Issue %3005 - Move gfx/ to system/graphics

1 files changed, 588 insertions, 0 deletions

diff --git a/system/graphics/2d/BlurLS3.cpp b/system/graphics/2d/BlurLS3.cpp
new file mode 100644
index 000000000..20c28b37e
--- /dev/null
+++ b/system/graphics/2d/BlurLS3.cpp
@@ -0,0 +1,588 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Blur.h"
+
+#include <string.h>
+
+#ifdef _MIPS_ARCH_LOONGSON3A
+
+#include "MMIHelpers.h"
+
+namespace mozilla {
+namespace gfx {
+
+typedef struct { double l; double h; } __m128i;
+
+MOZ_ALWAYS_INLINE
+__m128i loadUnaligned128(__m128i *p)
+{
+  __m128i v;
+
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    "gsldlc1 %[vh], 0xf(%[p]) \n\t"
+    "gsldrc1 %[vh], 0x8(%[p]) \n\t"
+    "gsldlc1 %[vl], 0x7(%[p]) \n\t"
+    "gsldrc1 %[vl], 0x0(%[p]) \n\t"
+    ".set pop \n\t"
+    :[vh]"=f"(v.h), [vl]"=f"(v.l)
+    :[p]"r"(p)
+    :"memory"
+  );
+
+  return v;
+}
+
+MOZ_ALWAYS_INLINE
+__m128i Divide(__m128i aValues, __m128i aDivisor)
+{
+  uint64_t tmp;
+  double srl32;
+  __m128i mask, ra, p4321, t1, t2;
+
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    "li %[tmp], 0x80000000 \n\t"
+    "mtc1 %[tmp], %[ral] \n\t"
+    "xor %[maskl], %[maskl], %[maskl] \n\t"
+    "mov.d %[rah], %[ral] \n\t"
+    "li %[tmp], 0xffffffff \n\t"
+    "mthc1 %[tmp], %[maskl] \n\t"
+    "mov.d %[maskh], %[maskl] \n\t"
+    ".set pop \n\t"
+    :[rah]"=f"(ra.h), [ral]"=f"(ra.l),
+     [maskh]"=f"(mask.h), [maskl]"=f"(mask.l),
+     [tmp]"=&r"(tmp)
+  );
+
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    "ori %[tmp], $0, 32 \n\t"
+    "mtc1 %[tmp], %[srl32] \n\t"
+    _mm_pmuluw(t1, av, ad)
+    _mm_psrld(t2, av, srl32)
+    _mm_pmuluw(t2, t2, ad)
+    // Add 1 << 31 before shifting or masking the lower 32 bits away, so that the
+    // result is rounded.
+    _mm_paddd(t1, t1, ra)
+    _mm_psrld(t1, t1, srl32)
+    _mm_paddd(t2, t2, ra)
+    _mm_and(t2, t2, mask)
+    _mm_or(p4321, t1, t2)
+    ".set pop \n\t"
+    :[p4321h]"=&f"(p4321.h), [p4321l]"=&f"(p4321.l),
+     [t1h]"=&f"(t1.h), [t1l]"=&f"(t1.l),
+     [t2h]"=&f"(t2.h), [t2l]"=&f"(t2.l),
+     [srl32]"=&f"(srl32), [tmp]"=&r"(tmp)
+    :[rah]"f"(ra.h), [ral]"f"(ra.l),
+     [maskh]"f"(mask.h), [maskl]"f"(mask.l),
+     [avh]"f"(aValues.h), [avl]"f"(aValues.l),
+     [adh]"f"(aDivisor.h), [adl]"f"(aDivisor.l)
+  );
+
+  return p4321;
+}
+
+MOZ_ALWAYS_INLINE
+__m128i BlurFourPixels(const __m128i& aTopLeft, const __m128i& aTopRight,
+                       const __m128i& aBottomRight, const __m128i& aBottomLeft,
+                       const __m128i& aDivisor)
+{
+  __m128i values;
+
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    _mm_psubw(val, abr, atr)
+    _mm_psubw(val, val, abl)
+    _mm_paddw(val, val, atl)
+    ".set pop \n\t"
+    :[valh]"=&f"(values.h), [vall]"=&f"(values.l)
+    :[abrh]"f"(aBottomRight.h), [abrl]"f"(aBottomRight.l),
+     [atrh]"f"(aTopRight.h), [atrl]"f"(aTopRight.l),
+     [ablh]"f"(aBottomLeft.h), [abll]"f"(aBottomLeft.l),
