| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkNx_DEFINED |
| #define SkNx_DEFINED |
| |
| |
| //#define SKNX_NO_SIMD |
| |
| #include "SkScalar.h" |
| #include "SkTypes.h" |
| #include <math.h> |
| #define REQUIRE(x) static_assert(x, #x) |
| |
| // This file may be included multiple times by .cpp files with different flags, leading |
| // to different definitions. Usually that doesn't matter because it's all inlined, but |
| // in Debug modes the compilers may not inline everything. So wrap everything in an |
| // anonymous namespace to give each includer their own silo of this code (or the linker |
| // will probably pick one randomly for us, which is rarely correct). |
| namespace { |
| |
| // The default implementations just fall back on a pair of size N/2. |
| // These support the union of operations we might do to ints and floats, but |
| // platform specializations might support fewer (e.g. no float <<, no int /). |
| template <int N, typename T> |
| class SkNx { |
| public: |
| SkNx() {} |
| SkNx(const SkNx<N/2, T>& lo, const SkNx<N/2, T>& hi) : fLo(lo), fHi(hi) {} |
| SkNx(T val) : fLo(val), fHi(val) {} |
| static SkNx Load(const T vals[N]) { |
| return SkNx(SkNx<N/2,T>::Load(vals), SkNx<N/2,T>::Load(vals+N/2)); |
| } |
| |
| SkNx(T a, T b) : fLo(a), fHi(b) { REQUIRE(N==2); } |
| SkNx(T a, T b, T c, T d) : fLo(a,b), fHi(c,d) { REQUIRE(N==4); } |
| SkNx(T a, T b, T c, T d, T e, T f, T g, T h) : fLo(a,b,c,d), fHi(e,f,g,h) { REQUIRE(N==8); } |
| SkNx(T a, T b, T c, T d, T e, T f, T g, T h, |
| T i, T j, T k, T l, T m, T n, T o, T p) |
| : fLo(a,b,c,d, e,f,g,h), fHi(i,j,k,l, m,n,o,p) { REQUIRE(N==16); } |
| |
| void store(T vals[N]) const { |
| fLo.store(vals); |
| fHi.store(vals+N/2); |
| } |
| |
| SkNx saturatedAdd(const SkNx& o) const { |
| return SkNx(fLo.saturatedAdd(o.fLo), fHi.saturatedAdd(o.fHi)); |
| } |
| |
| SkNx operator + (const SkNx& o) const { return SkNx(fLo + o.fLo, fHi + o.fHi); } |
| SkNx operator - (const SkNx& o) const { return SkNx(fLo - o.fLo, fHi - o.fHi); } |
| SkNx operator * (const SkNx& o) const { return SkNx(fLo * o.fLo, fHi * o.fHi); } |
| SkNx operator / (const SkNx& o) const { return SkNx(fLo / o.fLo, fHi / o.fHi); } |
| |
| SkNx operator << (int bits) const { return SkNx(fLo << bits, fHi << bits); } |
| SkNx operator >> (int bits) const { return SkNx(fLo >> bits, fHi >> bits); } |
| |
| SkNx operator == (const SkNx& o) const { return SkNx(fLo == o.fLo, fHi == o.fHi); } |
| SkNx operator != (const SkNx& o) const { return SkNx(fLo != o.fLo, fHi != o.fHi); } |
| SkNx operator < (const SkNx& o) const { return SkNx(fLo < o.fLo, fHi < o.fHi); } |
| SkNx operator > (const SkNx& o) const { return SkNx(fLo > o.fLo, fHi > o.fHi); } |
| SkNx operator <= (const SkNx& o) const { return SkNx(fLo <= o.fLo, fHi <= o.fHi); } |
| SkNx operator >= (const SkNx& o) const { return SkNx(fLo >= o.fLo, fHi >= o.fHi); } |
| |
| static SkNx Min(const SkNx& a, const SkNx& b) { |
| return SkNx(SkNx<N/2, T>::Min(a.fLo, b.fLo), SkNx<N/2, T>::Min(a.fHi, b.fHi)); |
| } |
| static SkNx Max(const SkNx& a, const SkNx& b) { |
| return SkNx(SkNx<N/2, T>::Max(a.fLo, b.fLo), SkNx<N/2, T>::Max(a.fHi, b.fHi)); |
| } |
| |
| SkNx sqrt() const { return SkNx(fLo.sqrt(), fHi.sqrt()); } |
| // Generally, increasing precision, increasing cost. |
| SkNx rsqrt0() const { return SkNx(fLo.rsqrt0(), fHi.rsqrt0()); } |
