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Diffstat (limited to 'src/int_math.h')
| -rw-r--r-- | src/int_math.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/int_math.h b/src/int_math.h new file mode 100644 index 00000000..34ceba64 --- /dev/null +++ b/src/int_math.h @@ -0,0 +1,59 @@ +/* + Copyright 2019-2020 David Robillard <http://drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#ifndef SERD_INTMATH_H +#define SERD_INTMATH_H + +#include <stdint.h> + +static const uint64_t POW10[] = {1ull, + 10ull, + 100ull, + 1000ull, + 10000ull, + 100000ull, + 1000000ull, + 10000000ull, + 100000000ull, + 1000000000ull, + 10000000000ull, + 100000000000ull, + 1000000000000ull, + 10000000000000ull, + 100000000000000ull, + 1000000000000000ull, + 10000000000000000ull, + 100000000000000000ull, + 1000000000000000000ull, + 10000000000000000000ull}; + +/// Return the number of leading zeros in `i` +unsigned +serd_clz32(uint32_t i); + +/// Return the number of leading zeros in `i` +unsigned +serd_clz64(uint64_t i); + +/// Return the log base 2 of `i` +uint64_t +serd_ilog2(uint64_t i); + +/// Return the log base 10 of `i` +uint64_t +serd_ilog10(uint64_t i); + +#endif // SERD_INTMATH_H |