| /* |
| * Copyright © 2017 Google, Inc. |
| * Copyright © 2019 Facebook, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Google Author(s): Behdad Esfahbod |
| * Facebook Author(s): Behdad Esfahbod |
| */ |
| |
| #ifndef HB_ALGS_HH |
| #define HB_ALGS_HH |
| |
| #include "hb.hh" |
| #include "hb-meta.hh" |
| #include "hb-null.hh" |
| #include "hb-number.hh" |
| |
| #include <algorithm> |
| #include <initializer_list> |
| |
| /* |
| * Flags |
| */ |
| |
| /* Enable bitwise ops on enums marked as flags_t */ |
| /* To my surprise, looks like the function resolver is happy to silently cast |
| * one enum to another... So this doesn't provide the type-checking that I |
| * originally had in mind... :(. |
| * |
| * For MSVC warnings, see: https://github.com/harfbuzz/harfbuzz/pull/163 |
| */ |
| #ifdef _MSC_VER |
| # pragma warning(disable:4200) |
| # pragma warning(disable:4800) |
| #endif |
| #define HB_MARK_AS_FLAG_T(T) \ |
| extern "C++" { \ |
| static inline constexpr T operator | (T l, T r) { return T ((unsigned) l | (unsigned) r); } \ |
| static inline constexpr T operator & (T l, T r) { return T ((unsigned) l & (unsigned) r); } \ |
| static inline constexpr T operator ^ (T l, T r) { return T ((unsigned) l ^ (unsigned) r); } \ |
| static inline constexpr T operator ~ (T r) { return T (~(unsigned int) r); } \ |
| static inline T& operator |= (T &l, T r) { l = l | r; return l; } \ |
| static inline T& operator &= (T& l, T r) { l = l & r; return l; } \ |
| static inline T& operator ^= (T& l, T r) { l = l ^ r; return l; } \ |
| } \ |
| static_assert (true, "") |
| |
| /* Useful for set-operations on small enums. |
| * For example, for testing "x ∈ {x1, x2, x3}" use: |
| * (FLAG_UNSAFE(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3))) |
| */ |
| #define FLAG(x) (static_assert_expr ((unsigned)(x) < 32) + (((uint32_t) 1U) << (unsigned)(x))) |
| #define FLAG_UNSAFE(x) ((unsigned)(x) < 32 ? (((uint32_t) 1U) << (unsigned)(x)) : 0) |
| #define FLAG_RANGE(x,y) (static_assert_expr ((x) < (y)) + FLAG(y+1) - FLAG(x)) |
| #define FLAG64(x) (static_assert_expr ((unsigned)(x) < 64) + (((uint64_t) 1ULL) << (unsigned)(x))) |
| #define FLAG64_UNSAFE(x) ((unsigned)(x) < 64 ? (((uint64_t) 1ULL) << (unsigned)(x)) : 0) |
| |
| |
| /* |
| * Big-endian integers. |
| */ |
| |
| /* Endian swap, used in Windows related backends */ |
| static inline constexpr uint16_t hb_uint16_swap (uint16_t v) |
| { return (v >> 8) | (v << 8); } |
| static inline constexpr uint32_t hb_uint32_swap (uint32_t v) |
| { return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); } |
| |
| template <typename Type, int Bytes = sizeof (Type)> |
| struct BEInt; |
| template <typename Type> |
| struct BEInt<Type, 1> |
| { |
| public: |
| BEInt () = default; |
| constexpr BEInt (Type V) : v {uint8_t (V)} {} |
| constexpr operator Type () const { return v; } |
| private: uint8_t v; |
| }; |
| template <typename Type> |
| struct BEInt<Type, 2> |
| { |
| public: |
| BEInt () = default; |
| constexpr BEInt (Type V) : v {uint8_t ((V >> 8) & 0xFF), |
| uint8_t ((V ) & 0xFF)} {} |
| |
| struct __attribute__((packed)) packed_uint16_t { uint16_t v; }; |
| constexpr operator Type () const |
| { |
| #if ((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__)) && \ |
| defined(__BYTE_ORDER) && \ |
| (__BYTE_ORDER == __LITTLE_ENDIAN || __BYTE_ORDER == __BIG_ENDIAN) |
| /* Spoon-feed the compiler a big-endian integer with alignment 1. |
| * https://github.com/harfbuzz/harfbuzz/pull/1398 */ |
| #if __BYTE_ORDER == __LITTLE_ENDIAN |
| return __builtin_bswap16 (((packed_uint16_t *) this)->v); |
| #else /* __BYTE_ORDER == __BIG_ENDIAN */ |
| return ((packed_uint16_t *) this)->v; |
| #endif |
| #else |
| return (v[0] << 8) |
| + (v[1] ); |
| #endif |
| } |
| private: uint8_t v[2]; |
| }; |
| template <typename Type> |
| struct BEInt<Type, 3> |
| { |
| static_assert (!hb_is_signed (Type), ""); |
| public: |
| BEInt () = default; |
| constexpr BEInt (Type V) : v {uint8_t ((V >> 16) & 0xFF), |
| uint8_t ((V >> 8) & 0xFF), |
| uint8_t ((V ) & 0xFF)} {} |
| |
| constexpr operator Type () const { return (v[0] << 16) |
| + (v[1] << 8) |
| + (v[2] ); } |
| private: uint8_t v[3]; |
| }; |
| template <typename Type> |
| struct BEInt<Type, 4> |
| { |
| public: |
| BEInt () = default; |
| constexpr BEInt (Type V) : v {uint8_t ((V >> 24) & 0xFF), |
| uint8_t ((V >> 16) & 0xFF), |
| uint8_t ((V >> 8) & 0xFF), |
| uint8_t ((V ) & 0xFF)} {} |
| constexpr operator Type () const { return (v[0] << 24) |
| + (v[1] << 16) |
| + (v[2] << 8) |
| + (v[3] ); } |
| private: uint8_t v[4]; |
| }; |
| |
| /* Floats. */ |
| |
| /* We want our rounding towards +infinity. */ |
| static inline float |
| _hb_roundf (float x) { return floorf (x + .5f); } |
| #define roundf(x) _hb_roundf(x) |
| |
| |
| /* Encodes three unsigned integers in one 64-bit number. If the inputs have more than 21 bits, |
