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