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/******************************************************************************
* Copyright (c) 2013, Texas Instruments Incorporated - http://www.ti.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Texas Instruments Incorporated 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.
*****************************************************************************/
#include "cpu.h"
_CLC_OVERLOAD _CLC_DECL char sub_sat(char x, char y)
{
int bits = CHAR_BIT * sizeof(char);
char min = (char)1 << (char)(bits-1);
char max = min - (char)1;
return ((x^y) >= (char)0 ?
/* different signs: no overflow/underflow */
x-y : x >= (char)0 ?
/* x and y positive: can overflow */
(x > max+y ? max : x-y) :
/* x and y negative: can underflow */
(x < min+y ? min : x-y));
}
_CLC_OVERLOAD _CLC_DECL short sub_sat(short x, short y)
{
int bits = CHAR_BIT * sizeof(short);
short min = (short)1 << (short)(bits-1);
short max = min - (short)1;
return ((x^y) >= (short)0 ?
/* different signs: no overflow/underflow */
x-y : x >= (short)0 ?
/* x and y positive: can overflow */
(x > max+y ? max : x-y) :
/* x and y negative: can underflow */
(x < min+y ? min : x-y));
}
_CLC_OVERLOAD _CLC_DECL int sub_sat(int x, int y)
{
int bits = CHAR_BIT * sizeof(int);
int min = (int)1 << (int)(bits-1);
int max = min - (int)1;
return ((x^y) >= (int)0 ?
/* different signs: no overflow/underflow */
x-y : x >= (int)0 ?
/* x and y positive: can overflow */
(x > max+y ? max : x-y) :
/* x and y negative: can underflow */
(x < min+y ? min : x-y));
}
_CLC_OVERLOAD _CLC_DECL long sub_sat(long x, long y)
{
int bits = CHAR_BIT * sizeof(long);
long min = (long)1 << (long)(bits-1);
long max = min - (long)1;
return ((x^y) >= (long)0 ?
/* different signs: no overflow/underflow */
x-y : x >= (long)0 ?
/* x and y positive: can overflow */
(x > max+y ? max : x-y) :
/* x and y negative: can underflow */
(x < min+y ? min : x-y));
}
_CLC_OVERLOAD _CLC_DECL uchar sub_sat(uchar x, uchar y)
{
uchar min = (uchar)0;
return (x < min+y ? min : x-y);
}
_CLC_OVERLOAD _CLC_DECL ushort sub_sat(ushort x, ushort y)
{
ushort min = (ushort)0;
return (x < min+y ? min : x-y);
}
_CLC_OVERLOAD _CLC_DECL uint sub_sat(uint x, uint y)
{
uint min = (uint)0;
return (x < min+y ? min : x-y);
}
_CLC_OVERLOAD _CLC_DECL ulong sub_sat(ulong x, ulong y)
{
ulong min = (ulong)0;
return (x < min+y ? min : x-y);
}
BINARY_VEC_DEF(char, char, sub_sat, sub_sat)
BINARY_VEC_DEF(uchar, uchar, sub_sat, sub_sat)
BINARY_VEC_DEF(short, short, sub_sat, sub_sat)
BINARY_VEC_DEF(ushort, ushort,sub_sat, sub_sat)
BINARY_VEC_DEF(int, int, sub_sat, sub_sat)
BINARY_VEC_DEF(uint, uint, sub_sat, sub_sat)
BINARY_VEC_DEF(long, long, sub_sat, sub_sat)
BINARY_VEC_DEF(ulong, ulong, sub_sat, sub_sat)
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