libvpx: Pull from upstream

source/libvpx/vp9/common/x86/vp9_subpixel_variance_sse2.c

+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#define HALFNDX 8
+
+void vp9_half_horiz_variance16x_h_sse2(const unsigned char *ref_ptr,
+                                       int ref_pixels_per_line,
+                                       const unsigned char *src_ptr,
+                                       int src_pixels_per_line,
+                                       unsigned int Height,
+                                       int *sum,
+                                       unsigned int *sumsquared);
+
+void vp9_half_vert_variance16x_h_sse2(const unsigned char *ref_ptr,
+                                      int ref_pixels_per_line,
+                                      const unsigned char *src_ptr,
+                                      int src_pixels_per_line,
+                                      unsigned int Height,
+                                      int *sum,
+                                      unsigned int *sumsquared);
+
+void vp9_half_horiz_vert_variance16x_h_sse2(const unsigned char *ref_ptr,
+                                            int ref_pixels_per_line,
+                                            const unsigned char *src_ptr,
+                                            int src_pixels_per_line,
+                                            unsigned int Height,
+                                            int *sum,
+                                            unsigned int *sumsquared);
+
+void vp9_filter_block2d_bil_var_sse2(const unsigned char *ref_ptr,
+                                     int ref_pixels_per_line,
+                                     const unsigned char *src_ptr,
+                                     int src_pixels_per_line,
+                                     unsigned int Height,
+                                     int  xoffset,
+                                     int  yoffset,
+                                     int *sum,
+                                     unsigned int *sumsquared);
+
+unsigned int vp9_sub_pixel_variance16x2_sse2(const unsigned char  *src_ptr,
+                                             int  src_pixels_per_line,
+                                             int  xoffset,
+                                             int  yoffset,
+                                             const unsigned char *dst_ptr,
+                                             int dst_pixels_per_line,
+                                             unsigned int *sse) {
+  int xsum0, xsum1;
+  unsigned int xxsum0, xxsum1;
+
+  if (xoffset == HALFNDX && yoffset == 0) {
+    vp9_half_horiz_variance16x_h_sse2(
+      src_ptr, src_pixels_per_line,
+      dst_ptr, dst_pixels_per_line, 2,
+      &xsum0, &xxsum0);
+  } else if (xoffset == 0 && yoffset == HALFNDX) {
+    vp9_half_vert_variance16x_h_sse2(
+      src_ptr, src_pixels_per_line,
+      dst_ptr, dst_pixels_per_line, 2,
+      &xsum0, &xxsum0);
+  } else if (xoffset == HALFNDX && yoffset == HALFNDX) {
+    vp9_half_horiz_vert_variance16x_h_sse2(
+      src_ptr, src_pixels_per_line,
+      dst_ptr, dst_pixels_per_line, 2,
+      &xsum0, &xxsum0);
+  } else {
+    vp9_filter_block2d_bil_var_sse2(
+      src_ptr, src_pixels_per_line,
+      dst_ptr, dst_pixels_per_line, 2,
+      xoffset, yoffset,
+      &xsum0, &xxsum0);
+
+    vp9_filter_block2d_bil_var_sse2(
+      src_ptr + 8, src_pixels_per_line,
+      dst_ptr + 8, dst_pixels_per_line, 2,
+      xoffset, yoffset,
+      &xsum1, &xxsum1);
+    xsum0 += xsum1;
+    xxsum0 += xxsum1;
+  }
+
+  *sse = xxsum0;
+  return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 5));
+}