src/opts/SkNx_sse.h - platform/external/skia - Git at Google

 /*
  * 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_sse_DEFINED
 #define SkNx_sse_DEFINED

 // This file may assume <= SSE2, but must check SK_CPU_SSE_LEVEL for anything more recent.
 // If you do, make sure this is in a static inline function... anywhere else risks violating ODR.

 #define SKNX_IS_FAST

 // SSE 4.1 has _mm_floor_ps to floor 4 floats.  We emulate it:
 //   - roundtrip through integers via truncation
 //   - subtract 1 if that's too big (possible for negative values).
 // This restricts the domain of our inputs to a maximum somehwere around 2^31.  Seems plenty big.
 static inline __m128 sse2_mm_floor_ps(__m128 v) {
     __m128 roundtrip = _mm_cvtepi32_ps(_mm_cvttps_epi32(v));
     __m128 too_big = _mm_cmpgt_ps(roundtrip, v);
     return _mm_sub_ps(roundtrip, _mm_and_ps(too_big, _mm_set1_ps(1.0f)));
 }

 template <>
 class SkNx<2, float> {
 public:
     SkNx(const __m128& vec) : fVec(vec) {}

     SkNx() {}
     SkNx(float val) : fVec(_mm_set1_ps(val)) {}
     static SkNx Load(const void* ptr) {
         return _mm_castsi128_ps(_mm_loadl_epi64((const __m128i*)ptr));
     }
     SkNx(float a, float b) : fVec(_mm_setr_ps(a,b,0,0)) {}

     void store(void* ptr) const { _mm_storel_pi((__m64*)ptr, fVec); }

     SkNx operator + (const SkNx& o) const { return _mm_add_ps(fVec, o.fVec); }
     SkNx operator - (const SkNx& o) const { return _mm_sub_ps(fVec, o.fVec); }
     SkNx operator * (const SkNx& o) const { return _mm_mul_ps(fVec, o.fVec); }
     SkNx operator / (const SkNx& o) const { return _mm_div_ps(fVec, o.fVec); }

     SkNx operator == (const SkNx& o) const { return _mm_cmpeq_ps (fVec, o.fVec); }
     SkNx operator != (const SkNx& o) const { return _mm_cmpneq_ps(fVec, o.fVec); }
     SkNx operator  < (const SkNx& o) const { return _mm_cmplt_ps (fVec, o.fVec); }
     SkNx operator  > (const SkNx& o) const { return _mm_cmpgt_ps (fVec, o.fVec); }
     SkNx operator <= (const SkNx& o) const { return _mm_cmple_ps (fVec, o.fVec); }
     SkNx operator >= (const SkNx& o) const { return _mm_cmpge_ps (fVec, o.fVec); }

     static SkNx Min(const SkNx& l, const SkNx& r) { return _mm_min_ps(l.fVec, r.fVec); }
     static SkNx Max(const SkNx& l, const SkNx& r) { return _mm_max_ps(l.fVec, r.fVec); }

     SkNx  sqrt () const { return _mm_sqrt_ps (fVec);  }
     SkNx rsqrt0() const { return _mm_rsqrt_ps(fVec); }
     SkNx rsqrt1() const { return this->rsqrt0(); }
     SkNx rsqrt2() const { return this->rsqrt1(); }

     SkNx       invert() const { return SkNx(1) / *this; }
     SkNx approxInvert() const { return _mm_rcp_ps(fVec); }

     float operator[](int k) const {
         SkASSERT(0 <= k && k < 2);
         union { __m128 v; float fs[4]; } pun = {fVec};
         return pun.fs[k&1];
     }

     bool allTrue() const { return 0xff == (_mm_movemask_epi8(_mm_castps_si128(fVec)) & 0xff); }
     bool anyTrue() const { return 0x00 != (_mm_movemask_epi8(_mm_castps_si128(fVec)) & 0xff); }

     __m128 fVec;
 };

 template <>
 class SkNx<4, float> {
 public:
     SkNx(const __m128& vec) : fVec(vec) {}

     SkNx() {}
     SkNx(float val)           : fVec( _mm_set1_ps(val) ) {}
     static SkNx Load(const void* ptr) { return _mm_loadu_ps((const float*)ptr); }

     SkNx(float a, float b, float c, float d) : fVec(_mm_setr_ps(a,b,c,d)) {}

     void store(void* ptr) const { _mm_storeu_ps((float*)ptr, fVec); }

     SkNx operator + (const SkNx& o) const { return _mm_add_ps(fVec, o.fVec); }
     SkNx operator - (const SkNx& o) const { return _mm_sub_ps(fVec, o.fVec); }
     SkNx operator * (const SkNx& o) const { return _mm_mul_ps(fVec, o.fVec); }
     SkNx operator / (const SkNx& o) const { return _mm_div_ps(fVec, o.fVec); }

