src/opts/SkNx_sse.h - platform/external/skqp - Gitiles

 /*
  * 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.

 namespace {  // See SkNx.h


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

     SkNf() {}
     explicit SkNf(float val) : fVec(_mm_set1_ps(val)) {}
     static SkNf Load(const float vals[2]) {
         return _mm_castsi128_ps(_mm_loadl_epi64((const __m128i*)vals));
     }
     SkNf(float a, float b) : fVec(_mm_setr_ps(a,b,0,0)) {}

     void store(float vals[2]) const { _mm_storel_pi((__m64*)vals, fVec); }

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

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

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

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

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

     template <int k> float kth() 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 SkNf<2, double> {
 public:
     SkNf(const __m128d& vec) : fVec(vec) {}

     SkNf() {}
     explicit SkNf(double val)           : fVec( _mm_set1_pd(val) ) {}
     static SkNf Load(const double vals[2]) { return _mm_loadu_pd(vals); }
     SkNf(double a, double b) : fVec(_mm_setr_pd(a,b)) {}

     void store(double vals[2]) const { _mm_storeu_pd(vals, fVec); }

     SkNf operator + (const SkNf& o) const { return _mm_add_pd(fVec, o.fVec); }
     SkNf operator - (const SkNf& o) const { return _mm_sub_pd(fVec, o.fVec); }
     SkNf operator * (const SkNf& o) const { return _mm_mul_pd(fVec, o.fVec); }
     SkNf operator / (const SkNf& o) const { return _mm_div_pd(fVec, o.fVec); }

     SkNf operator == (const SkNf& o) const { return _mm_cmpeq_pd (fVec, o.fVec); }
     SkNf operator != (const SkNf& o) const { return _mm_cmpneq_pd(fVec, o.fVec); }
     SkNf operator  < (const SkNf& o) const { return _mm_cmplt_pd (fVec, o.fVec); }
     SkNf operator  > (const SkNf& o) const { return _mm_cmpgt_pd (fVec, o.fVec); }
     SkNf operator <= (const SkNf& o) const { return _mm_cmple_pd (fVec, o.fVec); }
     SkNf operator >= (const SkNf& o) const { return _mm_cmpge_pd (fVec, o.fVec); }

     static SkNf Min(const SkNf& l, const SkNf& r) { return _mm_min_pd(l.fVec, r.fVec); }
     static SkNf Max(const SkNf& l, const SkNf& r) { return _mm_max_pd(l.fVec, r.fVec); }

     SkNf  sqrt() const { return _mm_sqrt_pd(fVec);  }
     SkNf rsqrt0() const { return _mm_cvtps_pd(_mm_rsqrt_ps(_mm_cvtpd_ps(fVec))); }
     SkNf rsqrt1() const { return this->rsqrt0(); }
     SkNf rsqrt2() const { return this->rsqrt1(); }

     SkNf       invert() const { return SkNf(1) / *this; }
     SkNf approxInvert() const { return _mm_cvtps_pd(_mm_rcp_ps(_mm_cvtpd_ps(fVec))); }

     template <int k> double kth() const {
         SkASSERT(0 <= k && k < 2);
         union { __m128d v; double ds[2]; } pun = {fVec};
         return pun.ds[k&1];
     }

     bool allTrue() const { return 0xffff == _mm_movemask_epi8(_mm_castpd_si128(fVec)); }
     bool anyTrue() const { return 0x0000 != _mm_movemask_epi8(_mm_castpd_si128(fVec)); }

     __m128d fVec;
 };

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

     SkNi() {}
     explicit SkNi(int val) : fVec(_mm_set1_epi32(val)) {}
     static SkNi Load(const int vals[4]) { return _mm_loadu_si128((const __m128i*)vals); }
     SkNi(int a, int b, int c, int d) : fVec(_mm_setr_epi32(a,b,c,d)) {}

     void store(int vals[4]) const { _mm_storeu_si128((__m128i*)vals, fVec); }

     SkNi operator + (const SkNi& o) const { return _mm_add_epi32(fVec, o.fVec); }
     SkNi operator - (const SkNi& o) const { return _mm_sub_epi32(fVec, o.fVec); }
     SkNi operator * (const SkNi& 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)));
     }