| SkNx rsqrt1() const { return SkNx(fLo.rsqrt1(), fHi.rsqrt1()); } |
| SkNx rsqrt2() const { return SkNx(fLo.rsqrt2(), fHi.rsqrt2()); } |
| |
| SkNx invert() const { return SkNx(fLo. invert(), fHi. invert()); } |
| SkNx approxInvert() const { return SkNx(fLo.approxInvert(), fHi.approxInvert()); } |
| |
| template <int k> T kth() const { |
| SkASSERT(0 <= k && k < N); |
| return k < N/2 ? fLo.template kth<k>() : fHi.template kth<k-N/2>(); |
| } |
| |
| bool allTrue() const { return fLo.allTrue() && fHi.allTrue(); } |
| bool anyTrue() const { return fLo.anyTrue() || fHi.anyTrue(); } |
| SkNx thenElse(const SkNx& t, const SkNx& e) const { |
| return SkNx(fLo.thenElse(t.fLo, e.fLo), fHi.thenElse(t.fHi, e.fHi)); |
| } |
| |
| protected: |
| REQUIRE(0 == (N & (N-1))); |
| |
| SkNx<N/2, T> fLo, fHi; |
| }; |
| |
| // Bottom out the default implementations with scalars when nothing's been specialized. |
| template <typename T> |
| class SkNx<1,T> { |
| public: |
| SkNx() {} |
| SkNx(T val) : fVal(val) {} |
| static SkNx Load(const T vals[1]) { return SkNx(vals[0]); } |
| |
| void store(T vals[1]) const { vals[0] = fVal; } |
| |
| SkNx saturatedAdd(const SkNx& o) const { |
| SkASSERT((T)(~0) > 0); // TODO: support signed T |
| T sum = fVal + o.fVal; |
| return SkNx(sum < fVal ? (T)(~0) : sum); |
| } |
| |
| SkNx operator + (const SkNx& o) const { return SkNx(fVal + o.fVal); } |
| SkNx operator - (const SkNx& o) const { return SkNx(fVal - o.fVal); } |
| SkNx operator * (const SkNx& o) const { return SkNx(fVal * o.fVal); } |
| SkNx operator / (const SkNx& o) const { return SkNx(fVal / o.fVal); } |
| |
| SkNx operator << (int bits) const { return SkNx(fVal << bits); } |
| SkNx operator >> (int bits) const { return SkNx(fVal >> bits); } |
| |
| SkNx operator == (const SkNx& o) const { return SkNx(fVal == o.fVal); } |
| SkNx operator != (const SkNx& o) const { return SkNx(fVal != o.fVal); } |
| SkNx operator < (const SkNx& o) const { return SkNx(fVal < o.fVal); } |
| SkNx operator > (const SkNx& o) const { return SkNx(fVal > o.fVal); } |
| SkNx operator <= (const SkNx& o) const { return SkNx(fVal <= o.fVal); } |
| SkNx operator >= (const SkNx& o) const { return SkNx(fVal >= o.fVal); } |
| |
| static SkNx Min(const SkNx& a, const SkNx& b) { return SkNx(SkTMin(a.fVal, b.fVal)); } |
| static SkNx Max(const SkNx& a, const SkNx& b) { return SkNx(SkTMax(a.fVal, b.fVal)); } |
| |
| SkNx sqrt () const { return SkNx(Sqrt(fVal)); } |
| SkNx rsqrt0() const { return this->sqrt().invert(); } |
| SkNx rsqrt1() const { return this->rsqrt0(); } |
| SkNx rsqrt2() const { return this->rsqrt1(); } |
| |
| SkNx invert() const { return SkNx(1) / SkNx(fVal); } |
| SkNx approxInvert() const { return this->invert(); } |
| |
| template <int k> T kth() const { |
| SkASSERT(0 == k); |
| return fVal; |
| } |
| |
| bool allTrue() const { return fVal != 0; } |
| bool anyTrue() const { return fVal != 0; } |
| SkNx thenElse(const SkNx& t, const SkNx& e) const { return fVal != 0 ? t : e; } |
| |
| protected: |
| static double Sqrt(double val) { return ::sqrt (val); } |
| static float Sqrt(float val) { return ::sqrtf(val); } |
| |
| T fVal; |
| }; |
| |
| // This default implementation can be specialized by ../opts/SkNx_foo.h |
| // if there's a better platform-specific shuffle strategy. |
| template <typename Nx, int... Ix> |
| inline Nx SkNx_shuffle_impl(const Nx& src) { return Nx( src.template kth<Ix>()... ); } |