     SkNx operator == (const SkNx& o) const { return _mm_cmpeq_ps (fVec, o.fVec); }
     SkNx operator != (const SkNx& o) const { return _mm_cmpneq_ps(fVec, o.fVec); }
     SkNx operator  < (const SkNx& o) const { return _mm_cmplt_ps (fVec, o.fVec); }
     SkNx operator  > (const SkNx& o) const { return _mm_cmpgt_ps (fVec, o.fVec); }
     SkNx operator <= (const SkNx& o) const { return _mm_cmple_ps (fVec, o.fVec); }
     SkNx operator >= (const SkNx& o) const { return _mm_cmpge_ps (fVec, o.fVec); }

     static SkNx Min(const SkNx& l, const SkNx& r) { return _mm_min_ps(l.fVec, r.fVec); }
     static SkNx Max(const SkNx& l, const SkNx& r) { return _mm_max_ps(l.fVec, r.fVec); }

     SkNx abs() const { return _mm_andnot_ps(_mm_set1_ps(-0.0f), fVec); }
     SkNx floor() const { return sse2_mm_floor_ps(fVec); }

     SkNx  sqrt () const { return _mm_sqrt_ps (fVec);  }
     SkNx rsqrt0() const { return _mm_rsqrt_ps(fVec); }
     SkNx rsqrt1() const { return this->rsqrt0(); }
     SkNx rsqrt2() const { return this->rsqrt1(); }

     SkNx       invert() const { return SkNx(1) / *this; }
     SkNx approxInvert() const { return _mm_rcp_ps(fVec); }

     float operator[](int k) const {
         SkASSERT(0 <= k && k < 4);
         union { __m128 v; float fs[4]; } pun = {fVec};
         return pun.fs[k&3];
     }

     bool allTrue() const { return 0xffff == _mm_movemask_epi8(_mm_castps_si128(fVec)); }
     bool anyTrue() const { return 0x0000 != _mm_movemask_epi8(_mm_castps_si128(fVec)); }

     SkNx thenElse(const SkNx& t, const SkNx& e) const {
         return _mm_or_ps(_mm_and_ps   (fVec, t.fVec),
                          _mm_andnot_ps(fVec, e.fVec));
     }

     __m128 fVec;
 };

 template <>
 class SkNx<4, int> {
 public:
     SkNx(const __m128i& vec) : fVec(vec) {}

     SkNx() {}
     SkNx(int val) : fVec(_mm_set1_epi32(val)) {}
     static SkNx Load(const void* ptr) { return _mm_loadu_si128((const __m128i*)ptr); }
     SkNx(int a, int b, int c, int d) : fVec(_mm_setr_epi32(a,b,c,d)) {}

     void store(void* ptr) const { _mm_storeu_si128((__m128i*)ptr, fVec); }

     SkNx operator + (const SkNx& o) const { return _mm_add_epi32(fVec, o.fVec); }
     SkNx operator - (const SkNx& o) const { return _mm_sub_epi32(fVec, o.fVec); }
     SkNx operator * (const SkNx& o) const {
         __m128i mul20 = _mm_mul_epu32(fVec, o.fVec),
                 mul31 = _mm_mul_epu32(_mm_srli_si128(fVec, 4), _mm_srli_si128(o.fVec, 4));
         return _mm_unpacklo_epi32(_mm_shuffle_epi32(mul20, _MM_SHUFFLE(0,0,2,0)),
                                   _mm_shuffle_epi32(mul31, _MM_SHUFFLE(0,0,2,0)));
     }

     SkNx operator << (int bits) const { return _mm_slli_epi32(fVec, bits); }
     SkNx operator >> (int bits) const { return _mm_srai_epi32(fVec, bits); }

     int operator[](int k) const {
         SkASSERT(0 <= k && k < 4);
         union { __m128i v; int is[4]; } pun = {fVec};
         return pun.is[k&3];
     }

     __m128i fVec;
 };

 template <>
 class SkNx<4, uint16_t> {
 public:
     SkNx(const __m128i& vec) : fVec(vec) {}