| * values will be truncated / overlap, and might not decode exactly. */ |
| #define HB_CODEPOINT_ENCODE3(x,y,z) (((uint64_t) (x) << 42) | ((uint64_t) (y) << 21) | (uint64_t) (z)) |
| #define HB_CODEPOINT_DECODE3_1(v) ((hb_codepoint_t) ((v) >> 42)) |
| #define HB_CODEPOINT_DECODE3_2(v) ((hb_codepoint_t) ((v) >> 21) & 0x1FFFFFu) |
| #define HB_CODEPOINT_DECODE3_3(v) ((hb_codepoint_t) (v) & 0x1FFFFFu) |
| |
| /* Custom encoding used by hb-ucd. */ |
| #define HB_CODEPOINT_ENCODE3_11_7_14(x,y,z) (((uint32_t) ((x) & 0x07FFu) << 21) | (((uint32_t) (y) & 0x007Fu) << 14) | (uint32_t) ((z) & 0x3FFFu)) |
| #define HB_CODEPOINT_DECODE3_11_7_14_1(v) ((hb_codepoint_t) ((v) >> 21)) |
| #define HB_CODEPOINT_DECODE3_11_7_14_2(v) ((hb_codepoint_t) (((v) >> 14) & 0x007Fu) | 0x0300) |
| #define HB_CODEPOINT_DECODE3_11_7_14_3(v) ((hb_codepoint_t) (v) & 0x3FFFu) |
| |
| |
| struct |
| { |
| /* Note. This is dangerous in that if it's passed an rvalue, it returns rvalue-reference. */ |
| template <typename T> constexpr auto |
| operator () (T&& v) const HB_AUTO_RETURN ( hb_forward<T> (v) ) |
| } |
| HB_FUNCOBJ (hb_identity); |
| struct |
| { |
| /* Like identity(), but only retains lvalue-references. Rvalues are returned as rvalues. */ |
| template <typename T> constexpr T& |
| operator () (T& v) const { return v; } |
| |
| template <typename T> constexpr hb_remove_reference<T> |
| operator () (T&& v) const { return v; } |
| } |
| HB_FUNCOBJ (hb_lidentity); |
| struct |
| { |
| /* Like identity(), but always returns rvalue. */ |
| template <typename T> constexpr hb_remove_reference<T> |
| operator () (T&& v) const { return v; } |
| } |
| HB_FUNCOBJ (hb_ridentity); |
| |
| struct |
| { |
| template <typename T> constexpr bool |
| operator () (T&& v) const { return bool (hb_forward<T> (v)); } |
| } |
| HB_FUNCOBJ (hb_bool); |
| |
| struct |
| { |
| private: |
| |
| template <typename T> constexpr auto |
| impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, hb_deref (v).hash ()) |
| |
| template <typename T, |
| hb_enable_if (hb_is_integral (T))> constexpr auto |
| impl (const T& v, hb_priority<0>) const HB_AUTO_RETURN |
| ( |
| /* Knuth's multiplicative method: */ |
| (uint32_t) v * 2654435761u |
| ) |
| |
| public: |
| |
| template <typename T> constexpr auto |
| operator () (const T& v) const HB_RETURN (uint32_t, impl (v, hb_prioritize)) |
| } |
| HB_FUNCOBJ (hb_hash); |
| |
| |
| struct |
| { |
| private: |
| |
| /* Pointer-to-member-function. */ |
| template <typename Appl, typename T, typename ...Ts> auto |
| impl (Appl&& a, hb_priority<2>, T &&v, Ts&&... ds) const HB_AUTO_RETURN |
| ((hb_deref (hb_forward<T> (v)).*hb_forward<Appl> (a)) (hb_forward<Ts> (ds)...)) |
| |
| /* Pointer-to-member. */ |
| template <typename Appl, typename T> auto |
| impl (Appl&& a, hb_priority<1>, T &&v) const HB_AUTO_RETURN |
| ((hb_deref (hb_forward<T> (v))).*hb_forward<Appl> (a)) |
| |
| /* Operator(). */ |
| template <typename Appl, typename ...Ts> auto |
| impl (Appl&& a, hb_priority<0>, Ts&&... ds) const HB_AUTO_RETURN |
| (hb_deref (hb_forward<Appl> (a)) (hb_forward<Ts> (ds)...)) |
| |
| public: |
| |
| template <typename Appl, typename ...Ts> auto |
| operator () (Appl&& a, Ts&&... ds) const HB_AUTO_RETURN |
| ( |
| impl (hb_forward<Appl> (a), |
| hb_prioritize, |
| hb_forward<Ts> (ds)...) |
| ) |
| } |
| HB_FUNCOBJ (hb_invoke); |
| |
| template <unsigned Pos, typename Appl, typename V> |
| struct hb_partial_t |
| { |
| hb_partial_t (Appl a, V v) : a (a), v (v) {} |
| |
| static_assert (Pos > 0, ""); |
| |
| template <typename ...Ts, |
| unsigned P = Pos, |
| hb_enable_if (P == 1)> auto |
| operator () (Ts&& ...ds) -> decltype (hb_invoke (hb_declval (Appl), |
| hb_declval (V), |
| hb_declval (Ts)...)) |
| { |
| return hb_invoke (hb_forward<Appl> (a), |
| hb_forward<V> (v), |
| hb_forward<Ts> (ds)...); |
| } |
| template <typename T0, typename ...Ts, |
| unsigned P = Pos, |
| hb_enable_if (P == 2)> auto |
| operator () (T0&& d0, Ts&& ...ds) -> decltype (hb_invoke (hb_declval (Appl), |
| hb_declval (T0), |
| hb_declval (V), |
| hb_declval (Ts)...)) |
| { |
| return hb_invoke (hb_forward<Appl> (a), |
| hb_forward<T0> (d0), |
| hb_forward<V> (v), |
| hb_forward<Ts> (ds)...); |
| } |
| |
| private: |
| hb_reference_wrapper<Appl> a; |
| V v; |
| }; |
| template <unsigned Pos=1, typename Appl, typename V> |
| auto hb_partial (Appl&& a, V&& v) HB_AUTO_RETURN |
| (( hb_partial_t<Pos, Appl, V> (a, v) )) |
| |
| /* The following, HB_PARTIALIZE, macro uses a particular corner-case |
| * of C++11 that is not particularly well-supported by all compilers. |
| * What's happening is that it's using "this" in a trailing return-type |
| * via decltype(). Broken compilers deduce the type of "this" pointer |
| * in that context differently from what it resolves to in the body |
| * of the function. |
| * |
