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Diffstat (limited to '3rdparty/openpgm-svn-r1085/pgm/include/impl/fixed.h')
| -rw-r--r-- | 3rdparty/openpgm-svn-r1085/pgm/include/impl/fixed.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/3rdparty/openpgm-svn-r1085/pgm/include/impl/fixed.h b/3rdparty/openpgm-svn-r1085/pgm/include/impl/fixed.h new file mode 100644 index 0000000..f84ef33 --- /dev/null +++ b/3rdparty/openpgm-svn-r1085/pgm/include/impl/fixed.h @@ -0,0 +1,140 @@ +/* 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); + for (uint_fast32_t i = x; + y; + y >>= 1) + { + if (y & 1) + result = (result * i + 32768) >> 16; + i = (i * i + 32768) >> 16; + } + return result; +} + +PGM_END_DECLS + +#endif /* __PGM_IMPL_FIXED_H__ */ |