[AArch64] Use selected cpu's tuning when no tuning parameter is specified

gcc/

2014-12-05  Renlin Li  <renlin.li@arm.com>

	* config/aarch64/aarch64.c (aarch64_parse_cpu): Don't define
	selected_tune.
	(aarch64_override_options): Use selected_cpu's tuning.

From-SVN: r218425

gcc/ChangeLog

+2014-12-05  Renlin Li  <renlin.li@arm.com>
+
+	* config/aarch64/aarch64.c (aarch64_parse_cpu): Don't define
+	selected_tune.
+	(aarch64_override_options): Use selected_cpu's tuning.
+
 2014-12-05  David Edelsohn  <dje.gcc@gmail.com>
 
 	* config/rs6000/xcoff.h (ASM_OUTPUT_ALIGNED_LOCAL): Append

gcc/config/aarch64/aarch64.c

@@ -6625,7 +6625,6 @@ aarch64_parse_cpu (void)
       if (strlen (cpu->name) == len && strncmp (cpu->name, str, len) == 0)
 	{
 	  selected_cpu = cpu;
-	  selected_tune = cpu;
 	  aarch64_isa_flags = selected_cpu->flags;
 
 	  if (ext != NULL)
@@ -6721,9 +6720,8 @@ aarch64_override_options (void)
 
   gcc_assert (selected_cpu);
 
-  /* The selected cpu may be an architecture, so lookup tuning by core ID.  */
   if (!selected_tune)
-    selected_tune = &all_cores[selected_cpu->core];
+    selected_tune = selected_cpu;
 
   aarch64_tune_flags = selected_tune->flags;
   aarch64_tune = selected_tune->core;