| * One probable cause of this is that at the time of trailing return |
| * type declaration, "this" points to an incomplete type, whereas in |
| * the function body the type is complete. That doesn't justify the |
| * error in any way, but is probably what's happening. |
| * |
| * In the case of MSVC, we get around this by using C++14 "decltype(auto)" |
| * which deduces the type from the actual return statement. For gcc 4.8 |
| * we use "+this" instead of "this" which produces an rvalue that seems |
| * to be deduced as the same type with this particular compiler, and seem |
| * to be fine as default code path as well. |
| */ |
| #ifdef _MSC_VER |
| /* https://github.com/harfbuzz/harfbuzz/issues/1730 */ \ |
| #define HB_PARTIALIZE(Pos) \ |
| template <typename _T> \ |
| decltype(auto) operator () (_T&& _v) const \ |
| { return hb_partial<Pos> (this, hb_forward<_T> (_v)); } \ |
| static_assert (true, "") |
| #else |
| /* https://github.com/harfbuzz/harfbuzz/issues/1724 */ |
| #define HB_PARTIALIZE(Pos) \ |
| template <typename _T> \ |
| auto operator () (_T&& _v) const HB_AUTO_RETURN \ |
| (hb_partial<Pos> (+this, hb_forward<_T> (_v))) \ |
| static_assert (true, "") |
| #endif |
| |
| |
| struct |
| { |
| private: |
| |
| template <typename Pred, typename Val> auto |
| impl (Pred&& p, Val &&v, hb_priority<1>) const HB_AUTO_RETURN |
| ( |
| hb_deref (hb_forward<Pred> (p)).has (hb_forward<Val> (v)) |
| ) |
| |
| template <typename Pred, typename Val> auto |
| impl (Pred&& p, Val &&v, hb_priority<0>) const HB_AUTO_RETURN |
| ( |
| hb_invoke (hb_forward<Pred> (p), |
| hb_forward<Val> (v)) |
| ) |
| |
| public: |
| |
| template <typename Pred, typename Val> auto |
| operator () (Pred&& p, Val &&v) const HB_RETURN (bool, |
| impl (hb_forward<Pred> (p), |
| hb_forward<Val> (v), |
| hb_prioritize) |
| ) |
| } |
| HB_FUNCOBJ (hb_has); |
| |
| struct |
| { |
| private: |
| |
| template <typename Pred, typename Val> auto |
| impl (Pred&& p, Val &&v, hb_priority<1>) const HB_AUTO_RETURN |
| ( |
| hb_has (hb_forward<Pred> (p), |
| hb_forward<Val> (v)) |
| ) |
| |
| template <typename Pred, typename Val> auto |
| impl (Pred&& p, Val &&v, hb_priority<0>) const HB_AUTO_RETURN |
| ( |
| hb_forward<Pred> (p) == hb_forward<Val> (v) |
| ) |
| |
| public: |
| |
| template <typename Pred, typename Val> auto |
| operator () (Pred&& p, Val &&v) const HB_RETURN (bool, |
| impl (hb_forward<Pred> (p), |
| hb_forward<Val> (v), |
| hb_prioritize) |
| ) |
| } |
| HB_FUNCOBJ (hb_match); |
| |
| struct |
| { |
| private: |
| |
| template <typename Proj, typename Val> auto |
| impl (Proj&& f, Val &&v, hb_priority<2>) const HB_AUTO_RETURN |
| ( |
| hb_deref (hb_forward<Proj> (f)).get (hb_forward<Val> (v)) |
| ) |
| |
| template <typename Proj, typename Val> auto |
| impl (Proj&& f, Val &&v, hb_priority<1>) const HB_AUTO_RETURN |
| ( |
| hb_invoke (hb_forward<Proj> (f), |
| hb_forward<Val> (v)) |
| ) |
| |
| template <typename Proj, typename Val> auto |
| impl (Proj&& f, Val &&v, hb_priority<0>) const HB_AUTO_RETURN |
| ( |
| hb_forward<Proj> (f)[hb_forward<Val> (v)] |
| ) |
| |
| public: |
| |
| template <typename Proj, typename Val> auto |
| operator () (Proj&& f, Val &&v) const HB_AUTO_RETURN |
| ( |
| impl (hb_forward<Proj> (f), |
| hb_forward<Val> (v), |
| hb_prioritize) |
| ) |
| } |
| HB_FUNCOBJ (hb_get); |
| |
| struct |
| { |
| private: |
| |
| template <typename T1, typename T2> auto |
| impl (T1&& v1, T2 &&v2, hb_priority<2>) const HB_AUTO_RETURN |
| ( |
| hb_forward<T2> (v2).cmp (hb_forward<T1> (v1)) == 0 |
| ) |
| |
| template <typename T1, typename T2> auto |
| impl (T1&& v1, T2 &&v2, hb_priority<1>) const HB_AUTO_RETURN |
| ( |
| hb_forward<T1> (v1).cmp (hb_forward<T2> (v2)) == 0 |
| ) |
| |
| template <typename T1, typename T2> auto |
| impl (T1&& v1, T2 &&v2, hb_priority<0>) const HB_AUTO_RETURN |
| ( |
| hb_forward<T1> (v1) == hb_forward<T2> (v2) |
| ) |
| |
| public: |
| |
| template <typename T1, typename T2> auto |
| operator () (T1&& v1, T2 &&v2) const HB_AUTO_RETURN |
| ( |
| impl (hb_forward<T1> (v1), |
| hb_forward<T2> (v2), |
| hb_prioritize) |
| ) |
| } |
| HB_FUNCOBJ (hb_equal); |
| |
| |
| template <typename T1, typename T2> |
| struct hb_pair_t |
| { |
| typedef T1 first_t; |
| typedef T2 second_t; |
| typedef hb_pair_t<T1, T2> pair_t; |
| |
| hb_pair_t (T1 a, T2 b) : first (a), second (b) {} |
| |
| template <typename Q1, typename Q2, |
| hb_enable_if (hb_is_convertible (T1, Q1) && |
| hb_is_convertible (T2, T2))> |
| operator hb_pair_t<Q1, Q2> () { return hb_pair_t<Q1, Q2> (first, second); } |
| |
| hb_pair_t<T1, T2> reverse () const |
| { return hb_pair_t<T1, T2> (second, first); } |
| |
| bool operator == (const pair_t& o) const { return first == o.first && second == o.second; } |
| bool operator != (const pair_t& o) const { return !(*this == o); } |
| bool operator < (const pair_t& o) const { return first < o.first || (first == o.first && second < o.second); } |