     SkNx() {}
     SkNx(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
     static SkNx Load(const void* ptr) { return _mm_loadl_epi64((const __m128i*)ptr); }
     SkNx(uint16_t a, uint16_t b, uint16_t c, uint16_t d) : fVec(_mm_setr_epi16(a,b,c,d,0,0,0,0)) {}

     void store(void* ptr) const { _mm_storel_epi64((__m128i*)ptr, fVec); }

     SkNx operator + (const SkNx& o) const { return _mm_add_epi16(fVec, o.fVec); }
     SkNx operator - (const SkNx& o) const { return _mm_sub_epi16(fVec, o.fVec); }
     SkNx operator * (const SkNx& o) const { return _mm_mullo_epi16(fVec, o.fVec); }

     SkNx operator << (int bits) const { return _mm_slli_epi16(fVec, bits); }
     SkNx operator >> (int bits) const { return _mm_srli_epi16(fVec, bits); }

     uint16_t operator[](int k) const {
         SkASSERT(0 <= k && k < 4);
         union { __m128i v; uint16_t us[8]; } pun = {fVec};
         return pun.us[k&3];
     }

     __m128i fVec;
 };

 template <>
 class SkNx<8, uint16_t> {
 public:
     SkNx(const __m128i& vec) : fVec(vec) {}

     SkNx() {}
     SkNx(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
     static SkNx Load(const void* ptr) { return _mm_loadu_si128((const __m128i*)ptr); }
     SkNx(uint16_t a, uint16_t b, uint16_t c, uint16_t d,
          uint16_t e, uint16_t f, uint16_t g, uint16_t h) : fVec(_mm_setr_epi16(a,b,c,d,e,f,g,h)) {}

     void store(void* ptr) const { _mm_storeu_si128((__m128i*)ptr, fVec); }

     SkNx operator + (const SkNx& o) const { return _mm_add_epi16(fVec, o.fVec); }
     SkNx operator - (const SkNx& o) const { return _mm_sub_epi16(fVec, o.fVec); }
     SkNx operator * (const SkNx& o) const { return _mm_mullo_epi16(fVec, o.fVec); }

     SkNx operator << (int bits) const { return _mm_slli_epi16(fVec, bits); }
     SkNx operator >> (int bits) const { return _mm_srli_epi16(fVec, bits); }

     static SkNx Min(const SkNx& a, const SkNx& b) {
         // No unsigned _mm_min_epu16, so we'll shift into a space where we can use the
         // signed version, _mm_min_epi16, then shift back.
         const uint16_t top = 0x8000; // Keep this separate from _mm_set1_epi16 or MSVC will whine.
         const __m128i top_8x = _mm_set1_epi16(top);
         return _mm_add_epi8(top_8x, _mm_min_epi16(_mm_sub_epi8(a.fVec, top_8x),
                                                   _mm_sub_epi8(b.fVec, top_8x)));
     }

     SkNx thenElse(const SkNx& t, const SkNx& e) const {
         return _mm_or_si128(_mm_and_si128   (fVec, t.fVec),
                             _mm_andnot_si128(fVec, e.fVec));
     }

     uint16_t operator[](int k) const {
         SkASSERT(0 <= k && k < 8);
         union { __m128i v; uint16_t us[8]; } pun = {fVec};
         return pun.us[k&7];
     }

     __m128i fVec;
 };

 template <>
 class SkNx<4, uint8_t> {
 public:
     SkNx(const __m128i& vec) : fVec(vec) {}

     SkNx() {}
     static SkNx Load(const void* ptr) { return _mm_cvtsi32_si128(*(const int*)ptr); }
     void store(void* ptr) const { *(int*)ptr = _mm_cvtsi128_si32(fVec); }

     // TODO as needed

     __m128i fVec;
 };

 template <>
 class SkNx<16, uint8_t> {
 public:
     SkNx(const __m128i& vec) : fVec(vec) {}

     SkNx() {}
     SkNx(uint8_t val) : fVec(_mm_set1_epi8(val)) {}
     static SkNx Load(const void* ptr) { return _mm_loadu_si128((const __m128i*)ptr); }
     SkNx(uint8_t a, uint8_t b, uint8_t c, uint8_t d,
          uint8_t e, uint8_t f, uint8_t g, uint8_t h,
          uint8_t i, uint8_t j, uint8_t k, uint8_t l,
          uint8_t m, uint8_t n, uint8_t o, uint8_t p)
         : fVec(_mm_setr_epi8(a,b,c,d, e,f,g,h, i,j,k,l, m,n,o,p)) {}

     void store(void* ptr) const { _mm_storeu_si128((__m128i*)ptr, fVec); }

     SkNx saturatedAdd(const SkNx& o) const { return _mm_adds_epu8(fVec, o.fVec); }

     SkNx operator + (const SkNx& o) const { return _mm_add_epi8(fVec, o.fVec); }
     SkNx operator - (const SkNx& o) const { return _mm_sub_epi8(fVec, o.fVec); }