| |
| // This generic shuffle can be called with 1 or N indices: |
| // Sk4f f(a,b,c,d); |
| // SkNx_shuffle<3>(f); // ~~~> Sk4f(d,d,d,d) |
| // SkNx_shuffle<2,1,0,3>(f); // ~~~> Sk4f(c,b,a,d) |
| template <int... Ix, typename Nx> |
| inline Nx SkNx_shuffle(const Nx& src) { return SkNx_shuffle_impl<Nx, Ix...>(src); } |
| |
| // A reminder alias that shuffles can be used to duplicate a single index across a vector. |
| template <int Ix, typename Nx> |
| inline Nx SkNx_dup(const Nx& src) { return SkNx_shuffle<Ix>(src); } |
| |
| // This is a poor-man's std::make_index_sequence from C++14. |
| // I'd implement it fully, but it hurts my head. |
| template <int...> struct SkIntSequence {}; |
| template <int N> struct MakeSkIntSequence; |
| template <> struct MakeSkIntSequence< 1> : SkIntSequence<0 >{}; |
| template <> struct MakeSkIntSequence< 2> : SkIntSequence<0,1 >{}; |
| template <> struct MakeSkIntSequence< 4> : SkIntSequence<0,1,2,3 >{}; |
| template <> struct MakeSkIntSequence< 8> : SkIntSequence<0,1,2,3,4,5,6,7 >{}; |
| template <> struct MakeSkIntSequence<16> : SkIntSequence<0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15>{}; |
| |
| // This is the default/fallback implementation for SkNx_cast. Best to specialize SkNx_cast! |
| template <typename D, typename S, int N, int... Ix> |
| SkNx<N,D> SkNx_cast_fallback(const SkNx<N,S>& src, SkIntSequence<Ix...>) { |
| return SkNx<N,D>( (D)src.template kth<Ix>()... ); |
| } |
| |
| // This is a generic cast between two SkNx with the same number of elements N. E.g. |
| // Sk4b bs = ...; // Load 4 bytes. |
| // Sk4f fs = SkNx_cast<float>(bs); // Cast each byte to a float. |
| // Sk4i is = SkNx_cast<int>(fs); // Cast each float to int. |
| // This can be specialized in ../opts/SkNx_foo.h if there's a better platform-specific cast. |
| template <typename D, typename S, int N> |
| SkNx<N,D> SkNx_cast(const SkNx<N,S>& src) { |
| return SkNx_cast_fallback<D,S,N>(src, MakeSkIntSequence<N>()); |
| } |
| |
| } // namespace |
| |
| typedef SkNx<2, float> Sk2f; |
| typedef SkNx<4, float> Sk4f; |
| typedef SkNx<8, float> Sk8f; |
| |
| typedef SkNx<2, double> Sk2d; |
| typedef SkNx<4, double> Sk4d; |
| typedef SkNx<8, double> Sk8d; |
| |
| typedef SkNx<2, SkScalar> Sk2s; |
| typedef SkNx<4, SkScalar> Sk4s; |
| typedef SkNx<8, SkScalar> Sk8s; |
| |
| typedef SkNx< 4, uint16_t> Sk4h; |
| typedef SkNx< 8, uint16_t> Sk8h; |
| typedef SkNx<16, uint16_t> Sk16h; |
| |
| typedef SkNx< 4, uint8_t> Sk4b; |
| typedef SkNx< 8, uint8_t> Sk8b; |
| typedef SkNx<16, uint8_t> Sk16b; |
| |
| typedef SkNx<4, int> Sk4i; |
| |
| // Include platform specific specializations if available. |
| #if !defined(SKNX_NO_SIMD) && SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_AVX |
| #include "../opts/SkNx_avx.h" |
| #elif !defined(SKNX_NO_SIMD) && SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 |
| #include "../opts/SkNx_sse.h" |
| #elif !defined(SKNX_NO_SIMD) && defined(SK_ARM_HAS_NEON) |
| #include "../opts/SkNx_neon.h" |
| #else |
| static inline |
| void Sk4f_ToBytes(uint8_t p[16], const Sk4f& a, const Sk4f& b, const Sk4f& c, const Sk4f& d) { |
| SkNx_cast<uint8_t>(a).store(p+ 0); |
| SkNx_cast<uint8_t>(b).store(p+ 4); |
| SkNx_cast<uint8_t>(c).store(p+ 8); |
| SkNx_cast<uint8_t>(d).store(p+12); |
| } |
| #endif |
| |
| #undef REQUIRE |
| |
| |
| #endif//SkNx_DEFINED |