| bool operator >= (const pair_t& o) const { return !(*this < o); } |
| bool operator > (const pair_t& o) const { return first > o.first || (first == o.first && second > o.second); } |
| bool operator <= (const pair_t& o) const { return !(*this > o); } |
| |
| T1 first; |
| T2 second; |
| }; |
| #define hb_pair_t(T1,T2) hb_pair_t<T1, T2> |
| template <typename T1, typename T2> static inline hb_pair_t<T1, T2> |
| hb_pair (T1&& a, T2&& b) { return hb_pair_t<T1, T2> (a, b); } |
| |
| struct |
| { |
| template <typename Pair> constexpr typename Pair::first_t |
| operator () (const Pair& pair) const { return pair.first; } |
| } |
| HB_FUNCOBJ (hb_first); |
| |
| struct |
| { |
| template <typename Pair> constexpr typename Pair::second_t |
| operator () (const Pair& pair) const { return pair.second; } |
| } |
| HB_FUNCOBJ (hb_second); |
| |
| /* Note. In min/max impl, we can use hb_type_identity<T> for second argument. |
| * However, that would silently convert between different-signedness integers. |
| * Instead we accept two different types, such that compiler can err if |
| * comparing integers of different signedness. */ |
| struct |
| { |
| template <typename T, typename T2> constexpr auto |
| operator () (T&& a, T2&& b) const HB_AUTO_RETURN |
| (a <= b ? hb_forward<T> (a) : hb_forward<T2> (b)) |
| } |
| HB_FUNCOBJ (hb_min); |
| struct |
| { |
| template <typename T, typename T2> constexpr auto |
| operator () (T&& a, T2&& b) const HB_AUTO_RETURN |
| (a >= b ? hb_forward<T> (a) : hb_forward<T2> (b)) |
| } |
| HB_FUNCOBJ (hb_max); |
| struct |
| { |
| template <typename T, typename T2, typename T3> constexpr auto |
| operator () (T&& x, T2&& min, T3&& max) const HB_AUTO_RETURN |
| (hb_min (hb_max (hb_forward<T> (x), hb_forward<T2> (min)), hb_forward<T3> (max))) |
| } |
| HB_FUNCOBJ (hb_clamp); |
| |
| struct |
| { |
| template <typename T> void |
| operator () (T& a, T& b) const |
| { |
| using std::swap; // allow ADL |
| swap (a, b); |
| } |
| } |
| HB_FUNCOBJ (hb_swap); |
| |
| /* |
| * Bithacks. |
| */ |
| |
| /* Return the number of 1 bits in v. */ |
| template <typename T> |
| static inline unsigned int |
| hb_popcount (T v) |
| { |
| #if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) |
| if (sizeof (T) <= sizeof (unsigned int)) |
| return __builtin_popcount (v); |
| |
| if (sizeof (T) <= sizeof (unsigned long)) |
| return __builtin_popcountl (v); |
| |
| if (sizeof (T) <= sizeof (unsigned long long)) |
| return __builtin_popcountll (v); |
| #endif |
| |
| if (sizeof (T) <= 4) |
| { |
| /* "HACKMEM 169" */ |
| uint32_t y; |
| y = (v >> 1) &033333333333; |
| y = v - y - ((y >>1) & 033333333333); |
| return (((y + (y >> 3)) & 030707070707) % 077); |
| } |
| |
| if (sizeof (T) == 8) |
| { |
| unsigned int shift = 32; |
| return hb_popcount<uint32_t> ((uint32_t) v) + hb_popcount ((uint32_t) (v >> shift)); |
| } |
| |
| if (sizeof (T) == 16) |
| { |
| unsigned int shift = 64; |
| return hb_popcount<uint64_t> ((uint64_t) v) + hb_popcount ((uint64_t) (v >> shift)); |
| } |
| |
| assert (0); |
| return 0; /* Shut up stupid compiler. */ |
| } |
| |
| /* Returns the number of bits needed to store number */ |
| template <typename T> |
| static inline unsigned int |
| hb_bit_storage (T v) |
| { |
| if (unlikely (!v)) return 0; |
| |
| #if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) |
| if (sizeof (T) <= sizeof (unsigned int)) |
| return sizeof (unsigned int) * 8 - __builtin_clz (v); |
| |
| if (sizeof (T) <= sizeof (unsigned long)) |
| return sizeof (unsigned long) * 8 - __builtin_clzl (v); |
| |
| if (sizeof (T) <= sizeof (unsigned long long)) |
| return sizeof (unsigned long long) * 8 - __builtin_clzll (v); |
| #endif |
| |
| #if (defined(_MSC_VER) && _MSC_VER >= 1500) || (defined(__MINGW32__) && (__GNUC__ < 4)) |
| if (sizeof (T) <= sizeof (unsigned int)) |
| { |
| unsigned long where; |
| _BitScanReverse (&where, v); |
| return 1 + where; |
| } |
| # if defined(_WIN64) |
| if (sizeof (T) <= 8) |
| { |
| unsigned long where; |
| _BitScanReverse64 (&where, v); |
| return 1 + where; |
| } |
| # endif |
| #endif |
| |
| if (sizeof (T) <= 4) |
| { |
| /* "bithacks" */ |
| const unsigned int b[] = {0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000}; |
| const unsigned int S[] = {1, 2, 4, 8, 16}; |
| unsigned int r = 0; |
| for (int i = 4; i >= 0; i--) |
| if (v & b[i]) |
| { |
| v >>= S[i]; |
| r |= S[i]; |
| } |
| return r + 1; |
| } |
| if (sizeof (T) <= 8) |
| { |
| /* "bithacks" */ |
| const uint64_t b[] = {0x2ULL, 0xCULL, 0xF0ULL, 0xFF00ULL, 0xFFFF0000ULL, 0xFFFFFFFF00000000ULL}; |
| const unsigned int S[] = {1, 2, 4, 8, 16, 32}; |
| unsigned int r = 0; |
| for (int i = 5; i >= 0; i--) |
| if (v & b[i]) |
| { |
| v >>= S[i]; |
| r |= S[i]; |
| } |
| return r + 1; |
| } |
| if (sizeof (T) == 16) |
| { |
| unsigned int shift = 64; |