+     [atlh]"f"(aTopLeft.h), [atll]"f"(aTopLeft.l)
+  );
+
+  return Divide(values, aDivisor);
+}
+
+MOZ_ALWAYS_INLINE
+void LoadIntegralRowFromRow(uint32_t *aDest, const uint8_t *aSource,
+                            int32_t aSourceWidth, int32_t aLeftInflation,
+                            int32_t aRightInflation)
+{
+  int32_t currentRowSum = 0;
+
+  for (int x = 0; x < aLeftInflation; x++) {
+    currentRowSum += aSource[0];
+    aDest[x] = currentRowSum;
+  }
+  for (int x = aLeftInflation; x < (aSourceWidth + aLeftInflation); x++) {
+    currentRowSum += aSource[(x - aLeftInflation)];
+    aDest[x] = currentRowSum;
+  }
+  for (int x = (aSourceWidth + aLeftInflation); x < (aSourceWidth + aLeftInflation + aRightInflation); x++) {
+    currentRowSum += aSource[aSourceWidth - 1];
+    aDest[x] = currentRowSum;
+  }
+}
+
+// This function calculates an integral of four pixels stored in the 4
+// 32-bit integers on aPixels. i.e. for { 30, 50, 80, 100 } this returns
+// { 30, 80, 160, 260 }. This seems to be the fastest way to do this after
+// much testing.
+MOZ_ALWAYS_INLINE
+__m128i AccumulatePixelSums(__m128i aPixels)
+{
+  uint64_t tr;
+  double tmp, s4, s64;
+  __m128i sumPixels, currentPixels, zero;
+
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    _mm_xor(z, z, z)
+    "li %[tr], 64 \n\t"
+    "mtc1 %[tr], %[s64] \n\t"
+    "li %[tr], 32 \n\t"
+    "mtc1 %[tr], %[s4] \n\t"
+    _mm_psllq(cp, ap, s4, s64, t)
+    _mm_paddw(sp, ap, cp)
+    _mm_punpckldq(cp, z, sp)
+    _mm_paddw(sp, sp, cp)
+    ".set pop \n\t"
+    :[sph]"=&f"(sumPixels.h), [spl]"=&f"(sumPixels.l),
+     [cph]"=&f"(currentPixels.h), [cpl]"=&f"(currentPixels.l),
+     [zh]"=&f"(zero.h), [zl]"=&f"(zero.l),
+     [s4]"=&f"(s4), [s64]"=&f"(s64), [t]"=&f"(tmp), [tr]"=&r"(tr)
+    :[aph]"f"(aPixels.h), [apl]"f"(aPixels.l)
+  );
+
+  return sumPixels;
+}
+
+MOZ_ALWAYS_INLINE
+void GenerateIntegralImage_LS3(int32_t aLeftInflation, int32_t aRightInflation,
+                           int32_t aTopInflation, int32_t aBottomInflation,
+                           uint32_t *aIntegralImage, size_t aIntegralImageStride,
+                           uint8_t *aSource, int32_t aSourceStride, const IntSize &aSize)
+{
+  MOZ_ASSERT(!(aLeftInflation & 3));
+
+  uint32_t stride32bit = aIntegralImageStride / 4;
+
+  IntSize integralImageSize(aSize.width + aLeftInflation + aRightInflation,
+                            aSize.height + aTopInflation + aBottomInflation);
+
+  LoadIntegralRowFromRow(aIntegralImage, aSource, aSize.width, aLeftInflation, aRightInflation);
+
+  for (int y = 1; y < aTopInflation + 1; y++) {
+    uint32_t *intRow = aIntegralImage + (y * stride32bit);
+    uint32_t *intPrevRow = aIntegralImage + (y - 1) * stride32bit;
+    uint32_t *intFirstRow = aIntegralImage;
+
+    for (int x = 0; x < integralImageSize.width; x += 4) {
+      __m128i firstRow, previousRow;
+
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        "gslqc1 %[frh], %[frl], (%[fr]) \n\t"
