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Diffstat (limited to 'src/core/Sk4x_sse.h')
| -rw-r--r-- | src/core/Sk4x_sse.h | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/core/Sk4x_sse.h b/src/core/Sk4x_sse.h new file mode 100644 index 0000000000..6ef1ec8770 --- /dev/null +++ b/src/core/Sk4x_sse.h @@ -0,0 +1,186 @@ +// It is important _not_ to put header guards here. +// This file will be intentionally included three times. + +// Useful reading: +// https://software.intel.com/sites/landingpage/IntrinsicsGuide/ + +#if defined(SK4X_PREAMBLE) + // Code in this file may assume SSE and SSE2. + #include <emmintrin.h> + + // It must check for later instruction sets. + #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41 + #include <immintrin.h> + #endif + + // A little bit of template metaprogramming to map + // float to __m128 and int32_t to __m128i. + template <typename T> struct SkScalarToSIMD; + template <> struct SkScalarToSIMD<float> { typedef __m128 Type; }; + template <> struct SkScalarToSIMD<int32_t> { typedef __m128i Type; }; + + // These are all free. MSVC insists we use _mm_castA_B(a) instead of (B)a. + __m128 as_4f(__m128i v) { return _mm_castsi128_ps(v); } + __m128 as_4f(__m128 v) { return v ; } + __m128i as_4i(__m128i v) { return v ; } + __m128i as_4i(__m128 v) { return _mm_castps_si128(v); } + +#elif defined(SK4X_PRIVATE) + // The best (1 op) way to get all -1s in a register. Our compilers are a little too cautious... + static __m128i True() { + #ifdef __GNUC__ + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wuninitialized" + __m128i uninitialized; + return _mm_cmpeq_epi32(uninitialized, uninitialized); + #pragma GCC diagnostic pop + #else + // Can't figure out how to suppress C4700 from MSVC. Oh well, we'll be a little slower. + __m128i zero = _mm_setzero_si128(); + return _mm_cmpeq_epi32(zero, zero); + #endif + } + + // Leaving these implicit makes the rest of the code below a bit less noisy to read. + Sk4x(__m128i); + Sk4x(__m128); + + Sk4x andNot(const Sk4x&) const; + + typename SkScalarToSIMD<T>::Type fVec; + +#else//Method definitions. + +// Helps to get these in before anything else. +template <> inline Sk4f::Sk4x(__m128i v) : fVec(as_4f(v)) {} +template <> inline Sk4f::Sk4x(__m128 v) : fVec( v ) {} +template <> inline Sk4i::Sk4x(__m128i v) : fVec( v ) {} +template <> inline Sk4i::Sk4x(__m128 v) : fVec(as_4i(v)) {} + +// Next, methods whose implementation is the same for Sk4f and Sk4i. +template <typename T> Sk4x<T>::Sk4x() {} +template <typename T> Sk4x<T>::Sk4x(const Sk4x& other) { *this = other; } +template <typename T> Sk4x<T>& Sk4x<T>::operator=(const Sk4x<T>& other) { + fVec = other.fVec; + return *this; +} + +// We pun in these _mm_shuffle_* methods a little to use the fastest / most available methods. +// They're all bit-preserving operations so it shouldn't matter. + +template <typename T> +Sk4x<T> Sk4x<T>::zwxy() const { return _mm_shuffle_epi32(as_4i(fVec), _MM_SHUFFLE(1,0,3,2)); } + +template <typename T> +Sk4x<T> Sk4x<T>::XYAB(const Sk4x<T>& a, const Sk4x<T>& b) { + return _mm_movelh_ps(as_4f(a.fVec), as_4f(b.fVec)); +} + +template <typename T> +Sk4x<T> Sk4x<T>::ZWCD(const Sk4x<T>& a, const Sk4x<T>& b) { + return _mm_movehl_ps(as_4f(b.fVec), as_4f(a.fVec)); +} + +// Now we'll write all Sk4f specific methods. This M() macro will remove some noise. +#define M(...) template <> inline __VA_ARGS__ Sk4f:: + +M() Sk4x(float a, float b, float c, float d) : fVec(_mm_set_ps(d,c,b,a)) {} + +M(Sk4f) Load (const float fs[4]) { return _mm_loadu_ps(fs); } +M(Sk4f) LoadAligned(const float fs[4]) { return _mm_load_ps (fs); } + +M(void) store (float fs[4]) const { _mm_storeu_ps(fs, fVec); } +M(void) storeAligned(float fs[4]) const { _mm_store_ps (fs, fVec); } + +template <> template <> +Sk4i Sk4f::reinterpret<Sk4i>() const { return as_4i(fVec); } + +template <> template <> +Sk4i Sk4f::cast<Sk4i>() const { return _mm_cvtps_epi32(fVec); } + +// We're going to try a little experiment here and skip allTrue(), anyTrue(), and bit-manipulators +// for Sk4f. Code that calls them probably