     static SkNx Min(const SkNx& a, const SkNx& b) { return _mm_min_epu8(a.fVec, b.fVec); }
     SkNx operator < (const SkNx& o) const {
         // There's no unsigned _mm_cmplt_epu8, so we flip the sign bits then use a signed compare.
         auto flip = _mm_set1_epi8(char(0x80));
         return _mm_cmplt_epi8(_mm_xor_si128(flip, fVec), _mm_xor_si128(flip, o.fVec));
     }

     uint8_t operator[](int k) const {
         SkASSERT(0 <= k && k < 16);
         union { __m128i v; uint8_t us[16]; } pun = {fVec};
         return pun.us[k&15];
     }

     SkNx thenElse(const SkNx& t, const SkNx& e) const {
         return _mm_or_si128(_mm_and_si128   (fVec, t.fVec),
                             _mm_andnot_si128(fVec, e.fVec));
     }

     __m128i fVec;
 };

 template<> /*static*/ inline Sk4f SkNx_cast<float, int>(const Sk4i& src) {
     return _mm_cvtepi32_ps(src.fVec);
 }

 template <> /*static*/ inline Sk4i SkNx_cast<int, float>(const Sk4f& src) {
     return _mm_cvttps_epi32(src.fVec);
 }

 template<> /*static*/ inline Sk4h SkNx_cast<uint16_t, float>(const Sk4f& src) {
     auto _32 = _mm_cvttps_epi32(src.fVec);
     // Ideally we'd use _mm_packus_epi32 here.  But that's SSE4.1+.
 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
     // With SSSE3, we can just shuffle the low 2 bytes from each lane right into place.
     const int _ = ~0;
     return _mm_shuffle_epi8(_32, _mm_setr_epi8(0,1, 4,5, 8,9, 12,13, _,_,_,_,_,_,_,_));
 #else
     // With SSE2, we have to emulate _mm_packus_epi32 with _mm_packs_epi32:
     _32 = _mm_sub_epi32(_32, _mm_set1_epi32((int)0x00008000));
     return _mm_add_epi16(_mm_packs_epi32(_32, _32), _mm_set1_epi16((short)0x8000));
 #endif
 }

 template<> /*static*/ inline Sk4b SkNx_cast<uint8_t, float>(const Sk4f& src) {
     auto _32 = _mm_cvttps_epi32(src.fVec);
 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
     const int _ = ~0;
     return _mm_shuffle_epi8(_32, _mm_setr_epi8(0,4,8,12, _,_,_,_, _,_,_,_, _,_,_,_));
 #else
     auto _16 = _mm_packus_epi16(_32, _32);
     return     _mm_packus_epi16(_16, _16);
 #endif
 }

 template<> /*static*/ inline Sk4f SkNx_cast<float, uint8_t>(const Sk4b& src) {
 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
     const int _ = ~0;
     auto _32 = _mm_shuffle_epi8(src.fVec, _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_,_,_, 3,_,_,_));
 #else
     auto _16 = _mm_unpacklo_epi8(src.fVec, _mm_setzero_si128()),
          _32 = _mm_unpacklo_epi16(_16,     _mm_setzero_si128());
 #endif
     return _mm_cvtepi32_ps(_32);
 }

 template<> /*static*/ inline Sk4f SkNx_cast<float, uint16_t>(const Sk4h& src) {
     auto _32 = _mm_unpacklo_epi16(src.fVec, _mm_setzero_si128());
     return _mm_cvtepi32_ps(_32);
 }

 static inline void Sk4f_ToBytes(uint8_t bytes[16],
                                 const Sk4f& a, const Sk4f& b, const Sk4f& c, const Sk4f& d) {
     _mm_storeu_si128((__m128i*)bytes,
                      _mm_packus_epi16(_mm_packus_epi16(_mm_cvttps_epi32(a.fVec),
                                                        _mm_cvttps_epi32(b.fVec)),
                                       _mm_packus_epi16(_mm_cvttps_epi32(c.fVec),
                                                        _mm_cvttps_epi32(d.fVec))));
 }

 template<> /*static*/ inline Sk4h SkNx_cast<uint16_t, uint8_t>(const Sk4b& src) {
     return _mm_unpacklo_epi8(src.fVec, _mm_setzero_si128());
 }

 template<> /*static*/ inline Sk4b SkNx_cast<uint8_t, uint16_t>(const Sk4h& src) {
     return _mm_packus_epi16(src.fVec, src.fVec);
 }

 #endif//SkNx_sse_DEFINED
	/*
	* 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_sse_DEFINED
	#define SkNx_sse_DEFINED

	// This file may assume <= SSE2, but must check SK_CPU_SSE_LEVEL for anything more recent.
	// If you do, make sure this is in a static inline function... anywhere else risks violating ODR.