+        "gslqc1 %[prh], %[prl], (%[pr]) \n\t"
+        _mm_paddw(fr, fr, pr)
+        "gssqc1 %[frh], %[frl], (%[r]) \n\t"
+        ".set pop \n\t"
+        :[frh]"=&f"(firstRow.h), [frl]"=&f"(firstRow.l),
+         [prh]"=&f"(previousRow.h), [prl]"=&f"(previousRow.l)
+        :[fr]"r"(intFirstRow + x), [pr]"r"(intPrevRow + x),
+         [r]"r"(intRow + x)
+        :"memory"
+      );
+    }
+  }
+
+  uint64_t tmp;
+  double s44, see;
+  __m128i zero;
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    "li %[tmp], 0xee \n\t"
+    "mtc1 %[tmp], %[see] \n\t"
+    "li %[tmp], 0x44 \n\t"
+    "mtc1 %[tmp], %[s44] \n\t"
+    _mm_xor(zero, zero, zero)
+    ".set pop \n\t"
+    :[tmp]"=&r"(tmp), [s44]"=f"(s44), [see]"=f"(see),
+     [zeroh]"=f"(zero.h), [zerol]"=f"(zero.l)
+  );
+  for (int y = aTopInflation + 1; y < (aSize.height + aTopInflation); y++) {
+    __m128i currentRowSum;
+    uint32_t *intRow = aIntegralImage + (y * stride32bit);
+    uint32_t *intPrevRow = aIntegralImage + (y - 1) * stride32bit;
+    uint8_t *sourceRow = aSource + aSourceStride * (y - aTopInflation);
+    uint32_t pixel = sourceRow[0];
+
+    asm volatile (
+      ".set push \n\t"
+      ".set arch=loongson3a \n\t"
+      _mm_xor(cr, cr, cr)
+      ".set pop \n\t"
+      :[crh]"=f"(currentRowSum.h), [crl]"=f"(currentRowSum.l)
+    );
+    for (int x = 0; x < aLeftInflation; x += 4) {
+      __m128i sumPixels, t;
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        "mtc1 %[pix], %[spl] \n\t"
+        "punpcklwd %[spl], %[spl], %[spl] \n\t"
+        "mov.d %[sph], %[spl] \n\t"
+        "pshufh %[sph], %[spl], %[s44] \n\t"
+        "pshufh %[spl], %[spl], %[s44] \n\t"
+        ".set pop \n\t"
+        :[sph]"=&f"(sumPixels.h), [spl]"=&f"(sumPixels.l)
+        :[pix]"r"(pixel), [s44]"f"(s44)
+      );
+      sumPixels = AccumulatePixelSums(sumPixels);
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        _mm_paddw(sp, sp, cr)
+        "pshufh %[crh], %[sph], %[see] \n\t"
+        "pshufh %[crl], %[sph], %[see] \n\t"
+        "gslqc1 %[th], %[tl], (%[pr]) \n\t"
+        _mm_paddw(t, sp, t)
+        "gssqc1 %[th], %[tl], (%[r]) \n\t"
+        ".set pop \n\t"
+        :[th]"=&f"(t.h), [tl]"=&f"(t.l),
+         [sph]"+f"(sumPixels.h), [spl]"+f"(sumPixels.l),
+         [crh]"+f"(currentRowSum.h), [crl]"+f"(currentRowSum.l)
+        :[r]"r"(intRow + x), [pr]"r"(intPrevRow + x), [see]"f"(see)
+        :"memory"
+      );
+    }
+    for (int x = aLeftInflation; x < (aSize.width + aLeftInflation); x += 4) {
+      uint32_t pixels = *(uint32_t*)(sourceRow + (x - aLeftInflation));
+      __m128i sumPixels, t;
+
+      // It's important to shuffle here. When we exit this loop currentRowSum
+      // has to be set to sumPixels, so that the following loop can get the
+      // correct pixel for the currentRowSum. The highest order pixel in
+      // currentRowSum could've originated from accumulation in the stride.
