Move subpixel variance function from common/ to encoder/.

This seems to only be used in the encoder. Also remove an empty wrapper
file that contained forward declarations for this function, but didn't
actually define any actual functions.

Change-Id: Ifc561eef7ebe374a7d03698055e51e105f6d614b

vp9/common/x86/vp9_subpixel_variance_sse2.c

@@ -1,45 +0,0 @@
-/*
- *  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);

vp9/vp9_common.mk

@@ -87,8 +87,6 @@ VP9_COMMON_SRCS-$(HAVE_SSE2) += common/x86/vp9_iwalsh_sse2.asm
 VP9_COMMON_SRCS-$(HAVE_SSE2) += common/x86/vp9_loopfilter_sse2.asm
 VP9_COMMON_SRCS-$(HAVE_SSE2) += common/x86/vp9_recon_sse2.asm
 VP9_COMMON_SRCS-$(HAVE_SSE2) += common/x86/vp9_recon_wrapper_sse2.c
-VP9_COMMON_SRCS-$(HAVE_SSE2) += common/x86/vp9_subpel_variance_impl_sse2.asm
-VP9_COMMON_SRCS-$(HAVE_SSE2) += common/x86/vp9_subpixel_variance_sse2.c
 VP9_COMMON_SRCS-$(HAVE_SSSE3) += common/x86/vp9_subpixel_8t_ssse3.asm
 ifeq ($(CONFIG_POSTPROC),yes)
 VP9_COMMON_SRCS-$(HAVE_MMX) += common/x86/vp9_postproc_mmx.asm

vp9/vp9cx.mk

@@ -86,6 +86,7 @@ VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_sad_sse2.asm
 VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_sad4d_sse2.asm
 VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_fwalsh_sse2.asm
 VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_subtract_sse2.asm
+VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_subpel_variance_impl_sse2.asm
 VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_temporal_filter_apply_sse2.asm
 VP9_CX_SRCS-$(HAVE_SSE3) += encoder/x86/vp9_sad_sse3.asm
 VP9_CX_SRCS-$(HAVE_SSSE3) += encoder/x86/vp9_sad_ssse3.asm