clean up dead x86 filter opts code

src/opts/SkBitmapProcState_opts_SSE2.cpp

Index: src/opts/SkBitmapProcState_opts_SSE2.cpp
diff --git a/src/opts/SkBitmapProcState_opts_SSE2.cpp b/src/opts/SkBitmapProcState_opts_SSE2.cpp
index 68d920d8d81f12b0756e1fe077e64aea3b074b38..cffe9625e508cec2cbe1ff149f0df8909923419f 100644
--- a/src/opts/SkBitmapProcState_opts_SSE2.cpp
+++ b/src/opts/SkBitmapProcState_opts_SSE2.cpp
@@ -632,117 +632,3 @@ void ClampX_ClampY_nofilter_affine_SSE2(const SkBitmapProcState& s,
         fy += dy;
     }
 }
-
-/*  SSE version of S32_D16_filter_DX_SSE2
- *  Definition is in section of "D16 functions for SRC == 8888" in SkBitmapProcState.cpp
- *  It combines S32_opaque_D32_filter_DX_SSE2 and SkPixel32ToPixel16
- */
-void S32_D16_filter_DX_SSE2(const SkBitmapProcState& s,
-                            const uint32_t* xy,
-                            int count, uint16_t* colors) {
-    SkASSERT(count > 0 && colors != nullptr);
-    SkASSERT(s.fFilterLevel != kNone_SkFilterQuality);
-    SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
-    SkASSERT(s.fPixmap.isOpaque());
-
-    SkPMColor dstColor;
-    const char* srcAddr = static_cast<const char*>(s.fPixmap.addr());
-    size_t rb = s.fPixmap.rowBytes();
-    uint32_t XY = *xy++;
-    unsigned y0 = XY >> 14;
-    const uint32_t* row0 = reinterpret_cast<const uint32_t*>(srcAddr + (y0 >> 4) * rb);
-    const uint32_t* row1 = reinterpret_cast<const uint32_t*>(srcAddr + (XY & 0x3FFF) * rb);
-    unsigned subY = y0 & 0xF;
-
-    // ( 0,  0,  0,  0,  0,  0,  0, 16)
-    __m128i sixteen = _mm_cvtsi32_si128(16);
-
-    // ( 0,  0,  0,  0, 16, 16, 16, 16)
-    sixteen = _mm_shufflelo_epi16(sixteen, 0);
-
-    // ( 0,  0,  0,  0,  0,  0,  0,  y)
-    __m128i allY = _mm_cvtsi32_si128(subY);
-
-    // ( 0,  0,  0,  0,  y,  y,  y,  y)
-    allY = _mm_shufflelo_epi16(allY, 0);
-
-    // ( 0,  0,  0,  0, 16-y, 16-y, 16-y, 16-y)
-    __m128i negY = _mm_sub_epi16(sixteen, allY);
-
-    // (16-y, 16-y, 16-y, 16-y, y, y, y, y)
-    allY = _mm_unpacklo_epi64(allY, negY);
-
-    // (16, 16, 16, 16, 16, 16, 16, 16 )
-    sixteen = _mm_shuffle_epi32(sixteen, 0);
-
-    // ( 0,  0,  0,  0,  0,  0,  0,  0)
-    __m128i zero = _mm_setzero_si128();
-
-    do {
-        uint32_t XX = *xy++;    // x0:14 | 4 | x1:14
-        unsigned x0 = XX >> 18;
-        unsigned x1 = XX & 0x3FFF;
-
-        // (0, 0, 0, 0, 0, 0, 0, x)
-        __m128i allX = _mm_cvtsi32_si128((XX >> 14) & 0x0F);
-
-        // (0, 0, 0, 0, x, x, x, x)
-        allX = _mm_shufflelo_epi16(allX, 0);
-
-        // (x, x, x, x, x, x, x, x)
-        allX = _mm_shuffle_epi32(allX, 0);
-
-        // (16-x, 16-x, 16-x, 16-x, 16-x, 16-x, 16-x)
-        __m128i negX = _mm_sub_epi16(sixteen, allX);
-
-        // Load 4 samples (pixels).
-        __m128i a00 = _mm_cvtsi32_si128(row0[x0]);
-        __m128i a01 = _mm_cvtsi32_si128(row0[x1]);
-        __m128i a10 = _mm_cvtsi32_si128(row1[x0]);
-        __m128i a11 = _mm_cvtsi32_si128(row1[x1]);
-
-        // (0, 0, a00, a10)
-        __m128i a00a10 = _mm_unpacklo_epi32(a10, a00);
-
-        // Expand to 16 bits per component.
-        a00a10 = _mm_unpacklo_epi8(a00a10, zero);
-
-        // ((a00 * (16-y)), (a10 * y)).
-        a00a10 = _mm_mullo_epi16(a00a10, allY);
-
-        // (a00 * (16-y) * (16-x), a10 * y * (16-x)).
-        a00a10 = _mm_mullo_epi16(a00a10, negX);
-
-        // (0, 0, a01, a10)
-        __m128i a01a11 = _mm_unpacklo_epi32(a11, a01);
-
-        // Expand to 16 bits per component.
-        a01a11 = _mm_unpacklo_epi8(a01a11, zero);
-
-        // (a01 * (16-y)), (a11 * y)
-        a01a11 = _mm_mullo_epi16(a01a11, allY);
-
-        // (a01 * (16-y) * x), (a11 * y * x)
-        a01a11 = _mm_mullo_epi16(a01a11, allX);
-
-        // (a00*w00 + a01*w01, a10*w10 + a11*w11)
-        __m128i sum = _mm_add_epi16(a00a10, a01a11);
-
-        // (DC, a00*w00 + a01*w01)
-        __m128i shifted = _mm_shuffle_epi32(sum, 0xEE);
-
-        // (DC, a00*w00 + a01*w01 + a10*w10 + a11*w11)
-        sum = _mm_add_epi16(sum, shifted);
-
-        // Divide each 16 bit component by 256.
-        sum = _mm_srli_epi16(sum, 8);
-
-        // Pack lower 4 16 bit values of sum into lower 4 bytes.
-        sum = _mm_packus_epi16(sum, zero);
-
-        // Extract low int and store.
-        dstColor = _mm_cvtsi128_si32(sum);
-
-        *colors++ = SkPixel32ToPixel16(dstColor);
-    } while (--count > 0);
-}