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        "pshufh %[crl], %[crh], %[see] \n\t"
+        "pshufh %[crh], %[crh], %[see] \n\t"
+        "mtc1 %[pix], %[spl] \n\t"
+        "punpcklwd %[spl], %[spl], %[spl] \n\t"
+        "mov.d %[sph], %[spl] \n\t"
+        _mm_punpcklbh(sp, sp, zero)
+        _mm_punpcklhw(sp, sp, zero)
+        ".set pop \n\t"
+        :[sph]"=&f"(sumPixels.h), [spl]"=&f"(sumPixels.l),
+         [crh]"+f"(currentRowSum.h), [crl]"+f"(currentRowSum.l)
+        :[pix]"r"(pixels), [see]"f"(see),
+         [zeroh]"f"(zero.h), [zerol]"f"(zero.l)
+      );
+      sumPixels = AccumulatePixelSums(sumPixels);
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        _mm_paddw(sp, sp, cr)
+        "mov.d %[crh], %[sph] \n\t"
+        "mov.d %[crl], %[spl] \n\t"
+        "gslqc1 %[th], %[tl], (%[pr]) \n\t"
+        _mm_paddw(t, sp, t)
+        "gssqc1 %[th], %[tl], (%[r]) \n\t"
+        ".set pop \n\t"
+        :[th]"=&f"(t.h), [tl]"=&f"(t.l),
+         [sph]"+f"(sumPixels.h), [spl]"+f"(sumPixels.l),
+         [crh]"+f"(currentRowSum.h), [crl]"+f"(currentRowSum.l)
+        :[r]"r"(intRow + x), [pr]"r"(intPrevRow + x)
+        :"memory"
+      );
+    }
+
+    pixel = sourceRow[aSize.width - 1];
+    int x = (aSize.width + aLeftInflation);
+    if ((aSize.width & 3)) {
+      // Deal with unaligned portion. Get the correct pixel from currentRowSum,
+      // see explanation above.
+      uint32_t intCurrentRowSum = ((uint32_t*)&currentRowSum)[(aSize.width % 4) - 1];
+      for (; x < integralImageSize.width; x++) {
+        // We could be unaligned here!
+        if (!(x & 3)) {
+          // aligned!