| return (v >> shift) ? hb_bit_storage<uint64_t> ((uint64_t) (v >> shift)) + shift : |
| hb_bit_storage<uint64_t> ((uint64_t) v); |
| } |
| |
| assert (0); |
| return 0; /* Shut up stupid compiler. */ |
| } |
| |
| /* Returns the number of zero bits in the least significant side of v */ |
| template <typename T> |
| static inline unsigned int |
| hb_ctz (T v) |
| { |
| if (unlikely (!v)) return 8 * sizeof (T); |
| |
| #if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) |
| if (sizeof (T) <= sizeof (unsigned int)) |
| return __builtin_ctz (v); |
| |
| if (sizeof (T) <= sizeof (unsigned long)) |
| return __builtin_ctzl (v); |
| |
| if (sizeof (T) <= sizeof (unsigned long long)) |
| return __builtin_ctzll (v); |
| #endif |
| |
| #if (defined(_MSC_VER) && _MSC_VER >= 1500) || (defined(__MINGW32__) && (__GNUC__ < 4)) |
| if (sizeof (T) <= sizeof (unsigned int)) |
| { |
| unsigned long where; |
| _BitScanForward (&where, v); |
| return where; |
| } |
| # if defined(_WIN64) |
| if (sizeof (T) <= 8) |
| { |
| unsigned long where; |
| _BitScanForward64 (&where, v); |
| return where; |
| } |
| # endif |
| #endif |
| |
| if (sizeof (T) <= 4) |
| { |
| /* "bithacks" */ |
| unsigned int c = 32; |
| v &= - (int32_t) v; |
| if (v) c--; |
| if (v & 0x0000FFFF) c -= 16; |
| if (v & 0x00FF00FF) c -= 8; |
| if (v & 0x0F0F0F0F) c -= 4; |
| if (v & 0x33333333) c -= 2; |
| if (v & 0x55555555) c -= 1; |
| return c; |
| } |
| if (sizeof (T) <= 8) |
| { |
| /* "bithacks" */ |
| unsigned int c = 64; |
| v &= - (int64_t) (v); |
| if (v) c--; |
| if (v & 0x00000000FFFFFFFFULL) c -= 32; |
| if (v & 0x0000FFFF0000FFFFULL) c -= 16; |
| if (v & 0x00FF00FF00FF00FFULL) c -= 8; |
| if (v & 0x0F0F0F0F0F0F0F0FULL) c -= 4; |
| if (v & 0x3333333333333333ULL) c -= 2; |
| if (v & 0x5555555555555555ULL) c -= 1; |
| return c; |
| } |
| if (sizeof (T) == 16) |
| { |
| unsigned int shift = 64; |
| return (uint64_t) v ? hb_bit_storage<uint64_t> ((uint64_t) v) : |
| hb_bit_storage<uint64_t> ((uint64_t) (v >> shift)) + shift; |
| } |
| |
| assert (0); |
| return 0; /* Shut up stupid compiler. */ |
| } |
| |
| |
| /* |
| * Tiny stuff. |
| */ |
| |
| /* ASCII tag/character handling */ |
| static inline bool ISALPHA (unsigned char c) |
| { return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); } |
| static inline bool ISALNUM (unsigned char c) |
| { return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'); } |
| static inline bool ISSPACE (unsigned char c) |
| { return c == ' ' || c =='\f'|| c =='\n'|| c =='\r'|| c =='\t'|| c =='\v'; } |
| static inline unsigned char TOUPPER (unsigned char c) |
| { return (c >= 'a' && c <= 'z') ? c - 'a' + 'A' : c; } |
| static inline unsigned char TOLOWER (unsigned char c) |
| { return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c; } |
| static inline bool ISHEX (unsigned char c) |
| { return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); } |
| static inline unsigned char TOHEX (uint8_t c) |
| { return (c & 0xF) <= 9 ? (c & 0xF) + '0' : (c & 0xF) + 'a' - 10; } |
| static inline uint8_t FROMHEX (unsigned char c) |
| { return (c >= '0' && c <= '9') ? c - '0' : TOLOWER (c) - 'a' + 10; } |
| |
| static inline unsigned int DIV_CEIL (const unsigned int a, unsigned int b) |
| { return (a + (b - 1)) / b; } |
| |
| |
| #undef ARRAY_LENGTH |
| template <typename Type, unsigned int n> |
| static inline unsigned int ARRAY_LENGTH (const Type (&)[n]) { return n; } |
| /* A const version, but does not detect erratically being called on pointers. */ |
| #define ARRAY_LENGTH_CONST(__array) ((signed int) (sizeof (__array) / sizeof (__array[0]))) |
| |
| |
| static inline void * |
| hb_memcpy (void *__restrict dst, const void *__restrict src, size_t len) |
| { |
| /* It's illegal to pass 0 as size to memcpy. */ |
| if (unlikely (!len)) return dst; |
| return memcpy (dst, src, len); |
| } |
| |
| static inline int |
| hb_memcmp (const void *a, const void *b, unsigned int len) |
| { |
| /* It's illegal to pass NULL to memcmp(), even if len is zero. |
| * So, wrap it. |
| * https://sourceware.org/bugzilla/show_bug.cgi?id=23878 */ |
| if (unlikely (!len)) return 0; |
| return memcmp (a, b, len); |
| } |
| |
| static inline void * |
| hb_memset (void *s, int c, unsigned int n) |
| { |
| /* It's illegal to pass NULL to memset(), even if n is zero. */ |
| if (unlikely (!n)) return 0; |
| return memset (s, c, n); |
| } |
| |
| static inline unsigned int |
| hb_ceil_to_4 (unsigned int v) |
| { |
| return ((v - 1) | 3) + 1; |
| } |
| |
| template <typename T> static inline bool |
| hb_in_range (T u, T lo, T hi) |
| { |
| static_assert (!hb_is_signed<T>::value, ""); |
| |
| /* The casts below are important as if T is smaller than int, |
| * the subtract results will become a signed int! */ |
| return (T)(u - lo) <= (T)(hi - lo); |
| } |
| template <typename T> static inline bool |
| hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2) |
