32_t ms; #endif }; struct uint64_s { #ifdef CONFIG_ENDIAN_BIG uint32_t ms; uint32_t ls; #else uint32_t ls; uint32_t ms; #endif }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: uneg64 * * Description: * Negate a 64-bit unsigned value. * * Input Parameters: * value - The value to be negated. * ****************************************************************************/ /* void uneg64(FAR const uint64_s *value); */ #define uneg64(value) \ do \ { \ value->ms = ~value->ms; \ value->ls = -value->ls; \ if (value->ls == 0) \ { \ value->ms++; \ } \ } \ while (0) /**************************************************************************** * Name: uadd32x64 * * Description: * Add a 32-bit value to a 64-bit values and return the truncated 64-bit * sum. * * Input Parameters: * term1 and term2 - The values to be added * sum - The location to return the product of the two values. sum may * be one of term1 or term2 * ****************************************************************************/ void uadd32x64(uint32_t term1, FAR const struct uint64_s *term2, FAR struct uint64_s *sum); /**************************************************************************** * Name: uadd64 * * Description: * Add two 64-bit values and return a 64-bit sum. * * Input Parameters: * term1 and term2 - The values to be added * sum - The location to return the product of the two values. sum may * be one of term1 or term2 * ****************************************************************************/ void uadd64(FAR const struct uint64_s *term1, FAR const struct uint64_s *term2, FAR struct uint64_s *sum); /**************************************************************************** * Name: usub64x32 * * Description: * Subtract a 32-bit value from a 64-bit value and return the 64-bit * difference. * * Input Parameters: * minuend - The number from which another number (the Subtrahend) is * to be subtracted. * subtrahend - The number that is to be subtracted. * difference - The location to return the difference of the two values. * difference may the same as one of minuend or subtrahend. * ****************************************************************************/ void usub64x32(FAR const struct uint64_s *minuend, uint32_t subtrahend, FAR struct uint64_s *difference); /**************************************************************************** * Name: usub64 * * Description: * Subtract two 64-bit values and return the 64-bit difference. * * Input Parameters: * minuend - The number from which another number (the Subtrahend) is * to be subtracted. * subtrahend - The number that is to be subtracted. * difference - The location to return the difference of the two values. * difference may the same as one of minuend or subtrahend. * ****************************************************************************/ void usub64(FAR const struct uint64_s *minuend, FAR const struct uint64_s *subtrahend, FAR struct uint64_s *difference); /**************************************************************************** * Name: umul32 * * Description: * Multiply two 32-bit values, factor1 and factor2, and return the * full 64-bit product. * * Input Parameters: * factor1 and factor2 - The values to be multiplied * product - The location to return the product of the two values. * ****************************************************************************/ void umul32(uint32_t factor1, uint32_t factor2, FAR struct uint64_s *product); /**************************************************************************** * Name: umul32x64 * * Description: * Multiply one 32-bit and one 64-bit values, factor1 and factor2, * respectively, and return the truncated 64-bit product. * * Input Parameters: * factor1 and factor2 - The values to be multiplied * product - The location to return the product of the two values. * ****************************************************************************/ void umul32x64(uint32_t factor1, FAR const struct uint64_s *factor2, FAR struct uint64_s *product); /**************************************************************************** * Name: umul64 * * Description: * Multiply two 64-bit values, factor1 and factor2, and return the * truncated 64-bit product. * * Input Parameters: * factor1 and factor2 - The values to be multiplied * product - The location to return the product of the two values. * ****************************************************************************/ void umul64(FAR const struct uint64_s *factor1, FAR const struct uint64_s *factor2, FAR struct uint64_s *product); #undef EXTERN #ifdef __cplusplus } #endif #endif /* __INCLUDE_NUTTX_MATH32_H */