#if !defined(_mathops_H) # define _mathops_H (1) # include <ogg/ogg.h> # ifdef __GNUC_PREREQ # if __GNUC_PREREQ(3,4) # include <limits.h> /*Note the casts to (int) below: this prevents OC_CLZ{32|64}_OFFS from "upgrading" the type of an entire expression to an (unsigned) size_t.*/ # if INT_MAX>=2147483647 # define OC_CLZ32_OFFS ((int)sizeof(unsigned)*CHAR_BIT) # define OC_CLZ32(_x) (__builtin_clz(_x)) # elif LONG_MAX>=2147483647L # define OC_CLZ32_OFFS ((int)sizeof(unsigned long)*CHAR_BIT) # define OC_CLZ32(_x) (__builtin_clzl(_x)) # endif # if INT_MAX>=9223372036854775807LL # define OC_CLZ64_OFFS ((int)sizeof(unsigned)*CHAR_BIT) # define OC_CLZ64(_x) (__builtin_clz(_x)) # elif LONG_MAX>=9223372036854775807LL # define OC_CLZ64_OFFS ((int)sizeof(unsigned long)*CHAR_BIT) # define OC_CLZ64(_x) (__builtin_clzl(_x)) # elif LLONG_MAX>=9223372036854775807LL|| \ __LONG_LONG_MAX__>=9223372036854775807LL # define OC_CLZ64_OFFS ((int)sizeof(unsigned long long)*CHAR_BIT) # define OC_CLZ64(_x) (__builtin_clzll(_x)) # endif # endif # endif /** * oc_ilog32 - Integer binary logarithm of a 32-bit value. * @_v: A 32-bit value. * Returns floor(log2(_v))+1, or 0 if _v==0. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. * The OC_ILOG_32() or OC_ILOGNZ_32() macros may be able to use a builtin * function instead, which should be faster. */ int oc_ilog32(ogg_uint32_t _v); /** * oc_ilog64 - Integer binary logarithm of a 64-bit value. * @_v: A 64-bit value. * Returns floor(log2(_v))+1, or 0 if _v==0. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. * The OC_ILOG_64() or OC_ILOGNZ_64() macros may be able to use a builtin * function instead, which should be faster. */ int oc_ilog64(ogg_int64_t _v); # if defined(OC_CLZ32) /** * OC_ILOGNZ_32 - Integer binary logarithm of a non-zero 32-bit value. * @_v: A non-zero 32-bit value. * Returns floor(log2(_v))+1. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. * If _v is zero, the return value is undefined; use OC_ILOG_32() instead. */ # define OC_ILOGNZ_32(_v) (OC_CLZ32_OFFS-OC_CLZ32(_v)) /** * OC_ILOG_32 - Integer binary logarithm of a 32-bit value. * @_v: A 32-bit value. * Returns floor(log2(_v))+1, or 0 if _v==0. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. */ # define OC_ILOG_32(_v) (OC_ILOGNZ_32(_v)&-!!(_v)) # else # define OC_ILOGNZ_32(_v) (oc_ilog32(_v)) # define OC_ILOG_32(_v) (oc_ilog32(_v)) # endif # if defined(CLZ64) /** * OC_ILOGNZ_64 - Integer binary logarithm of a non-zero 64-bit value. * @_v: A non-zero 64-bit value. * Returns floor(log2(_v))+1. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. * If _v is zero, the return value is undefined; use OC_ILOG_64() instead. */ # define OC_ILOGNZ_64(_v) (CLZ64_OFFS-CLZ64(_v)) /** * OC_ILOG_64 - Integer binary logarithm of a 64-bit value. * @_v: A 64-bit value. * Returns floor(log2(_v))+1, or 0 if _v==0. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. */ # define OC_ILOG_64(_v) (OC_ILOGNZ_64(_v)&-!!(_v)) # else # define OC_ILOGNZ_64(_v) (oc_ilog64(_v)) # define OC_ILOG_64(_v) (oc_ilog64(_v)) # endif # define OC_STATIC_ILOG0(_v) (!!(_v)) # define OC_STATIC_ILOG1(_v) (((_v)&0x2)?2:OC_STATIC_ILOG0(_v)) # define OC_STATIC_ILOG2(_v) \ (((_v)&0xC)?2+OC_STATIC_ILOG1((_v)>>2):OC_STATIC_ILOG1(_v)) # define OC_STATIC_ILOG3(_v) \ (((_v)&0xF0)?4+OC_STATIC_ILOG2((_v)>>4):OC_STATIC_ILOG2(_v)) # define OC_STATIC_ILOG4(_v) \ (((_v)&0xFF00)?8+OC_STATIC_ILOG3((_v)>>8):OC_STATIC_ILOG3(_v)) # define OC_STATIC_ILOG5(_v) \ (((_v)&0xFFFF0000)?16+OC_STATIC_ILOG4((_v)>>16):OC_STATIC_ILOG4(_v)) # define OC_STATIC_ILOG6(_v) \ (((_v)&0xFFFFFFFF00000000ULL)?32+OC_STATIC_ILOG5((_v)>>32):OC_STATIC_ILOG5(_v)) /** * OC_STATIC_ILOG_32 - The integer logarithm of an (unsigned, 32-bit) constant. * @_v: A non-negative 32-bit constant. * Returns floor(log2(_v))+1, or 0 if _v==0. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. * This macro is suitable for evaluation at compile time, but it should not be * used on values that can change at runtime, as it operates via exhaustive * search. */ # define OC_STATIC_ILOG_32(_v) (OC_STATIC_ILOG5((ogg_uint32_t)(_v))) /** * OC_STATIC_ILOG_64 - The integer logarithm of an (unsigned, 64-bit) constant. * @_v: A non-negative 64-bit constant. * Returns floor(log2(_v))+1, or 0 if _v==0. * This is the number of bits that would be required to represent _v in two's * complement notation with all of the leading zeros stripped. * This macro is suitable for evaluation at compile time, but it should not be * used on values that can change at runtime, as it operates via exhaustive * search. */ # define OC_STATIC_ILOG_64(_v) (OC_STATIC_ILOG6((ogg_int64_t)(_v))) #define OC_Q57(_v) ((ogg_int64_t)(_v)<<57) ogg_int64_t oc_bexp64(ogg_int64_t _z); ogg_int64_t oc_blog64(ogg_int64_t _w); #endif