| { |
| return hb_in_range (u, lo1, hi1) || hb_in_range (u, lo2, hi2); |
| } |
| template <typename T> static inline bool |
| hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2, T lo3, T hi3) |
| { |
| return hb_in_range (u, lo1, hi1) || hb_in_range (u, lo2, hi2) || hb_in_range (u, lo3, hi3); |
| } |
| |
| |
| /* |
| * Overflow checking. |
| */ |
| |
| /* Consider __builtin_mul_overflow use here also */ |
| static inline bool |
| hb_unsigned_mul_overflows (unsigned int count, unsigned int size) |
| { |
| return (size > 0) && (count >= ((unsigned int) -1) / size); |
| } |
| |
| |
| /* |
| * Sort and search. |
| */ |
| |
| template <typename K, typename V, typename ...Ts> |
| static int |
| _hb_cmp_method (const void *pkey, const void *pval, Ts... ds) |
| { |
| const K& key = * (const K*) pkey; |
| const V& val = * (const V*) pval; |
| |
| return val.cmp (key, ds...); |
| } |
| |
| template <typename V, typename K, typename ...Ts> |
| static inline bool |
| hb_bsearch_impl (unsigned *pos, /* Out */ |
| const K& key, |
| V* base, size_t nmemb, size_t stride, |
| int (*compar)(const void *_key, const void *_item, Ts... _ds), |
| Ts... ds) |
| { |
| /* This is our *only* bsearch implementation. */ |
| |
| int min = 0, max = (int) nmemb - 1; |
| while (min <= max) |
| { |
| int mid = ((unsigned int) min + (unsigned int) max) / 2; |
| #pragma GCC diagnostic push |
| #pragma GCC diagnostic ignored "-Wcast-align" |
| V* p = (V*) (((const char *) base) + (mid * stride)); |
| #pragma GCC diagnostic pop |
| int c = compar ((const void *) hb_addressof (key), (const void *) p, ds...); |
| if (c < 0) |
| max = mid - 1; |
| else if (c > 0) |
| min = mid + 1; |
| else |
| { |
| *pos = mid; |
| return true; |
| } |
| } |
| *pos = min; |
| return false; |
| } |
| |
| template <typename V, typename K> |
| static inline V* |
| hb_bsearch (const K& key, V* base, |
| size_t nmemb, size_t stride = sizeof (V), |
| int (*compar)(const void *_key, const void *_item) = _hb_cmp_method<K, V>) |
| { |
| unsigned pos; |
| #pragma GCC diagnostic push |
| #pragma GCC diagnostic ignored "-Wcast-align" |
| return hb_bsearch_impl (&pos, key, base, nmemb, stride, compar) ? |
| (V*) (((const char *) base) + (pos * stride)) : nullptr; |
| #pragma GCC diagnostic pop |
| } |
| template <typename V, typename K, typename ...Ts> |
| static inline V* |
| hb_bsearch (const K& key, V* base, |
| size_t nmemb, size_t stride, |
| int (*compar)(const void *_key, const void *_item, Ts... _ds), |
| Ts... ds) |
| { |
| unsigned pos; |
| #pragma GCC diagnostic push |
| #pragma GCC diagnostic ignored "-Wcast-align" |
| return hb_bsearch_impl (&pos, key, base, nmemb, stride, compar, ds...) ? |
| (V*) (((const char *) base) + (pos * stride)) : nullptr; |
| #pragma GCC diagnostic pop |
| } |
| |
| |
| /* From https://github.com/noporpoise/sort_r |
| Feb 5, 2019 (c8c65c1e) |
| Modified to support optional argument using templates */ |
| |
| /* Isaac Turner 29 April 2014 Public Domain */ |
| |
| /* |
| hb_qsort function to be exported. |
| Parameters: |
| base is the array to be sorted |
| nel is the number of elements in the array |
| width is the size in bytes of each element of the array |
| compar is the comparison function |
| arg (optional) is a pointer to be passed to the comparison function |
| |
| void hb_qsort(void *base, size_t nel, size_t width, |
| int (*compar)(const void *_a, const void *_b, [void *_arg]), |
| [void *arg]); |
| */ |
| |
| #define SORT_R_SWAP(a,b,tmp) ((tmp) = (a), (a) = (b), (b) = (tmp)) |
| |
| /* swap a and b */ |
| /* a and b must not be equal! */ |
| static inline void sort_r_swap(char *__restrict a, char *__restrict b, |
| size_t w) |
| { |
| char tmp, *end = a+w; |
| for(; a < end; a++, b++) { SORT_R_SWAP(*a, *b, tmp); } |
| } |
| |
| /* swap a, b iff a>b */ |
| /* a and b must not be equal! */ |
| /* __restrict is same as restrict but better support on old machines */ |
| template <typename ...Ts> |
| static inline int sort_r_cmpswap(char *__restrict a, |
| char *__restrict b, size_t w, |
| int (*compar)(const void *_a, |
| const void *_b, |
| Ts... _ds), |
| Ts... ds) |
| { |
| if(compar(a, b, ds...) > 0) { |
| sort_r_swap(a, b, w); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| Swap consecutive blocks of bytes of size na and nb starting at memory addr ptr, |
| with the smallest swap so that the blocks are in the opposite order. Blocks may |
| be internally re-ordered e.g. |
| 12345ab -> ab34512 |
| 123abc -> abc123 |
| 12abcde -> deabc12 |
| */ |
| static inline void sort_r_swap_blocks(char *ptr, size_t na, size_t nb) |
| { |
| if(na > 0 && nb > 0) { |
| if(na > nb) { sort_r_swap(ptr, ptr+na, nb); } |
| else { sort_r_swap(ptr, ptr+nb, na); } |
| } |
| } |
| |
| /* Implement recursive quicksort ourselves */ |
| /* Note: quicksort is not stable, equivalent values may be swapped */ |
| template <typename ...Ts> |