+          asm volatile (
+            ".set push \n\t"
+            ".set arch=loongson3a \n\t"
+            "mtc1 %[cr], %[crl] \n\t"
+            "punpcklwd %[crl], %[crl], %[crl] \n\t"
+            "mov.d %[crh], %[crl] \n\t"
+            ".set pop \n\t"
+            :[crh]"=f"(currentRowSum.h), [crl]"=f"(currentRowSum.l)
+            :[cr]"r"(intCurrentRowSum)
+          );
+          break;
+        }
+        intCurrentRowSum += pixel;
+        intRow[x] = intPrevRow[x] + intCurrentRowSum;
+      }
+    } else {
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        "pshufh %[crl], %[crh], %[see] \n\t"
+        "pshufh %[crh], %[crh], %[see] \n\t"
+        ".set pop \n\t"
+        :[crh]"+f"(currentRowSum.h), [crl]"+f"(currentRowSum.l)
+        :[see]"f"(see)
+      );
+    }
+    for (; x < integralImageSize.width; x += 4) {
+      __m128i sumPixels, t;
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        "mtc1 %[pix], %[spl] \n\t"
+        "punpcklwd %[spl], %[spl], %[spl] \n\t"
+        "mov.d %[sph], %[spl] \n\t"
+        ".set pop \n\t"
+        :[sph]"=f"(sumPixels.h), [spl]"=f"(sumPixels.l)
+        :[pix]"r"(pixel)
+      );
+      sumPixels = AccumulatePixelSums(sumPixels);
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        _mm_paddw(sp, sp, cr)
+        "pshufh %[crh], %[sph], %[see] \n\t"
+        "pshufh %[crl], %[sph], %[see] \n\t"
+        "gslqc1 %[th], %[tl], (%[pr]) \n\t"
+        _mm_paddw(t, sp, t)
+        "gssqc1 %[th], %[tl], (%[r]) \n\t"
+        ".set pop \n\t"
+        :[th]"=&f"(t.h), [tl]"=&f"(t.l),
+         [sph]"+f"(sumPixels.h), [spl]"+f"(sumPixels.l),
+         [crh]"+f"(currentRowSum.h), [crl]"+f"(currentRowSum.l)
+        :[r]"r"(intRow + x), [pr]"r"(intPrevRow + x), [see]"f"(see)
+        :"memory"
+      );
+    }
+  }
+
+  if (aBottomInflation) {
+    // Store the last valid row of our source image in the last row of
+    // our integral image. This will be overwritten with the correct values
+    // in the upcoming loop.
+    LoadIntegralRowFromRow(aIntegralImage + (integralImageSize.height - 1) * stride32bit,
+                           aSource + (aSize.height - 1) * aSourceStride, aSize.width, aLeftInflation, aRightInflation);
+
+
+    for (int y = aSize.height + aTopInflation; y < integralImageSize.height; y++) {
+      __m128i *intRow = (__m128i*)(aIntegralImage + (y * stride32bit));
+      __m128i *intPrevRow = (__m128i*)(aIntegralImage + (y - 1) * stride32bit);
+      __m128i *intLastRow = (__m128i*)(aIntegralImage + (integralImageSize.height - 1) * stride32bit);
+
+      for (int x = 0; x < integralImageSize.width; x += 4) {
+        __m128i t1, t2;
+        asm volatile (
+          ".set push \n\t"
+          ".set arch=loongson3a \n\t"
+          "gslqc1 %[t1h], %[t1l], (%[lr]) \n\t"
+          "gslqc1 %[t2h], %[t2l], (%[pr]) \n\t"
+          _mm_paddw(t1, t1, t2)
+          "gssqc1 %[t1h], %[t1l], (%[r]) \n\t"
+          ".set pop \n\t"
+          :[t1h]"=&f"(t1.h), [t1l]"=&f"(t1.l),
+           [t2h]"=&f"(t2.h), [t2l]"=&f"(t2.l)
+          :[r]"r"(intRow + (x / 4)),
+           [lr]"r"(intLastRow + (x / 4)),
+           [pr]"r"(intPrevRow + (x / 4))
+          :"memory"
+      );
+      }
+    }
+  }
+}
+
+/**
+ * Attempt to do an in-place box blur using an integral image.
+ */
+void
+AlphaBoxBlur::BoxBlur_LS3(uint8_t* aData,
+                           int32_t aLeftLobe,
+                           int32_t aRightLobe,
+                           int32_t aTopLobe,
+                           int32_t aBottomLobe,
+                           uint32_t *aIntegralImage,
+                           size_t aIntegralImageStride)
+{
+  IntSize size = GetSize();
+
+  MOZ_ASSERT(size.height > 0);
+
+  // Our 'left' or 'top' lobe will include the current pixel. i.e. when
+  // looking at an integral image the value of a pixel at 'x,y' is calculated
+  // using the value of the integral image values above/below that.
