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/* vim:ts=8:sts=4:sw=4:noai:noexpandtab
*
* 8-bit and 16-bit shift fixed point math
*
* Copyright (c) 2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#if !defined (__PGM_IMPL_FRAMEWORK_H_INSIDE__) && !defined (PGM_COMPILATION)
# error "Only <framework.h> can be included directly."
#endif
#ifndef __PGM_IMPL_FIXED_H__
#define __PGM_IMPL_FIXED_H__
#include <pgm/types.h>
PGM_BEGIN_DECLS
static inline uint_fast32_t pgm_fp8 (unsigned) PGM_GNUC_CONST;
static inline uint_fast32_t pgm_fp16 (unsigned) PGM_GNUC_CONST;
static inline unsigned pgm_fp8tou (uint_fast32_t) PGM_GNUC_CONST;
static inline unsigned pgm_fp16tou (uint_fast32_t) PGM_GNUC_CONST;
static inline uint_fast32_t pgm_fp8mul (uint_fast32_t, uint_fast32_t) PGM_GNUC_CONST;
static inline uint_fast32_t pgm_fp16mul (uint_fast32_t, uint_fast32_t) PGM_GNUC_CONST;
static inline uint_fast32_t pgm_fp8div (uint_fast32_t, uint_fast32_t) PGM_GNUC_CONST;
static inline uint_fast32_t pgm_fp16div (uint_fast32_t, uint_fast32_t) PGM_GNUC_CONST;
static inline uint_fast32_t pgm_fp16pow (uint_fast32_t, uint_fast32_t) PGM_GNUC_CONST;
static inline
uint_fast32_t
pgm_fp8 (
unsigned v
)
{
return (uint32_t)(v << 8);
}
static inline
uint_fast32_t
pgm_fp16 (
unsigned v
)
{
return (uint_fast32_t)(v << 16);
}
static inline
unsigned
pgm_fp8tou (
uint_fast32_t f
)
{
return (f + (1 << 7)) >> 8;
}
static inline
unsigned
pgm_fp16tou (
uint_fast32_t f
)
{
return (f + (1 << 15)) >> 16;
}
static inline
uint_fast32_t
pgm_fp8mul (
uint_fast32_t a,
uint_fast32_t b
)
{
return ( a * b + 128 ) >> 8;
}
static inline
uint_fast32_t
pgm_fp16mul (
uint_fast32_t a,
uint_fast32_t b
)
{
return ( a * b + 32768 ) >> 16;
}
static inline
uint_fast32_t
pgm_fp8div (
uint_fast32_t a,
uint_fast32_t b
)
{
return ( ( (a << 9) / b ) + 1 ) / 2;
}
static inline
uint_fast32_t
pgm_fp16div (
uint_fast32_t a,
uint_fast32_t b
)
{
return ( ( (a << 17) / b ) + 1 ) / 2;
}
static inline
uint_fast32_t
pgm_fp16pow (
uint_fast32_t x,
uint_fast32_t y
)
{
uint_fast32_t result = pgm_fp16 (1);
#if defined(__STDC_VERSION__) && (__STDC_VERSION >= 199901L)
/* C99 version */
for (uint_fast32_t i = x;
y;
y >>= 1)
{
if (y & 1)
result = (result * i + 32768) >> 16;
i = (i * i + 32768) >> 16;
}
#else
/* C89 version */
{
uint_fast32_t i;
for (i = x;
y;
y >>= 1)
{
if (y & 1)
result = (result * i + 32768) >> 16;
i = (i * i + 32768) >> 16;
}
}
#endif
return result;
}
PGM_END_DECLS
#endif /* __PGM_IMPL_FIXED_H__ */
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