| static inline void sort_r_simple(void *base, size_t nel, size_t w, |
| int (*compar)(const void *_a, |
| const void *_b, |
| Ts... _ds), |
| Ts... ds) |
| { |
| char *b = (char *)base, *end = b + nel*w; |
| |
| /* for(size_t i=0; i<nel; i++) {printf("%4i", *(int*)(b + i*sizeof(int)));} |
| printf("\n"); */ |
| |
| if(nel < 10) { |
| /* Insertion sort for arbitrarily small inputs */ |
| char *pi, *pj; |
| for(pi = b+w; pi < end; pi += w) { |
| for(pj = pi; pj > b && sort_r_cmpswap(pj-w,pj,w,compar,ds...); pj -= w) {} |
| } |
| } |
| else |
| { |
| /* nel > 9; Quicksort */ |
| |
| int cmp; |
| char *pl, *ple, *pr, *pre, *pivot; |
| char *last = b+w*(nel-1), *tmp; |
| |
| /* |
| Use median of second, middle and second-last items as pivot. |
| First and last may have been swapped with pivot and therefore be extreme |
| */ |
| char *l[3]; |
| l[0] = b + w; |
| l[1] = b+w*(nel/2); |
| l[2] = last - w; |
| |
| /* printf("pivots: %i, %i, %i\n", *(int*)l[0], *(int*)l[1], *(int*)l[2]); */ |
| |
| if(compar(l[0],l[1],ds...) > 0) { SORT_R_SWAP(l[0], l[1], tmp); } |
| if(compar(l[1],l[2],ds...) > 0) { |
| SORT_R_SWAP(l[1], l[2], tmp); |
| if(compar(l[0],l[1],ds...) > 0) { SORT_R_SWAP(l[0], l[1], tmp); } |
| } |
| |
| /* swap mid value (l[1]), and last element to put pivot as last element */ |
| if(l[1] != last) { sort_r_swap(l[1], last, w); } |
| |
| /* |
| pl is the next item on the left to be compared to the pivot |
| pr is the last item on the right that was compared to the pivot |
| ple is the left position to put the next item that equals the pivot |
| ple is the last right position where we put an item that equals the pivot |
| v- end (beyond the array) |
| EEEEEELLLLLLLLuuuuuuuuGGGGGGGEEEEEEEE. |
| ^- b ^- ple ^- pl ^- pr ^- pre ^- last (where the pivot is) |
| Pivot comparison key: |
| E = equal, L = less than, u = unknown, G = greater than, E = equal |
| */ |
| pivot = last; |
| ple = pl = b; |
| pre = pr = last; |
| |
| /* |
| Strategy: |
| Loop into the list from the left and right at the same time to find: |
| - an item on the left that is greater than the pivot |
| - an item on the right that is less than the pivot |
| Once found, they are swapped and the loop continues. |
| Meanwhile items that are equal to the pivot are moved to the edges of the |
| array. |
| */ |
| while(pl < pr) { |
| /* Move left hand items which are equal to the pivot to the far left. |
| break when we find an item that is greater than the pivot */ |
| for(; pl < pr; pl += w) { |
| cmp = compar(pl, pivot, ds...); |
| if(cmp > 0) { break; } |
| else if(cmp == 0) { |
| if(ple < pl) { sort_r_swap(ple, pl, w); } |
| ple += w; |
| } |
| } |
| /* break if last batch of left hand items were equal to pivot */ |
| if(pl >= pr) { break; } |
| /* Move right hand items which are equal to the pivot to the far right. |
| break when we find an item that is less than the pivot */ |
| for(; pl < pr; ) { |
| pr -= w; /* Move right pointer onto an unprocessed item */ |
| cmp = compar(pr, pivot, ds...); |
| if(cmp == 0) { |
| pre -= w; |
| if(pr < pre) { sort_r_swap(pr, pre, w); } |
| } |
| else if(cmp < 0) { |
| if(pl < pr) { sort_r_swap(pl, pr, w); } |
| pl += w; |
| break; |
| } |
| } |
| } |
| |
| pl = pr; /* pr may have gone below pl */ |
| |
| /* |
| Now we need to go from: EEELLLGGGGEEEE |
| to: LLLEEEEEEEGGGG |
| Pivot comparison key: |
| E = equal, L = less than, u = unknown, G = greater than, E = equal |
| */ |
| sort_r_swap_blocks(b, ple-b, pl-ple); |
| sort_r_swap_blocks(pr, pre-pr, end-pre); |
| |
| /*for(size_t i=0; i<nel; i++) {printf("%4i", *(int*)(b + i*sizeof(int)));} |
| printf("\n");*/ |
| |
| sort_r_simple(b, (pl-ple)/w, w, compar, ds...); |
| sort_r_simple(end-(pre-pr), (pre-pr)/w, w, compar, ds...); |
| } |
| } |
| |
| static inline void |
| hb_qsort (void *base, size_t nel, size_t width, |
| int (*compar)(const void *_a, const void *_b)) |
| { |
| #if defined(__OPTIMIZE_SIZE__) && !defined(HB_USE_INTERNAL_QSORT) |
| qsort (base, nel, width, compar); |
| #else |
| sort_r_simple (base, nel, width, compar); |
| #endif |
| } |
| |
| static inline void |
| hb_qsort (void *base, size_t nel, size_t width, |
| int (*compar)(const void *_a, const void *_b, void *_arg), |
| void *arg) |
| { |
| #ifdef HAVE_GNU_QSORT_R |
| qsort_r (base, nel, width, compar, arg); |
| #else |
| sort_r_simple (base, nel, width, compar, arg); |
| #endif |
| } |
| |
| |
| template <typename T, typename T2, typename T3> static inline void |
| hb_stable_sort (T *array, unsigned int len, int(*compar)(const T2 *, const T2 *), T3 *array2) |
| { |
| for (unsigned int i = 1; i < len; i++) |
| { |
| unsigned int j = i; |
| while (j && compar (&array[j - 1], &array[i]) > 0) |
| j--; |
| if (i == j) |
| continue; |
| /* Move item i to occupy place for item j, shift what's in between. */ |
| { |
| T t = array[i]; |
| memmove (&array[j + 1], &array[j], (i - j) * sizeof (T)); |