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

     template <int k> int kth() const {
         SkASSERT(0 <= k && k < 4);
         switch (k) {
             case 0: return _mm_cvtsi128_si32(fVec);
             case 1: return _mm_cvtsi128_si32(_mm_srli_si128(fVec,  4));
             case 2: return _mm_cvtsi128_si32(_mm_srli_si128(fVec,  8));
             case 3: return _mm_cvtsi128_si32(_mm_srli_si128(fVec, 12));
             default: SkASSERT(false); return 0;
         }
     }

     __m128i fVec;
 };

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

     SkNf() {}
     explicit SkNf(float val)           : fVec( _mm_set1_ps(val) ) {}
     static SkNf Load(const float vals[4]) { return _mm_loadu_ps(vals); }

     static SkNf FromBytes(const uint8_t bytes[4]) {
         __m128i fix8 = _mm_cvtsi32_si128(*(const int*)bytes);
     #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
         const char _ = ~0;  // Zero these bytes.
         __m128i fix8_32 = _mm_shuffle_epi8(fix8, _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_,_,_, 3,_,_,_));
     #else
         __m128i fix8_16 = _mm_unpacklo_epi8 (fix8,    _mm_setzero_si128()),
                 fix8_32 = _mm_unpacklo_epi16(fix8_16, _mm_setzero_si128());
     #endif
         return SkNf(_mm_cvtepi32_ps(fix8_32));
         // TODO: use _mm_cvtepu8_epi32 w/SSE4.1?
     }

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

     void store(float vals[4]) const { _mm_storeu_ps(vals, fVec); }
     void toBytes(uint8_t bytes[4]) const {
         __m128i fix8_32 = _mm_cvttps_epi32(fVec),
                 fix8_16 = _mm_packus_epi16(fix8_32, fix8_32),
                 fix8    = _mm_packus_epi16(fix8_16, fix8_16);
         *(int*)bytes = _mm_cvtsi128_si32(fix8);
     }

     SkNi<4, int> castTrunc() const { return _mm_cvttps_epi32(fVec); }

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

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

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

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

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

     template <int k> float kth() 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)); }

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

     __m128 fVec;
 };

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

     SkNi() {}
     explicit SkNi(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
     static SkNi Load(const uint16_t vals[4]) { return _mm_loadl_epi64((const __m128i*)vals); }
     SkNi(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(uint16_t vals[4]) const { _mm_storel_epi64((__m128i*)vals, fVec); }

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

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

     template <int k> uint16_t kth() const {
         SkASSERT(0 <= k && k < 4);
         return _mm_extract_epi16(fVec, k);
     }

     __m128i fVec;
 };

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

     SkNi() {}
     explicit SkNi(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
     static SkNi Load(const uint16_t vals[8]) { return _mm_loadu_si128((const __m128i*)vals); }
     SkNi(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(uint16_t vals[8]) const { _mm_storeu_si128((__m128i*)vals, fVec); }

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

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

     static SkNi Min(const SkNi& a, const SkNi& 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)));
     }

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

     template <int k> uint16_t kth() const {
         SkASSERT(0 <= k && k < 8);
         return _mm_extract_epi16(fVec, k);
     }

     __m128i fVec;
 };

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

     SkNi() {}
     explicit SkNi(uint8_t val) : fVec(_mm_set1_epi8(val)) {}
     static SkNi Load(const uint8_t vals[16]) { return _mm_loadu_si128((const __m128i*)vals); }
     SkNi(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(uint8_t vals[16]) const { _mm_storeu_si128((__m128i*)vals, fVec); }

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

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

     static SkNi Min(const SkNi& a, const SkNi& b) { return _mm_min_epu8(a.fVec, b.fVec); }
     SkNi operator < (const SkNi& 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));
     }

     template <int k> uint8_t kth() const {
         SkASSERT(0 <= k && k < 16);
         // SSE4.1 would just `return _mm_extract_epi8(fVec, k)`.  We have to read 16-bits instead.
         int pair = _mm_extract_epi16(fVec, k/2);
         return k % 2 == 0 ? pair : (pair >> 8);
     }