+  aLeftLobe++;
+  aTopLobe++;
+  int32_t boxSize = (aLeftLobe + aRightLobe) * (aTopLobe + aBottomLobe);
+
+  MOZ_ASSERT(boxSize > 0);
+
+  if (boxSize == 1) {
+      return;
+  }
+
+  uint32_t reciprocal = uint32_t((uint64_t(1) << 32) / boxSize);
+
+  uint32_t stride32bit = aIntegralImageStride / 4;
+  int32_t leftInflation = RoundUpToMultipleOf4(aLeftLobe).value();
+
+  GenerateIntegralImage_LS3(leftInflation, aRightLobe, aTopLobe, aBottomLobe,
+                             aIntegralImage, aIntegralImageStride, aData,
+                             mStride, size);
+
+  __m128i divisor, zero;
+  asm volatile (
+    ".set push \n\t"
+    ".set arch=loongson3a \n\t"
+    "mtc1 %[rec], %[divl] \n\t"
+    "punpcklwd %[divl], %[divl], %[divl] \n\t"
+    "mov.d %[divh], %[divl] \n\t"
+    _mm_xor(zero, zero, zero)
+    ".set pop \n\t"
+    :[divh]"=f"(divisor.h), [divl]"=f"(divisor.l),
+     [zeroh]"=f"(zero.h), [zerol]"=f"(zero.l)
+    :[rec]"r"(reciprocal)
+  );
+
+  // This points to the start of the rectangle within the IntegralImage that overlaps
+  // the surface being blurred.
+  uint32_t *innerIntegral = aIntegralImage + (aTopLobe * stride32bit) + leftInflation;
+
+  IntRect skipRect = mSkipRect;
+  int32_t stride = mStride;
+  uint8_t *data = aData;
+  for (int32_t y = 0; y < size.height; y++) {
+    bool inSkipRectY = y > skipRect.y && y < skipRect.YMost();
+
+    uint32_t *topLeftBase = innerIntegral + ((y - aTopLobe) * ptrdiff_t(stride32bit) - aLeftLobe);
+    uint32_t *topRightBase = innerIntegral + ((y - aTopLobe) * ptrdiff_t(stride32bit) + aRightLobe);
+    uint32_t *bottomRightBase = innerIntegral + ((y + aBottomLobe) * ptrdiff_t(stride32bit) + aRightLobe);
+    uint32_t *bottomLeftBase = innerIntegral + ((y + aBottomLobe) * ptrdiff_t(stride32bit) - aLeftLobe);
+
+    int32_t x = 0;
+    // Process 16 pixels at a time for as long as possible.
+    for (; x <= size.width - 16; x += 16) {
+      if (inSkipRectY && x > skipRect.x && x < skipRect.XMost()) {
+        x = skipRect.XMost() - 16;
+        // Trigger early jump on coming loop iterations, this will be reset
+        // next line anyway.