	#define SKNX_IS_FAST

	// SSE 4.1 has _mm_floor_ps to floor 4 floats. We emulate it:
	// - roundtrip through integers via truncation
	// - subtract 1 if that's too big (possible for negative values).
	// This restricts the domain of our inputs to a maximum somehwere around 2^31. Seems plenty big.
	static inline __m128 sse2_mm_floor_ps(__m128 v) {
	__m128 roundtrip = _mm_cvtepi32_ps(_mm_cvttps_epi32(v));
	__m128 too_big = _mm_cmpgt_ps(roundtrip, v);
	return _mm_sub_ps(roundtrip, _mm_and_ps(too_big, _mm_set1_ps(1.0f)));
	}

	template <>
	class SkNx<2, float> {
	public:
	SkNx(const __m128& vec) : fVec(vec) {}

	SkNx() {}
	SkNx(float val) : fVec(_mm_set1_ps(val)) {}
	static SkNx Load(const void* ptr) {
	return _mm_castsi128_ps(_mm_loadl_epi64((const __m128i*)ptr));
	}
	SkNx(float a, float b) : fVec(_mm_setr_ps(a,b,0,0)) {}

	void store(void* ptr) const { _mm_storel_pi((__m64*)ptr, fVec); }

	SkNx operator + (const SkNx& o) const { return _mm_add_ps(fVec, o.fVec); }
	SkNx operator - (const SkNx& o) const { return _mm_sub_ps(fVec, o.fVec); }
	SkNx operator * (const SkNx& o) const { return _mm_mul_ps(fVec, o.fVec); }
	SkNx operator / (const SkNx& o) const { return _mm_div_ps(fVec, o.fVec); }

	SkNx operator == (const SkNx& o) const { return _mm_cmpeq_ps (fVec, o.fVec); }
	SkNx operator != (const SkNx& o) const { return _mm_cmpneq_ps(fVec, o.fVec); }
	SkNx operator < (const SkNx& o) const { return _mm_cmplt_ps (fVec, o.fVec); }
	SkNx operator > (const SkNx& o) const { return _mm_cmpgt_ps (fVec, o.fVec); }
	SkNx operator <= (const SkNx& o) const { return _mm_cmple_ps (fVec, o.fVec); }
	SkNx operator >= (const SkNx& o) const { return _mm_cmpge_ps (fVec, o.fVec); }

	static SkNx Min(const SkNx& l, const SkNx& r) { return _mm_min_ps(l.fVec, r.fVec); }
	static SkNx Max(const SkNx& l, const SkNx& r) { return _mm_max_ps(l.fVec, r.fVec); }

	SkNx sqrt () const { return _mm_sqrt_ps (fVec); }
	SkNx rsqrt0() const { return _mm_rsqrt_ps(fVec); }
	SkNx rsqrt1() const { return this->rsqrt0(); }
	SkNx rsqrt2() const { return this->rsqrt1(); }

	SkNx invert() const { return SkNx(1) / *this; }
	SkNx approxInvert() const { return _mm_rcp_ps(fVec); }

	float operator[](int k) const {
	SkASSERT(0 <= k && k < 2);
	union { __m128 v; float fs[4]; } pun = {fVec};
	return pun.fs[k&1];
	}

	bool allTrue() const { return 0xff == (_mm_movemask_epi8(_mm_castps_si128(fVec)) & 0xff); }
	bool anyTrue() const { return 0x00 != (_mm_movemask_epi8(_mm_castps_si128(fVec)) & 0xff); }

	__m128 fVec;
	};

	template <>
	class SkNx<4, float> {
	public:
	SkNx(const __m128& vec) : fVec(vec) {}

	SkNx() {}
	SkNx(float val) : fVec( _mm_set1_ps(val) ) {}
	static SkNx Load(const void* ptr) { return _mm_loadu_ps((const float*)ptr); }

	SkNx(float a, float b, float c, float d) : fVec(_mm_setr_ps(a,b,c,d)) {}

	void store(void* ptr) const { _mm_storeu_ps((float*)ptr, fVec); }

	SkNx operator + (const SkNx& o) const { return _mm_add_ps(fVec, o.fVec); }
	SkNx operator - (const SkNx& o) const { return _mm_sub_ps(fVec, o.fVec); }
	SkNx operator * (const SkNx& o) const { return _mm_mul_ps(fVec, o.fVec); }
	SkNx operator / (const SkNx& o) const { return _mm_div_ps(fVec, o.fVec); }