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

     __m128i fVec;
 };

 }  // namespace

 #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.

	namespace { // See SkNx.h


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

	SkNf() {}
	explicit SkNf(float val) : fVec(_mm_set1_ps(val)) {}
	static SkNf Load(const float vals[2]) {
	return _mm_castsi128_ps(_mm_loadl_epi64((const __m128i*)vals));
	}
	SkNf(float a, float b) : fVec(_mm_setr_ps(a,b,0,0)) {}

	void store(float vals[2]) const { _mm_storel_pi((__m64*)vals, fVec); }

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

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

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

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

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

	template <int k> float kth() 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 SkNf<2, double> {
	public:
	SkNf(const __m128d& vec) : fVec(vec) {}

	SkNf() {}
	explicit SkNf(double val) : fVec( _mm_set1_pd(val) ) {}
	static SkNf Load(const double vals[2]) { return _mm_loadu_pd(vals); }
	SkNf(double a, double b) : fVec(_mm_setr_pd(a,b)) {}

	void store(double vals[2]) const { _mm_storeu_pd(vals, fVec); }

	SkNf operator + (const SkNf& o) const { return _mm_add_pd(fVec, o.fVec); }
	SkNf operator - (const SkNf& o) const { return _mm_sub_pd(fVec, o.fVec); }
	SkNf operator * (const SkNf& o) const { return _mm_mul_pd(fVec, o.fVec); }
	SkNf operator / (const SkNf& o) const { return _mm_div_pd(fVec, o.fVec); }

	SkNf operator == (const SkNf& o) const { return _mm_cmpeq_pd (fVec, o.fVec); }
	SkNf operator != (const SkNf& o) const { return _mm_cmpneq_pd(fVec, o.fVec); }
	SkNf operator < (const SkNf& o) const { return _mm_cmplt_pd (fVec, o.fVec); }
	SkNf operator > (const SkNf& o) const { return _mm_cmpgt_pd (fVec, o.fVec); }
	SkNf operator <= (const SkNf& o) const { return _mm_cmple_pd (fVec, o.fVec); }
	SkNf operator >= (const SkNf& o) const { return _mm_cmpge_pd (fVec, o.fVec); }

	static SkNf Min(const SkNf& l, const SkNf& r) { return _mm_min_pd(l.fVec, r.fVec); }
	static SkNf Max(const SkNf& l, const SkNf& r) { return _mm_max_pd(l.fVec, r.fVec); }

	SkNf sqrt() const { return _mm_sqrt_pd(fVec); }
	SkNf rsqrt0() const { return _mm_cvtps_pd(_mm_rsqrt_ps(_mm_cvtpd_ps(fVec))); }
	SkNf rsqrt1() const { return this->rsqrt0(); }
	SkNf rsqrt2() const { return this->rsqrt1(); }

	SkNf invert() const { return SkNf(1) / *this; }
	SkNf approxInvert() const { return _mm_cvtps_pd(_mm_rcp_ps(_mm_cvtpd_ps(fVec))); }

	template <int k> double kth() const {
	SkASSERT(0 <= k && k < 2);
	union { __m128d v; double ds[2]; } pun = {fVec};
	return pun.ds[k&1];
	}

	bool allTrue() const { return 0xffff == _mm_movemask_epi8(_mm_castpd_si128(fVec)); }
	bool anyTrue() const { return 0x0000 != _mm_movemask_epi8(_mm_castpd_si128(fVec)); }

	__m128d fVec;
	};

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

	SkNi() {}
	explicit SkNi(int val) : fVec(_mm_set1_epi32(val)) {}
	static SkNi Load(const int vals[4]) { return _mm_loadu_si128((const __m128i*)vals); }
	SkNi(int a, int b, int c, int d) : fVec(_mm_setr_epi32(a,b,c,d)) {}

	void store(int vals[4]) const { _mm_storeu_si128((__m128i*)vals, fVec); }

	SkNi operator + (const SkNi& o) const { return _mm_add_epi32(fVec, o.fVec); }
	SkNi operator - (const SkNi& o) const { return _mm_sub_epi32(fVec, o.fVec); }
	SkNi operator * (const SkNi& 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)));
	}