+        inSkipRectY = false;
+        continue;
+      }
+
+      __m128i topLeft;
+      __m128i topRight;
+      __m128i bottomRight;
+      __m128i bottomLeft;
+
+      topLeft = loadUnaligned128((__m128i*)(topLeftBase + x));
+      topRight = loadUnaligned128((__m128i*)(topRightBase + x));
+      bottomRight = loadUnaligned128((__m128i*)(bottomRightBase + x));
+      bottomLeft = loadUnaligned128((__m128i*)(bottomLeftBase + x));
+      __m128i result1 = BlurFourPixels(topLeft, topRight, bottomRight, bottomLeft, divisor);
+
+      topLeft = loadUnaligned128((__m128i*)(topLeftBase + x + 4));
+      topRight = loadUnaligned128((__m128i*)(topRightBase + x + 4));
+      bottomRight = loadUnaligned128((__m128i*)(bottomRightBase + x + 4));
+      bottomLeft = loadUnaligned128((__m128i*)(bottomLeftBase + x + 4));
+      __m128i result2 = BlurFourPixels(topLeft, topRight, bottomRight, bottomLeft, divisor);
+
+      topLeft = loadUnaligned128((__m128i*)(topLeftBase + x + 8));
+      topRight = loadUnaligned128((__m128i*)(topRightBase + x + 8));
+      bottomRight = loadUnaligned128((__m128i*)(bottomRightBase + x + 8));
+      bottomLeft = loadUnaligned128((__m128i*)(bottomLeftBase + x + 8));
+      __m128i result3 = BlurFourPixels(topLeft, topRight, bottomRight, bottomLeft, divisor);
+
+      topLeft = loadUnaligned128((__m128i*)(topLeftBase + x + 12));
+      topRight = loadUnaligned128((__m128i*)(topRightBase + x + 12));
+      bottomRight = loadUnaligned128((__m128i*)(bottomRightBase + x + 12));
+      bottomLeft = loadUnaligned128((__m128i*)(bottomLeftBase + x + 12));
+      __m128i result4 = BlurFourPixels(topLeft, topRight, bottomRight, bottomLeft, divisor);
+
+      double t;
+      __m128i final;
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        _mm_packsswh(r3, r3, r4, t)
+        _mm_packsswh(f, r1, r2, t)
+        _mm_packushb(f, f, r3, t)
+        "gssdlc1 %[fh], 0xf(%[d]) \n\t"
+        "gssdrc1 %[fh], 0x8(%[d]) \n\t"
+        "gssdlc1 %[fl], 0x7(%[d]) \n\t"
+        "gssdrc1 %[fl], 0x0(%[d]) \n\t"
+        ".set pop \n\t"
+        :[fh]"=&f"(final.h), [fl]"=&f"(final.l),
+         [r3h]"+f"(result3.h), [r3l]"+f"(result3.l),
+         [t]"=&f"(t)
+        :[r1h]"f"(result1.h), [r1l]"f"(result1.l),
+         [r2h]"f"(result2.h), [r2l]"f"(result2.l),
+         [r4h]"f"(result4.h), [r4l]"f"(result4.l),
+         [d]"r"(data + stride * y + x)
+        :"memory"
+      );
+    }
+
+    // Process the remaining pixels 4 bytes at a time.
+    for (; x < size.width; x += 4) {
+      if (inSkipRectY && x > skipRect.x && x < skipRect.XMost()) {
+        x = skipRect.XMost() - 4;
+        // Trigger early jump on coming loop iterations, this will be reset
+        // next line anyway.
+        inSkipRectY = false;
+        continue;
+      }
+      __m128i topLeft = loadUnaligned128((__m128i*)(topLeftBase + x));
+      __m128i topRight = loadUnaligned128((__m128i*)(topRightBase + x));
+      __m128i bottomRight = loadUnaligned128((__m128i*)(bottomRightBase + x));
+      __m128i bottomLeft = loadUnaligned128((__m128i*)(bottomLeftBase + x));
+
+      __m128i result = BlurFourPixels(topLeft, topRight, bottomRight, bottomLeft, divisor);
+
+      double t;
+      __m128i final;
+      asm volatile (
+        ".set push \n\t"
+        ".set arch=loongson3a \n\t"
+        _mm_packsswh(f, r, zero, t)
+        _mm_packushb(f, f, zero, t)
+        "swc1 %[fl], (%[d]) \n\t"
+        ".set pop \n\t"
+        :[fh]"=&f"(final.h), [fl]"=&f"(final.l),
+         [t]"=&f"(t)
+        :[d]"r"(data + stride * y + x),
+         [rh]"f"(result.h), [rl]"f"(result.l),
+         [zeroh]"f"(zero.h), [zerol]"f"(zero.l)
+        :"memory"
+      );
+    }
+  }
+
+}
+
+}
+}
+
+#endif /* _MIPS_ARCH_LOONGSON3A */