| array[j] = t; |
| } |
| if (array2) |
| { |
| T3 t = array2[i]; |
| memmove (&array2[j + 1], &array2[j], (i - j) * sizeof (T3)); |
| array2[j] = t; |
| } |
| } |
| } |
| |
| template <typename T> static inline void |
| hb_stable_sort (T *array, unsigned int len, int(*compar)(const T *, const T *)) |
| { |
| hb_stable_sort (array, len, compar, (int *) nullptr); |
| } |
| |
| static inline hb_bool_t |
| hb_codepoint_parse (const char *s, unsigned int len, int base, hb_codepoint_t *out) |
| { |
| unsigned int v; |
| const char *p = s; |
| const char *end = p + len; |
| if (unlikely (!hb_parse_uint (&p, end, &v, true/* whole buffer */, base))) |
| return false; |
| |
| *out = v; |
| return true; |
| } |
| |
| |
| /* Operators. */ |
| |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (a & b) |
| } |
| HB_FUNCOBJ (hb_bitwise_and); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (a | b) |
| } |
| HB_FUNCOBJ (hb_bitwise_or); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (a ^ b) |
| } |
| HB_FUNCOBJ (hb_bitwise_xor); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (~a & b) |
| } |
| HB_FUNCOBJ (hb_bitwise_lt); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (a & ~b) |
| } |
| HB_FUNCOBJ (hb_bitwise_gt); // aka sub |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (~a | b) |
| } |
| HB_FUNCOBJ (hb_bitwise_le); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T> constexpr auto |
| operator () (const T &a, const T &b) const HB_AUTO_RETURN (a | ~b) |
| } |
| HB_FUNCOBJ (hb_bitwise_ge); |
| struct |
| { |
| template <typename T> constexpr auto |
| operator () (const T &a) const HB_AUTO_RETURN (~a) |
| } |
| HB_FUNCOBJ (hb_bitwise_neg); |
| |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T, typename T2> constexpr auto |
| operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a + b) |
| } |
| HB_FUNCOBJ (hb_add); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T, typename T2> constexpr auto |
| operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a - b) |
| } |
| HB_FUNCOBJ (hb_sub); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T, typename T2> constexpr auto |
| operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (b - a) |
| } |
| HB_FUNCOBJ (hb_rsub); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T, typename T2> constexpr auto |
| operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a * b) |
| } |
| HB_FUNCOBJ (hb_mul); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T, typename T2> constexpr auto |
| operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a / b) |
| } |
| HB_FUNCOBJ (hb_div); |
| struct |
| { HB_PARTIALIZE(2); |
| template <typename T, typename T2> constexpr auto |
| operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a % b) |
| } |
| HB_FUNCOBJ (hb_mod); |
| struct |
| { |
| template <typename T> constexpr auto |
| operator () (const T &a) const HB_AUTO_RETURN (+a) |
| } |
| HB_FUNCOBJ (hb_pos); |
| struct |
| { |
| template <typename T> constexpr auto |
| operator () (const T &a) const HB_AUTO_RETURN (-a) |
| } |
| HB_FUNCOBJ (hb_neg); |
| struct |
| { |
| template <typename T> constexpr auto |
| operator () (T &a) const HB_AUTO_RETURN (++a) |
| } |
| HB_FUNCOBJ (hb_inc); |
| struct |
| { |
| template <typename T> constexpr auto |
| operator () (T &a) const HB_AUTO_RETURN (--a) |
| } |
| HB_FUNCOBJ (hb_dec); |
| |
| |
| /* Compiler-assisted vectorization. */ |
| |
| /* Type behaving similar to vectorized vars defined using __attribute__((vector_size(...))), |
| * basically a fixed-size bitset. */ |
| template <typename elt_t, unsigned int byte_size> |
| struct hb_vector_size_t |
| { |
| elt_t& operator [] (unsigned int i) { return v[i]; } |
| const elt_t& operator [] (unsigned int i) const { return v[i]; } |
| |
| void clear (unsigned char v = 0) { memset (this, v, sizeof (*this)); } |
| |
| template <typename Op> |
| hb_vector_size_t process (const Op& op) const |
| { |
| hb_vector_size_t r; |
| for (unsigned int i = 0; i < ARRAY_LENGTH (v); i++) |
| r.v[i] = op (v[i]); |
| return r; |
| } |
| template <typename Op> |
| hb_vector_size_t process (const Op& op, const hb_vector_size_t &o) const |
| { |
| hb_vector_size_t r; |
| for (unsigned int i = 0; i < ARRAY_LENGTH (v); i++) |
| r.v[i] = op (v[i], o.v[i]); |
| return r; |
| } |
| hb_vector_size_t operator | (const hb_vector_size_t &o) const |
| { return process (hb_bitwise_or, o); } |
| hb_vector_size_t operator & (const hb_vector_size_t &o) const |
| { return process (hb_bitwise_and, o); } |
| hb_vector_size_t operator ^ (const hb_vector_size_t &o) const |
| { return process (hb_bitwise_xor, o); } |
| hb_vector_size_t operator ~ () const |
| { return process (hb_bitwise_neg); } |
| |
| private: |
| static_assert (0 == byte_size % sizeof (elt_t), ""); |
| elt_t v[byte_size / sizeof (elt_t)]; |
| }; |
| |
| |
| #endif /* HB_ALGS_HH */ |