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

	template <int k> int kth() const {
	SkASSERT(0 <= k && k < 4);
	switch (k) {
	case 0: return _mm_cvtsi128_si32(fVec);
	case 1: return _mm_cvtsi128_si32(_mm_srli_si128(fVec, 4));
	case 2: return _mm_cvtsi128_si32(_mm_srli_si128(fVec, 8));
	case 3: return _mm_cvtsi128_si32(_mm_srli_si128(fVec, 12));
	default: SkASSERT(false); return 0;
	}
	}

	__m128i fVec;
	};

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

	SkNf() {}
	explicit SkNf(float val) : fVec( _mm_set1_ps(val) ) {}
	static SkNf Load(const float vals[4]) { return _mm_loadu_ps(vals); }

	static SkNf FromBytes(const uint8_t bytes[4]) {
	__m128i fix8 = _mm_cvtsi32_si128((const int)bytes);
	#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
	const char _ = ~0; // Zero these bytes.
	__m128i fix8_32 = _mm_shuffle_epi8(fix8, _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_,_,_, 3,_,_,_));
	#else
	__m128i fix8_16 = _mm_unpacklo_epi8 (fix8, _mm_setzero_si128()),
	fix8_32 = _mm_unpacklo_epi16(fix8_16, _mm_setzero_si128());
	#endif
	return SkNf(_mm_cvtepi32_ps(fix8_32));
	// TODO: use _mm_cvtepu8_epi32 w/SSE4.1?
	}

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

	void store(float vals[4]) const { _mm_storeu_ps(vals, fVec); }
	void toBytes(uint8_t bytes[4]) const {
	__m128i fix8_32 = _mm_cvttps_epi32(fVec),
	fix8_16 = _mm_packus_epi16(fix8_32, fix8_32),
	fix8 = _mm_packus_epi16(fix8_16, fix8_16);
	(int)bytes = _mm_cvtsi128_si32(fix8);
	}

	SkNi<4, int> castTrunc() const { return _mm_cvttps_epi32(fVec); }

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

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

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

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

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

	template <int k> float kth() 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)); }

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

	__m128 fVec;
	};

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

	SkNi() {}
	explicit SkNi(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
	static SkNi Load(const uint16_t vals[4]) { return _mm_loadl_epi64((const __m128i*)vals); }
	SkNi(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(uint16_t vals[4]) const { _mm_storel_epi64((__m128i*)vals, fVec); }

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

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

	template <int k> uint16_t kth() const {
	SkASSERT(0 <= k && k < 4);
	return _mm_extract_epi16(fVec, k);
	}

	__m128i fVec;
	};

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

	SkNi() {}
	explicit SkNi(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
	static SkNi Load(const uint16_t vals[8]) { return _mm_loadu_si128((const __m128i*)vals); }
	SkNi(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(uint16_t vals[8]) const { _mm_storeu_si128((__m128i*)vals, fVec); }

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

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

	static SkNi Min(const SkNi& a, const SkNi& 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)));
	}

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

	template <int k> uint16_t kth() const {
	SkASSERT(0 <= k && k < 8);
	return _mm_extract_epi16(fVec, k);
	}

	__m128i fVec;
	};

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

	SkNi() {}
	explicit SkNi(uint8_t val) : fVec(_mm_set1_epi8(val)) {}
	static SkNi Load(const uint8_t vals[16]) { return _mm_loadu_si128((const __m128i*)vals); }
	SkNi(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(uint8_t vals[16]) const { _mm_storeu_si128((__m128i*)vals, fVec); }

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

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

	static SkNi Min(const SkNi& a, const SkNi& b) { return _mm_min_epu8(a.fVec, b.fVec); }
	SkNi operator < (const SkNi& 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));
	}

	template <int k> uint8_t kth() const {
	SkASSERT(0 <= k && k < 16);
	// SSE4.1 would just `return _mm_extract_epi8(fVec, k)`. We have to read 16-bits instead.
	int pair = _mm_extract_epi16(fVec, k/2);
	return k % 2 == 0 ? pair : (pair >> 8);
	}

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

	__m128i fVec;
	};

	} // namespace

	#endif//SkNx_sse_DEFINED