	SkNx operator == (const SkNx& o) const { return _mm_cmpeq_ps (fVec, o.fVec); }
	SkNx operator != (const SkNx& o) const { return _mm_cmpneq_ps(fVec, o.fVec); }
	SkNx operator < (const SkNx& o) const { return _mm_cmplt_ps (fVec, o.fVec); }
	SkNx operator > (const SkNx& o) const { return _mm_cmpgt_ps (fVec, o.fVec); }
	SkNx operator <= (const SkNx& o) const { return _mm_cmple_ps (fVec, o.fVec); }
	SkNx operator >= (const SkNx& o) const { return _mm_cmpge_ps (fVec, o.fVec); }

	static SkNx Min(const SkNx& l, const SkNx& r) { return _mm_min_ps(l.fVec, r.fVec); }
	static SkNx Max(const SkNx& l, const SkNx& r) { return _mm_max_ps(l.fVec, r.fVec); }

	SkNx abs() const { return _mm_andnot_ps(_mm_set1_ps(-0.0f), fVec); }
	SkNx floor() const { return sse2_mm_floor_ps(fVec); }

	SkNx sqrt () const { return _mm_sqrt_ps (fVec); }
	SkNx rsqrt0() const { return _mm_rsqrt_ps(fVec); }
	SkNx rsqrt1() const { return this->rsqrt0(); }
	SkNx rsqrt2() const { return this->rsqrt1(); }

	SkNx invert() const { return SkNx(1) / *this; }
	SkNx approxInvert() const { return _mm_rcp_ps(fVec); }

	float operator[](int k) const {
	SkASSERT(0 <= k && k < 4);
	union { __m128 v; float fs[4]; } pun = {fVec};
	return pun.fs[k&3];
	}

	bool allTrue() const { return 0xffff == _mm_movemask_epi8(_mm_castps_si128(fVec)); }
	bool anyTrue() const { return 0x0000 != _mm_movemask_epi8(_mm_castps_si128(fVec)); }

	SkNx thenElse(const SkNx& t, const SkNx& e) const {
	return _mm_or_ps(_mm_and_ps (fVec, t.fVec),
	_mm_andnot_ps(fVec, e.fVec));
	}

	__m128 fVec;
	};

	template <>
	class SkNx<4, int> {
	public:
	SkNx(const __m128i& vec) : fVec(vec) {}

	SkNx() {}
	SkNx(int val) : fVec(_mm_set1_epi32(val)) {}
	static SkNx Load(const void* ptr) { return _mm_loadu_si128((const __m128i*)ptr); }
	SkNx(int a, int b, int c, int d) : fVec(_mm_setr_epi32(a,b,c,d)) {}

	void store(void* ptr) const { _mm_storeu_si128((__m128i*)ptr, fVec); }

	SkNx operator + (const SkNx& o) const { return _mm_add_epi32(fVec, o.fVec); }
	SkNx operator - (const SkNx& o) const { return _mm_sub_epi32(fVec, o.fVec); }
	SkNx operator * (const SkNx& o) const {
	__m128i mul20 = _mm_mul_epu32(fVec, o.fVec),
	mul31 = _mm_mul_epu32(_mm_srli_si128(fVec, 4), _mm_srli_si128(o.fVec, 4));
	return _mm_unpacklo_epi32(_mm_shuffle_epi32(mul20, _MM_SHUFFLE(0,0,2,0)),
	_mm_shuffle_epi32(mul31, _MM_SHUFFLE(0,0,2,0)));
	}

	SkNx operator << (int bits) const { return _mm_slli_epi32(fVec, bits); }
	SkNx operator >> (int bits) const { return _mm_srai_epi32(fVec, bits); }

	int operator[](int k) const {
	SkASSERT(0 <= k && k < 4);
	union { __m128i v; int is[4]; } pun = {fVec};
	return pun.is[k&3];
	}

	__m128i fVec;
	};

	template <>
	class SkNx<4, uint16_t> {
	public:
	SkNx(const __m128i& vec) : fVec(vec) {}

