Remove enable_6tap filter experiment.

Clean out code under CONFIG_ENABLE_6TAP flag.

Change-Id: Ic45b624081181027d6ba24d55dd644c3197f9830

configure

diff --git a/configure b/configure
index 1d8d895..945a681 100755
--- a/configure
+++ b/configure
@@ -241,7 +241,6 @@
     csm
     implicit_segmentation
     comp_interintra_pred
-    enable_6tap
     modelcoefprob
     loop_dering
     scatterscan

vp9/common/vp9_blockd.h

diff --git a/vp9/common/vp9_blockd.h b/vp9/common/vp9_blockd.h
index b18a4aa..a219935 100644
--- a/vp9/common/vp9_blockd.h
+++ b/vp9/common/vp9_blockd.h
@@ -62,9 +62,6 @@
 } FRAME_TYPE;
 
 typedef enum {
-#if CONFIG_ENABLE_6TAP
-  SIXTAP,
-#endif
   EIGHTTAP_SMOOTH,
   EIGHTTAP,
   EIGHTTAP_SHARP,

vp9/common/vp9_entropymode.c

diff --git a/vp9/common/vp9_entropymode.c b/vp9/common/vp9_entropymode.c
index f3fead6..503ad95 100644
--- a/vp9/common/vp9_entropymode.c
+++ b/vp9/common/vp9_entropymode.c
@@ -304,15 +304,9 @@
   -1, -2
 };
 struct vp9_token vp9_switchable_interp_encodings[VP9_SWITCHABLE_FILTERS];
-#if CONFIG_ENABLE_6TAP
-const INTERPOLATIONFILTERTYPE vp9_switchable_interp[VP9_SWITCHABLE_FILTERS] = {
-  SIXTAP, EIGHTTAP, EIGHTTAP_SHARP};
-const int vp9_switchable_interp_map[SWITCHABLE+1] = {0, -1, 1, 2, -1, -1};
-#else
 const INTERPOLATIONFILTERTYPE vp9_switchable_interp[VP9_SWITCHABLE_FILTERS] = {
   EIGHTTAP, EIGHTTAP_SMOOTH, EIGHTTAP_SHARP};
 const int vp9_switchable_interp_map[SWITCHABLE+1] = {1, 0, 2, -1, -1};
-#endif
 const vp9_prob vp9_switchable_interp_prob [VP9_SWITCHABLE_FILTERS+1]
                                           [VP9_SWITCHABLE_FILTERS-1] = {
   {248, 192}, { 32, 248}, { 32,  32}, {192, 160}
@@ -330,20 +324,12 @@
 };
 const INTERPOLATIONFILTERTYPE vp9_switchable_interp[VP9_SWITCHABLE_FILTERS] = {
   EIGHTTAP, EIGHTTAP_SHARP};
-#if CONFIG_ENABLE_6TAP
-const int vp9_switchable_interp_map[SWITCHABLE+1] = {-1, -1, 0, 1, -1, -1};
-#else
 const int vp9_switchable_interp_map[SWITCHABLE+1] = {-1, 0, 1, -1, -1};
-#endif
 #endif  // VP9_SWITCHABLE_FILTERS
 
 // Indicates if the filter is interpolating or non-interpolating
 // Note currently only the EIGHTTAP_SMOOTH is non-interpolating
-#if CONFIG_ENABLE_6TAP
-const int vp9_is_interpolating_filter[SWITCHABLE + 1] = {1, 0, 1, 1, 1, -1};
-#else
 const int vp9_is_interpolating_filter[SWITCHABLE + 1] = {0, 1, 1, 1, -1};
-#endif
 
 void vp9_entropy_mode_init() {
   vp9_tokens_from_tree(vp9_kf_bmode_encodings,   vp9_kf_bmode_tree);

vp9/common/vp9_reconinter.c

diff --git a/vp9/common/vp9_reconinter.c b/vp9/common/vp9_reconinter.c
index e39e050..14642f2 100644
--- a/vp9/common/vp9_reconinter.c
+++ b/vp9/common/vp9_reconinter.c
@@ -125,11 +125,6 @@
     case BILINEAR:
       xd->subpix.filter_x = xd->subpix.filter_y = vp9_bilinear_filters;
       break;
-#if CONFIG_ENABLE_6TAP
-    case SIXTAP:
-      xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_6;
-      break;
-#endif
   }
   assert(((intptr_t)xd->subpix.filter_x & 0xff) == 0);
 }

vp9/encoder/vp9_onyx_if.c

diff --git a/vp9/encoder/vp9_onyx_if.c b/vp9/encoder/vp9_onyx_if.c
index a47758b..09a0fab 100644
--- a/vp9/encoder/vp9_onyx_if.c
+++ b/vp9/encoder/vp9_onyx_if.c
@@ -2624,11 +2624,7 @@
 
   /* list of filters to search over */
   int mcomp_filters_to_search[] = {
-#if CONFIG_ENABLE_6TAP
-      EIGHTTAP, EIGHTTAP_SHARP, SIXTAP, SWITCHABLE
-#else
-      EIGHTTAP, EIGHTTAP_SHARP, EIGHTTAP_SMOOTH, SWITCHABLE
-#endif
+    EIGHTTAP, EIGHTTAP_SHARP, EIGHTTAP_SMOOTH, SWITCHABLE
   };
   int mcomp_filters = sizeof(mcomp_filters_to_search) /
       sizeof(*mcomp_filters_to_search);