does so accidentally. +// Ask mtklein to fill these in if you really need them. + +M(Sk4f) add (const Sk4f& o) const { return _mm_add_ps(fVec, o.fVec); } +M(Sk4f) subtract(const Sk4f& o) const { return _mm_sub_ps(fVec, o.fVec); } +M(Sk4f) multiply(const Sk4f& o) const { return _mm_mul_ps(fVec, o.fVec); } +M(Sk4f) divide (const Sk4f& o) const { return _mm_div_ps(fVec, o.fVec); } + +M(Sk4i) equal (const Sk4f& o) const { return _mm_cmpeq_ps (fVec, o.fVec); } +M(Sk4i) notEqual (const Sk4f& o) const { return _mm_cmpneq_ps(fVec, o.fVec); } +M(Sk4i) lessThan (const Sk4f& o) const { return _mm_cmplt_ps (fVec, o.fVec); } +M(Sk4i) greaterThan (const Sk4f& o) const { return _mm_cmpgt_ps (fVec, o.fVec); } +M(Sk4i) lessThanEqual (const Sk4f& o) const { return _mm_cmple_ps (fVec, o.fVec); } +M(Sk4i) greaterThanEqual(const Sk4f& o) const { return _mm_cmpge_ps (fVec, o.fVec); } + +M(Sk4f) Min(const Sk4f& a, const Sk4f& b) { return _mm_min_ps(a.fVec, b.fVec); } +M(Sk4f) Max(const Sk4f& a, const Sk4f& b) { return _mm_max_ps(a.fVec, b.fVec); } + +// Now we'll write all the Sk4i specific methods. Same deal for M(). +#undef M +#define M(...) template <> inline __VA_ARGS__ Sk4i:: + +M() Sk4x(int32_t a, int32_t b, int32_t c, int32_t d) : fVec(_mm_set_epi32(d,c,b,a)) {} + +M(Sk4i) Load (const int32_t is[4]) { return _mm_loadu_si128((const __m128i*)is); } +M(Sk4i) LoadAligned(const int32_t is[4]) { return _mm_load_si128 ((const __m128i*)is); } + +M(void) store (int32_t is[4]) const { _mm_storeu_si128((__m128i*)is, fVec); } +M(void) storeAligned(int32_t is[4]) const { _mm_store_si128 ((__m128i*)is, fVec); } + +template <> template <> +Sk4f Sk4i::reinterpret<Sk4f>() const { return as_4f(fVec); } + +template <> template <> +Sk4f Sk4i::cast<Sk4f>() const { return _mm_cvtepi32_ps(fVec); } + +M(bool) allTrue() const { return 0xf == _mm_movemask_ps(as_4f(fVec)); } +M(bool) anyTrue() const { return 0x0 != _mm_movemask_ps(as_4f(fVec)); } + +M(Sk4i) bitNot() const { return _mm_xor_si128(fVec, True()); } +M(Sk4i) bitAnd(const Sk4i& o) const { return _mm_and_si128(fVec, o.fVec); } +M(Sk4i) bitOr (const Sk4i& o) const { return _mm_or_si128 (fVec, o.fVec); } + +M(Sk4i) equal (const Sk4i& o) const { return _mm_cmpeq_epi32 (fVec, o.fVec); } +M(Sk4i) lessThan (const Sk4i& o) const { return _mm_cmplt_epi32 (fVec, o.fVec); } +M(Sk4i) greaterThan (const Sk4i& o) const { return _mm_cmpgt_epi32 (fVec, o.fVec); } +M(Sk4i) notEqual (const Sk4i& o) const { return this-> equal(o).bitNot(); } +M(Sk4i) lessThanEqual (const Sk4i& o) const { return this->greaterThan(o).bitNot(); } +M(Sk4i) greaterThanEqual(const Sk4i& o) const { return this-> lessThan(o).bitNot(); } + +M(Sk4i) add (const Sk4i& o) const { return _mm_add_epi32(fVec, o.fVec); } +M(Sk4i) subtract(const Sk4i& o) const { return _mm_sub_epi32(fVec, o.fVec); } + +// SSE doesn't have integer division. Let's see how far we can get without Sk4i::divide(). + +// Sk4i's multiply(), Min(), and Max() all improve significantly with SSE4.1. +#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41 + M(Sk4i) multiply(const Sk4i& o) const { return _mm_mullo_epi32(fVec, o.fVec); } + M(Sk4i) Min(const Sk4i& a, const Sk4i& b) { return _mm_min_epi32(a.fVec, b.fVec); } + M(Sk4i) Max(const Sk4i& a, const Sk4i& b) { return _mm_max_epi32(a.fVec, b.fVec); } +#else + M(Sk4i) multiply(const Sk4i& o) const { + // First 2 32->64 bit multiplies. + __m128i mul02 = _mm_mul_epu32(fVec, o.fVec), + mul13 = _mm_mul_epu32(_mm_srli_si128(fVec, 4), _mm_srli_si128(o.fVec, 4)); + // Now recombine the high bits of the two products. + return _mm_unpacklo_epi32(_mm_shuffle_epi32(mul02, _MM_SHUFFLE(0,0,2,0)), + _mm_shuffle_epi32(mul13, _MM_SHUFFLE(0,0,2,0))); + } + + M(Sk4i) andNot(const Sk4i& o) const { return _mm_andnot_si128(o.fVec, fVec); } + + M(Sk4i) Min(const Sk4i& a, const Sk4i& b) { + Sk4i less = a.lessThan(b); + return a.bitAnd(less).bitOr(b.andNot(less)); + } + M(Sk4i) Max(const Sk4i& a, const Sk4i& b) { + Sk4i less = a.lessThan(b); + return b.bitAnd(less).bitOr(a.andNot(less)); + } +#endif + +#undef M + +#endif//Method definitions. |