	SkNx() {}
	SkNx(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
	static SkNx Load(const void* ptr) { return _mm_loadl_epi64((const __m128i*)ptr); }
	SkNx(uint16_t a, uint16_t b, uint16_t c, uint16_t d) : fVec(_mm_setr_epi16(a,b,c,d,0,0,0,0)) {}

	void store(void* ptr) const { _mm_storel_epi64((__m128i*)ptr, fVec); }

	SkNx operator + (const SkNx& o) const { return _mm_add_epi16(fVec, o.fVec); }
	SkNx operator - (const SkNx& o) const { return _mm_sub_epi16(fVec, o.fVec); }
	SkNx operator * (const SkNx& o) const { return _mm_mullo_epi16(fVec, o.fVec); }

	SkNx operator << (int bits) const { return _mm_slli_epi16(fVec, bits); }
	SkNx operator >> (int bits) const { return _mm_srli_epi16(fVec, bits); }

	uint16_t operator[](int k) const {
	SkASSERT(0 <= k && k < 4);
	union { __m128i v; uint16_t us[8]; } pun = {fVec};
	return pun.us[k&3];
	}

	__m128i fVec;
	};

	template <>
	class SkNx<8, uint16_t> {
	public:
	SkNx(const __m128i& vec) : fVec(vec) {}

	SkNx() {}
	SkNx(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
	static SkNx Load(const void* ptr) { return _mm_loadu_si128((const __m128i*)ptr); }
	SkNx(uint16_t a, uint16_t b, uint16_t c, uint16_t d,
	uint16_t e, uint16_t f, uint16_t g, uint16_t h) : fVec(_mm_setr_epi16(a,b,c,d,e,f,g,h)) {}

	void store(void* ptr) const { _mm_storeu_si128((__m128i*)ptr, fVec); }

	SkNx operator + (const SkNx& o) const { return _mm_add_epi16(fVec, o.fVec); }
	SkNx operator - (const SkNx& o) const { return _mm_sub_epi16(fVec, o.fVec); }
	SkNx operator * (const SkNx& o) const { return _mm_mullo_epi16(fVec, o.fVec); }

	SkNx operator << (int bits) const { return _mm_slli_epi16(fVec, bits); }
	SkNx operator >> (int bits) const { return _mm_srli_epi16(fVec, bits); }

	static SkNx Min(const SkNx& a, const SkNx& b) {
	// No unsigned _mm_min_epu16, so we'll shift into a space where we can use the
	// signed version, _mm_min_epi16, then shift back.
	const uint16_t top = 0x8000; // Keep this separate from _mm_set1_epi16 or MSVC will whine.
	const __m128i top_8x = _mm_set1_epi16(top);
	return _mm_add_epi8(top_8x, _mm_min_epi16(_mm_sub_epi8(a.fVec, top_8x),
	_mm_sub_epi8(b.fVec, top_8x)));
	}

	SkNx thenElse(const SkNx& t, const SkNx& e) const {
	return _mm_or_si128(_mm_and_si128 (fVec, t.fVec),
	_mm_andnot_si128(fVec, e.fVec));
	}

	uint16_t operator[](int k) const {
	SkASSERT(0 <= k && k < 8);
	union { __m128i v; uint16_t us[8]; } pun = {fVec};
	return pun.us[k&7];
	}

	__m128i fVec;
	};

	template <>
	class SkNx<4, uint8_t> {
	public:
	SkNx(const __m128i& vec) : fVec(vec) {}

	SkNx() {}
	static SkNx Load(const void* ptr) { return _mm_cvtsi32_si128((const int)ptr); }
	void store(void* ptr) const { (int)ptr = _mm_cvtsi128_si32(fVec); }

	// TODO as needed

	__m128i fVec;
	};

	template <>
	class SkNx<16, uint8_t> {
	public:
	SkNx(const __m128i& vec) : fVec(vec) {}

	SkNx() {}
	SkNx(uint8_t val) : fVec(_mm_set1_epi8(val)) {}
	static SkNx Load(const void* ptr) { return _mm_loadu_si128((const __m128i*)ptr); }
	SkNx(uint8_t a, uint8_t b, uint8_t c, uint8_t d,
	uint8_t e, uint8_t f, uint8_t g, uint8_t h,
	uint8_t i, uint8_t j, uint8_t k, uint8_t l,
	uint8_t m, uint8_t n, uint8_t o, uint8_t p)
	: fVec(_mm_setr_epi8(a,b,c,d, e,f,g,h, i,j,k,l, m,n,o,p)) {}

	void store(void* ptr) const { _mm_storeu_si128((__m128i*)ptr, fVec); }

	SkNx saturatedAdd(const SkNx& o) const { return _mm_adds_epu8(fVec, o.fVec); }

	SkNx operator + (const SkNx& o) const { return _mm_add_epi8(fVec, o.fVec); }
	SkNx operator - (const SkNx& o) const { return _mm_sub_epi8(fVec, o.fVec); }

