130 lines
2.4 KiB
C++
130 lines
2.4 KiB
C++
// SPDX-License-Identifier: MIT
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// Copyright 2012, SIL International, All rights reserved.
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#pragma once
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#include <cstddef>
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namespace graphite2
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{
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#if defined GRAPHITE2_BUILTINS && (defined __GNUC__ || defined __clang__)
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template<typename T>
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inline unsigned int bit_set_count(T v)
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{
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return __builtin_popcount(v);
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}
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template<>
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inline unsigned int bit_set_count(int16_t v)
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{
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return __builtin_popcount(static_cast<uint16_t>(v));
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}
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template<>
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inline unsigned int bit_set_count(int8_t v)
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{
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return __builtin_popcount(static_cast<uint8_t>(v));
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}
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template<>
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inline unsigned int bit_set_count(unsigned long v)
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{
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return __builtin_popcountl(v);
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}
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template<>
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inline unsigned int bit_set_count(signed long v)
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{
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return __builtin_popcountl(v);
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}
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template<>
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inline unsigned int bit_set_count(unsigned long long v)
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{
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return __builtin_popcountll(v);
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}
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template<>
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inline unsigned int bit_set_count(signed long long v)
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{
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return __builtin_popcountll(v);
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}
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#else
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template<typename T>
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inline unsigned int bit_set_count(T v)
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{
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static size_t const ONES = ~0;
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v = v - ((v >> 1) & T(ONES/3)); // temp
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v = (v & T(ONES/15*3)) + ((v >> 2) & T(ONES/15*3)); // temp
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v = (v + (v >> 4)) & T(ONES/255*15); // temp
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return (T)(v * T(ONES/255)) >> (sizeof(T)-1)*8; // count
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}
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#endif
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//TODO: Changed these to uintmax_t when we go to C++11
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template<int S>
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inline size_t _mask_over_val(size_t v)
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{
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v = _mask_over_val<S/2>(v);
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v |= v >> S*4;
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return v;
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}
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//TODO: Changed these to uintmax_t when we go to C++11
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template<>
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inline size_t _mask_over_val<1>(size_t v)
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{
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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return v;
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}
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template<typename T>
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inline T mask_over_val(T v)
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{
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return T(_mask_over_val<sizeof(T)>(v));
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}
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template<typename T>
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inline unsigned long next_highest_power2(T v)
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{
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return _mask_over_val<sizeof(T)>(v-1)+1;
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}
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template<typename T>
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inline unsigned int log_binary(T v)
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{
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return bit_set_count(mask_over_val(v))-1;
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}
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template<typename T>
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inline T has_zero(const T x)
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{
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return (x - T(~T(0)/255)) & ~x & T(~T(0)/255*128);
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}
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template<typename T>
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inline T zero_bytes(const T x, unsigned char n)
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{
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const T t = T(~T(0)/255*n);
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return T((has_zero(x^t) >> 7)*n);
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}
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#if 0
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inline float float_round(float x, uint32_t m)
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{
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*reinterpret_cast<unsigned int *>(&x) &= m;
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return *reinterpret_cast<float *>(&x);
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}
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#endif
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}
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