[AArch64] Fix selection of default CPU options at configure-time

	* config.gcc (aarch64*-*-*): Use ISA flags from aarch64-arches.def.
	Do not define target_cpu_default2 to generic.
	* config/aarch64/aarch64.h (TARGET_CPU_DEFAULT): Use generic cpu.
	* config/aarch64/aarch64.c (aarch64_override_options): Update comment.
	* config/aarch64/aarch64-arches.def (armv8-a): Use generic cpu.

From-SVN: r208508

gcc/ChangeLog

+2014-03-12  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* config.gcc (aarch64*-*-*): Use ISA flags from aarch64-arches.def.
+	Do not define target_cpu_default2 to generic.
+	* config/aarch64/aarch64.h (TARGET_CPU_DEFAULT): Use generic cpu.
+	* config/aarch64/aarch64.c (aarch64_override_options): Update comment.
+	* config/aarch64/aarch64-arches.def (armv8-a): Use generic cpu.
+
 2014-03-12  Jakub Jelinek  <jakub@redhat.com>
 	    Marc Glisse  <marc.glisse@inria.fr>
 

gcc/config.gcc

@@ -3396,6 +3396,11 @@ case "${target}" in
 				  ${srcdir}/config/aarch64/$def | \
 				  sed -e 's/^[^,]*,[ 	]*//' | \
 				  sed -e 's/,.*$//'`
+				# Extract the architecture flags from aarch64-arches.def
+				ext_mask=`grep "^$pattern(\"$base_val\"," \
+				   ${srcdir}/config/aarch64/$def | \
+				   sed -e 's/)$//' | \
+				   sed -e 's/^.*,//'`
 			  else
 				base_id=`grep "^$pattern(\"$base_val\"," \
 				  ${srcdir}/config/aarch64/$def | \
@@ -4057,10 +4062,8 @@ esac
 target_cpu_default2=
 case ${target} in
 	aarch64*-*-*)
-		if test x$target_cpu_cname = x
+		if test x"$target_cpu_cname" != x
 		then
-			target_cpu_default2=TARGET_CPU_generic
-		else
 			target_cpu_default2=$target_cpu_cname
 		fi
 		;;

gcc/config/aarch64/aarch64-arches.def

@@ -26,4 +26,4 @@
    this architecture.  ARCH is the architecture revision.  FLAGS are
    the flags implied by the architecture.  */
 
-AARCH64_ARCH("armv8-a",	      cortexa53,	     8,  AARCH64_FL_FOR_ARCH8)
+AARCH64_ARCH("armv8-a",	      generic,	     8,  AARCH64_FL_FOR_ARCH8)

gcc/config/aarch64/aarch64.c

@@ -5250,7 +5250,7 @@ aarch64_override_options (void)
 
   /* If the user did not specify a processor, choose the default
      one for them.  This will be the CPU set during configuration using
-     --with-cpu, otherwise it is "cortex-a53".  */
+     --with-cpu, otherwise it is "generic".  */
   if (!selected_cpu)
     {
       selected_cpu = &all_cores[TARGET_CPU_DEFAULT & 0x3f];

gcc/config/aarch64/aarch64.h

@@ -475,10 +475,10 @@ enum target_cpus
   TARGET_CPU_generic
 };
 
-/* If there is no CPU defined at configure, use "cortex-a53" as default.  */
+/* If there is no CPU defined at configure, use generic as default.  */
 #ifndef TARGET_CPU_DEFAULT
 #define TARGET_CPU_DEFAULT \
-  (TARGET_CPU_cortexa53 | (AARCH64_CPU_DEFAULT_FLAGS << 6))
+  (TARGET_CPU_generic | (AARCH64_CPU_DEFAULT_FLAGS << 6))
 #endif
 
 /* The processor for which instructions should be scheduled.  */