libvpx: Pull from upstream

source/libvpx/vpx_dsp/x86/variance_avx2.c

Index: source/libvpx/vpx_dsp/x86/variance_avx2.c
diff --git a/source/libvpx/vpx_dsp/x86/variance_avx2.c b/source/libvpx/vpx_dsp/x86/variance_avx2.c
new file mode 100644
index 0000000000000000000000000000000000000000..82cef4af0afa69015c0bb62f5bf4fa2fc86d65f4
--- /dev/null
+++ b/source/libvpx/vpx_dsp/x86/variance_avx2.c
@@ -0,0 +1,93 @@
+/*
+ *  Copyright (c) 2012 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.
+ */
+#include "./vpx_dsp_rtcd.h"
+
+typedef void (*get_var_avx2)(const uint8_t *src, int src_stride,
+                             const uint8_t *ref, int ref_stride,
+                             unsigned int *sse, int *sum);
+
+void vpx_get32x32var_avx2(const uint8_t *src, int src_stride,
+                          const uint8_t *ref, int ref_stride,
+                          unsigned int *sse, int *sum);
+
+static void variance_avx2(const uint8_t *src, int src_stride,
+                          const uint8_t *ref, int  ref_stride,
+                          int w, int h, unsigned int *sse, int *sum,
+                          get_var_avx2 var_fn, int block_size) {
+  int i, j;
+
+  *sse = 0;
+  *sum = 0;
+
+  for (i = 0; i < h; i += 16) {
+    for (j = 0; j < w; j += block_size) {
+      unsigned int sse0;
+      int sum0;
+      var_fn(&src[src_stride * i + j], src_stride,
+             &ref[ref_stride * i + j], ref_stride, &sse0, &sum0);
+      *sse += sse0;
+      *sum += sum0;
+    }
+  }
+}
+
+
+unsigned int vpx_variance16x16_avx2(const uint8_t *src, int src_stride,
+                                    const uint8_t *ref, int ref_stride,
+                                    unsigned int *sse) {
+  int sum;
+  variance_avx2(src, src_stride, ref, ref_stride, 16, 16,
+                sse, &sum, vpx_get16x16var_avx2, 16);
+  return *sse - (((unsigned int)sum * sum) >> 8);
+}
+
+unsigned int vpx_mse16x16_avx2(const uint8_t *src, int src_stride,
+                               const uint8_t *ref, int ref_stride,
+                               unsigned int *sse) {
+  int sum;
+  vpx_get16x16var_avx2(src, src_stride, ref, ref_stride, sse, &sum);
+  return *sse;
+}
+
+unsigned int vpx_variance32x16_avx2(const uint8_t *src, int src_stride,
+                                    const uint8_t *ref, int ref_stride,
+                                    unsigned int *sse) {
+  int sum;
+  variance_avx2(src, src_stride, ref, ref_stride, 32, 16,
+                sse, &sum, vpx_get32x32var_avx2, 32);
+  return *sse - (((int64_t)sum * sum) >> 9);
+}
+
+unsigned int vpx_variance32x32_avx2(const uint8_t *src, int src_stride,
+                                    const uint8_t *ref, int ref_stride,
+                                    unsigned int *sse) {
+  int sum;
+  variance_avx2(src, src_stride, ref, ref_stride, 32, 32,
+                sse, &sum, vpx_get32x32var_avx2, 32);
+  return *sse - (((int64_t)sum * sum) >> 10);
+}
+
+unsigned int vpx_variance64x64_avx2(const uint8_t *src, int src_stride,
+                                    const uint8_t *ref, int ref_stride,
+                                    unsigned int *sse) {
+  int sum;
+  variance_avx2(src, src_stride, ref, ref_stride, 64, 64,
+                sse, &sum, vpx_get32x32var_avx2, 32);
+  return *sse - (((int64_t)sum * sum) >> 12);
+}
+
+unsigned int vpx_variance64x32_avx2(const uint8_t *src, int src_stride,
+                                    const uint8_t *ref, int ref_stride,
+                                    unsigned int *sse) {
+  int sum;
+  variance_avx2(src, src_stride, ref, ref_stride, 64, 32,
+                sse, &sum, vpx_get32x32var_avx2, 32);
+  return *sse - (((int64_t)sum * sum) >> 11);
+}