File content as of revision 1:1ce0f4ee7357:

/* FastCRC library code is placed under the MIT license
 * Copyright (c) 2014,2015 Frank Bösing
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

 
// CPU-specific implementations of helper functions

#if !defined(__CORTEX_M4) 
#if !defined(FastCRC_cpu)
#define FastCRC_cpu

//Reverse byte order (16 bit)
#if defined(__thumb__)  
static __attribute__((section(".rev16_text"))) __INLINE __ASM uint32_t REV16(uint32_t value)
{
  rev16 r0, r0
  bx lr
}
#else
static inline __attribute__((always_inline)) 
unsigned int REV16( unsigned int value) //generic
{
    return (value >> 8) | ((value & 0xff) << 8);
}
#endif





//Reverse byte order (32 bit)
#if defined(__thumb__) 
static __attribute__((section(".rev16_text"))) __INLINE __ASM uint32_t REV32(uint32_t value)
{
  rev r0, r0
  bx lr
}
#else
static inline  __attribute__((always_inline))
unsigned int REV32( unsigned int value) //generic
{
    value = (value >> 16) | ((value & 0xffff) << 16);
    return ((value >> 8) & 0xff00ff) | ((value & 0xff00ff) << 8);
}
#endif


#endif
#endif