[ARC] Disable compact casesi patterns for arcv2

gcc/
2016-05-09  Claudiu Zissulescu  <claziss@synopsys.com>

	* common/config/arc/arc-common.c (arc_option_optimization_table):
	Remove compact casesi option.
	* config/arc/arc.c (arc_override_options): Use compact casesi
	option only for pre-ARCv2 cores.
	* doc/invoke.texi (mcompact-casesi): Update text.

From-SVN: r240916

gcc/ChangeLog

+2016-10-10  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* common/config/arc/arc-common.c (arc_option_optimization_table):
+	Remove compact casesi option.
+	* config/arc/arc.c (arc_override_options): Use compact casesi
+	option only for pre-ARCv2 cores.
+	* doc/invoke.texi (mcompact-casesi): Update text.
+
 2016-10-09  Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000.h (TARGET_EFFICIENT_OVERLAPPING_UNALIGNED): 

gcc/common/config/arc/arc-common.c

@@ -56,7 +56,6 @@ static const struct default_options arc_option_optimization_table[] =
     { OPT_LEVELS_ALL, OPT_mbbit_peephole, NULL, 1 },
     { OPT_LEVELS_SIZE, OPT_mq_class, NULL, 1 },
     { OPT_LEVELS_SIZE, OPT_mcase_vector_pcrel, NULL, 1 },
-    { OPT_LEVELS_SIZE, OPT_mcompact_casesi, NULL, 1 },
     { OPT_LEVELS_NONE, 0, NULL, 0 }
   };
 

gcc/config/arc/arc.c

@@ -858,6 +858,17 @@ arc_override_options (void)
   if (arc_size_opt_level == 3)
     optimize_size = 1;
 
+  /* Compact casesi is not a valid option for ARCv2 family.  */
+  if (TARGET_V2
+      && TARGET_COMPACT_CASESI)
+    {
+      warning (0, "compact-casesi is not applicable to ARCv2");
+      TARGET_COMPACT_CASESI = 0;
+    }
+  else if (optimize_size == 1
+	   && !global_options_set.x_TARGET_COMPACT_CASESI)
+    TARGET_COMPACT_CASESI = 1;
+
   if (flag_pic)
     target_flags |= MASK_NO_SDATA_SET;
 

gcc/doc/invoke.texi

@@ -14293,8 +14293,8 @@ This is the default for @option{-Os}.
 
 @item -mcompact-casesi
 @opindex mcompact-casesi
-Enable compact casesi pattern.
-This is the default for @option{-Os}.
+Enable compact casesi pattern.  This is the default for @option{-Os},
+and only available for ARCv1 cores.
 
 @item -mno-cond-exec
 @opindex mno-cond-exec