Implement four more xfermodes with Sk4px.

src/opts/SkNx_sse.h

 /*
  * 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 SkNb<2, 4> {
-public:
-    SkNb(const __m128i& vec) : fVec(vec) {}
-
-    SkNb() {}
-    bool allTrue() const { return 0xff == (_mm_movemask_epi8(fVec) & 0xff); }
-    bool anyTrue() const { return 0x00 != (_mm_movemask_epi8(fVec) & 0xff); }
-
-    __m128i fVec;
-};
-
-template <>
-class SkNb<4, 4> {
-public:
-    SkNb(const __m128i& vec) : fVec(vec) {}
-
-    SkNb() {}
-    bool allTrue() const { return 0xffff == _mm_movemask_epi8(fVec); }
-    bool anyTrue() const { return 0x0000 != _mm_movemask_epi8(fVec); }
-
-    __m128i fVec;
-};
-
-template <>
-class SkNb<2, 8> {
-public:
-    SkNb(const __m128i& vec) : fVec(vec) {}
-
-    SkNb() {}
-    bool allTrue() const { return 0xffff == _mm_movemask_epi8(fVec); }
-    bool anyTrue() const { return 0x0000 != _mm_movemask_epi8(fVec); }
-
-    __m128i fVec;
-};
-
 
 template <>
 class SkNf<2, float> {
-    typedef SkNb<2, 4> Nb;
 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); }
 
-    Nb operator == (const SkNf& o) const { return _mm_castps_si128(_mm_cmpeq_ps (fVec, o.fVec)); }
-    Nb operator != (const SkNf& o) const { return _mm_castps_si128(_mm_cmpneq_ps(fVec, o.fVec)); }
-    Nb operator  < (const SkNf& o) const { return _mm_castps_si128(_mm_cmplt_ps (fVec, o.fVec)); }
-    Nb operator  > (const SkNf& o) const { return _mm_castps_si128(_mm_cmpgt_ps (fVec, o.fVec)); }
-    Nb operator <= (const SkNf& o) const { return _mm_castps_si128(_mm_cmple_ps (fVec, o.fVec)); }
-    Nb operator >= (const SkNf& o) const { return _mm_castps_si128(_mm_cmpge_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> {
-    typedef SkNb<2, 8> Nb;
 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); }
 
-    Nb operator == (const SkNf& o) const { return _mm_castpd_si128(_mm_cmpeq_pd (fVec, o.fVec)); }
-    Nb operator != (const SkNf& o) const { return _mm_castpd_si128(_mm_cmpneq_pd(fVec, o.fVec)); }
-    Nb operator  < (const SkNf& o) const { return _mm_castpd_si128(_mm_cmplt_pd (fVec, o.fVec)); }
-    Nb operator  > (const SkNf& o) const { return _mm_castpd_si128(_mm_cmpgt_pd (fVec, o.fVec)); }
-    Nb operator <= (const SkNf& o) const { return _mm_castpd_si128(_mm_cmple_pd (fVec, o.fVec)); }
-    Nb operator >= (const SkNf& o) const { return _mm_castpd_si128(_mm_cmpge_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)) {}
@@ skipping 23 matching lines @@
             case 3: return _mm_cvtsi128_si32(_mm_srli_si128(fVec, 12));
             default: SkASSERT(false); return 0;
         }
     }
 
     __m128i fVec;
 };
 
 template <>
 class SkNf<4, float> {
-    typedef SkNb<4, 4> Nb;
 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); }
     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); }
 
     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); }
 
-    Nb operator == (const SkNf& o) const { return _mm_castps_si128(_mm_cmpeq_ps (fVec, o.fVec)); }
-    Nb operator != (const SkNf& o) const { return _mm_castps_si128(_mm_cmpneq_ps(fVec, o.fVec)); }
-    Nb operator  < (const SkNf& o) const { return _mm_castps_si128(_mm_cmplt_ps (fVec, o.fVec)); }
-    Nb operator  > (const SkNf& o) const { return _mm_castps_si128(_mm_cmpgt_ps (fVec, o.fVec)); }
-    Nb operator <= (const SkNf& o) const { return _mm_castps_si128(_mm_cmple_ps (fVec, o.fVec)); }
-    Nb operator >= (const SkNf& o) const { return _mm_castps_si128(_mm_cmpge_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)); }
+
     __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)) {}
@@ skipping 69 matching lines @@
         : 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