Remove unused FAST_HEX motion search method

Change-Id: I07c838639e82fba9cd84f37ac4545d8d20d03a6b

av1/encoder/mcomp.c

diff --git a/av1/encoder/mcomp.c b/av1/encoder/mcomp.c
index 480eb55..c745955 100644
--- a/av1/encoder/mcomp.c
+++ b/av1/encoder/mcomp.c
@@ -576,7 +576,7 @@
   cfg->num_search_steps = MAX_PATTERN_SCALES;
 }
 
-// Search site initialization for HEX / FAST_HEX search methods.
+// Search site initialization for HEX search method.
 static void init_motion_compensation_hex(search_site_config *cfg, int stride,
                                          int level) {
   (void)level;
@@ -1262,16 +1262,6 @@
                         cost_list, best_mv, best_mv_stats);
 }
 
-static int fast_hex_search(const FULLPEL_MV start_mv,
-                           const FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
-                           const int search_step, const int do_init_search,
-                           int *cost_list, FULLPEL_MV *best_mv,
-                           FULLPEL_MV_STATS *best_mv_stats) {
-  return hex_search(start_mv, ms_params,
-                    AOMMAX(MAX_MVSEARCH_STEPS - 2, search_step), do_init_search,
-                    cost_list, best_mv, best_mv_stats);
-}
-
 static int vfast_dia_search(const FULLPEL_MV start_mv,
                             const FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
                             const int search_step, const int do_init_search,
@@ -1815,15 +1805,10 @@
       var = fast_dia_search(start_mv, ms_params, step_param, 0, cost_list,
                             best_mv, best_mv_stats);
       break;
-    case FAST_HEX:
-      var = fast_hex_search(start_mv, ms_params, step_param, 0, cost_list,
-                            best_mv, best_mv_stats);
-      break;
     case HEX:
       var = hex_search(start_mv, ms_params, step_param, 1, cost_list, best_mv,
                        best_mv_stats);
       break;
-
     case BIGDIA:
       var = bigdia_search(start_mv, ms_params, step_param, 1, cost_list,
                           best_mv, best_mv_stats);

av1/encoder/mcomp.h

diff --git a/av1/encoder/mcomp.h b/av1/encoder/mcomp.h
index 5747de0..53f1aae 100644
--- a/av1/encoder/mcomp.h
+++ b/av1/encoder/mcomp.h
@@ -172,7 +172,6 @@
   CLAMPED_DIAMOND,  // CLAMPED_DIAMOND
   HEX,              // HEX
   BIGDIA,           // BIGDIA
-  HEX,              // FAST_HEX
   BIGDIA,           // FAST_DIAMOND
   BIGDIA,           // FAST_BIGDIA
   BIGDIA            // VFAST_DIAMOND

av1/encoder/mcomp_structs.h

diff --git a/av1/encoder/mcomp_structs.h b/av1/encoder/mcomp_structs.h
index 9bb03b0..28cc2c7 100644
--- a/av1/encoder/mcomp_structs.h
+++ b/av1/encoder/mcomp_structs.h
@@ -72,14 +72,12 @@
   // up to 11 search stages. First stage consists of 4 search
   // points and the rest with 8 search points each.
   BIGDIA = 5,
-  // HEX search with up to 2 stages.
-  FAST_HEX = 6,
   // BIGDIA search with up to 2 stages.
-  FAST_DIAMOND = 7,
+  FAST_DIAMOND = 6,
   // BIGDIA search with up to 3 stages.
-  FAST_BIGDIA = 8,
+  FAST_BIGDIA = 7,
   // BIGDIA search with up to 1 stage.
-  VFAST_DIAMOND = 9,
+  VFAST_DIAMOND = 8,
   // Total number of search methods.
   NUM_SEARCH_METHODS,
   // Number of distinct search methods.

av1/encoder/motion_search_facade.h

diff --git a/av1/encoder/motion_search_facade.h b/av1/encoder/motion_search_facade.h
index 87a18cb..402fdf1 100644
--- a/av1/encoder/motion_search_facade.h
+++ b/av1/encoder/motion_search_facade.h
@@ -99,16 +99,15 @@
   //  1. NSTEP
   //  2. DIAMOND
   //  3. BIGDIA
-  //  4. HEX.
-  //  5. FAST_HEX \approx FAST_DIAMOND
+  //  4. HEX
+  //  5. FAST_DIAMOND
   switch (search_method) {
     case NSTEP: return DIAMOND;
     case NSTEP_8PT: return DIAMOND;
     case DIAMOND: return BIGDIA;
     case CLAMPED_DIAMOND: return BIGDIA;
     case BIGDIA: return HEX;
-    case HEX: return FAST_HEX;
-    case FAST_HEX: return FAST_HEX;
+    case HEX: return FAST_DIAMOND;
     case FAST_DIAMOND: return VFAST_DIAMOND;
     case FAST_BIGDIA: return FAST_BIGDIA;
     case VFAST_DIAMOND: return VFAST_DIAMOND;