	static SkNx Min(const SkNx& a, const SkNx& b) { return _mm_min_epu8(a.fVec, b.fVec); }
	SkNx operator < (const SkNx& o) const {
	// There's no unsigned _mm_cmplt_epu8, so we flip the sign bits then use a signed compare.
	auto flip = _mm_set1_epi8(char(0x80));
	return _mm_cmplt_epi8(_mm_xor_si128(flip, fVec), _mm_xor_si128(flip, o.fVec));
	}

	uint8_t operator[](int k) const {
	SkASSERT(0 <= k && k < 16);
	union { __m128i v; uint8_t us[16]; } pun = {fVec};
	return pun.us[k&15];
	}

	SkNx thenElse(const SkNx& t, const SkNx& e) const {
	return _mm_or_si128(_mm_and_si128 (fVec, t.fVec),
	_mm_andnot_si128(fVec, e.fVec));
	}

	__m128i fVec;
	};

	template<> /static/ inline Sk4f SkNx_cast<float, int>(const Sk4i& src) {
	return _mm_cvtepi32_ps(src.fVec);
	}

	template <> /static/ inline Sk4i SkNx_cast<int, float>(const Sk4f& src) {
	return _mm_cvttps_epi32(src.fVec);
	}

	template<> /static/ inline Sk4h SkNx_cast<uint16_t, float>(const Sk4f& src) {
	auto _32 = _mm_cvttps_epi32(src.fVec);
	// Ideally we'd use _mm_packus_epi32 here. But that's SSE4.1+.
	#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
	// With SSSE3, we can just shuffle the low 2 bytes from each lane right into place.
	const int _ = ~0;
	return _mm_shuffle_epi8(_32, _mm_setr_epi8(0,1, 4,5, 8,9, 12,13, _,_,_,_,_,_,_,_));
	#else
	// With SSE2, we have to emulate _mm_packus_epi32 with _mm_packs_epi32:
	_32 = _mm_sub_epi32(_32, _mm_set1_epi32((int)0x00008000));
	return _mm_add_epi16(_mm_packs_epi32(_32, _32), _mm_set1_epi16((short)0x8000));
	#endif
	}

	template<> /static/ inline Sk4b SkNx_cast<uint8_t, float>(const Sk4f& src) {
	auto _32 = _mm_cvttps_epi32(src.fVec);
	#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
	const int _ = ~0;
	return _mm_shuffle_epi8(_32, _mm_setr_epi8(0,4,8,12, _,_,_,_, _,_,_,_, _,_,_,_));
	#else
	auto _16 = _mm_packus_epi16(_32, _32);
	return _mm_packus_epi16(_16, _16);
	#endif
	}

	template<> /static/ inline Sk4f SkNx_cast<float, uint8_t>(const Sk4b& src) {
	#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
	const int _ = ~0;
	auto _32 = _mm_shuffle_epi8(src.fVec, _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_,_,_, 3,_,_,_));
	#else
	auto _16 = _mm_unpacklo_epi8(src.fVec, _mm_setzero_si128()),
	_32 = _mm_unpacklo_epi16(_16, _mm_setzero_si128());
	#endif
	return _mm_cvtepi32_ps(_32);
	}

	template<> /static/ inline Sk4f SkNx_cast<float, uint16_t>(const Sk4h& src) {
	auto _32 = _mm_unpacklo_epi16(src.fVec, _mm_setzero_si128());
	return _mm_cvtepi32_ps(_32);
	}

	static inline void Sk4f_ToBytes(uint8_t bytes[16],
	const Sk4f& a, const Sk4f& b, const Sk4f& c, const Sk4f& d) {
	_mm_storeu_si128((__m128i*)bytes,
	_mm_packus_epi16(_mm_packus_epi16(_mm_cvttps_epi32(a.fVec),
	_mm_cvttps_epi32(b.fVec)),
	_mm_packus_epi16(_mm_cvttps_epi32(c.fVec),
	_mm_cvttps_epi32(d.fVec))));
	}

	template<> /static/ inline Sk4h SkNx_cast<uint16_t, uint8_t>(const Sk4b& src) {
	return _mm_unpacklo_epi8(src.fVec, _mm_setzero_si128());
	}

	template<> /static/ inline Sk4b SkNx_cast<uint8_t, uint16_t>(const Sk4h& src) {
	return _mm_packus_epi16(src.fVec, src.fVec);
	}

	#endif//SkNx_sse_DEFINED