[arm] Eliminate SUBTARGET_CPU_DEFAULT

	* config.gcc (arm-wrs-vxworks): Set target_cpu_cname.
	(arm*-freebsd*): Likewise.
	(arm*-*-netbsdelf*): Likewise.
	(arm*-*-linux*): Likewise.
	(arm*-*-uclinux*eabi*): Likewise.
	(arm*-*-phoenix*): Likewise.
	(arm*-*-eabi*, arm*-*-symbianelf*, arm*-*-rtems*): Likewise.
	(arm*-*-*): Don't clobber target_cpu_cname when --with-cpu is not
	specified.  Default to arm6 if target_cpu_cname is not set.
	* arm/arm.c (arm_option_override): Simplify logic.  Assert that the
	default cpu has been correctly configured.
	* arm/arm.h (TARGET_CPU_DEFAULT): Delete.
	(target_cpus): Delete TARGET_CPU_generic, add TARGET_CPU_num_cores.
	* arm/freebsd.h (SUBTARGET_CPU_DEFAULT): Delete.
	* arm/linux-eabi.h (SUBTARGET_CPU_DEFAULT): Delete.
	* arm/linux-elf.h (SUBTARGET_CPU_DEFAULT): Delete.
	* arm/symbian.h (SUBTARGET_CPU_DEFAULT): Delete.
	* arm/unknown-elf.h (SUBTARGET_CPU_DEFAULT): Delete.

From-SVN: r241827

gcc/ChangeLog

+2016-11-03  Richard Earnshaw  <rearnsha@arm.com>
+
+	* config.gcc (arm-wrs-vxworks): Set target_cpu_cname.
+	(arm*-freebsd*): Likewise.
+	(arm*-*-netbsdelf*): Likewise.
+	(arm*-*-linux*): Likewise.
+	(arm*-*-uclinux*eabi*): Likewise.
+	(arm*-*-phoenix*): Likewise.
+	(arm*-*-eabi*, arm*-*-symbianelf*, arm*-*-rtems*): Likewise.
+	(arm*-*-*): Don't clobber target_cpu_cname when --with-cpu is not
+	specified.  Default to arm6 if target_cpu_cname is not set.
+	* arm/arm.c (arm_option_override): Simplify logic.  Assert that the
+	default cpu has been correctly configured.
+	* arm/arm.h (TARGET_CPU_DEFAULT): Delete.
+	(target_cpus): Delete TARGET_CPU_generic, add TARGET_CPU_num_cores.
+	* arm/freebsd.h (SUBTARGET_CPU_DEFAULT): Delete.
+	* arm/linux-eabi.h (SUBTARGET_CPU_DEFAULT): Delete.
+	* arm/linux-elf.h (SUBTARGET_CPU_DEFAULT): Delete.
+	* arm/symbian.h (SUBTARGET_CPU_DEFAULT): Delete.
+	* arm/unknown-elf.h (SUBTARGET_CPU_DEFAULT): Delete.
+
 2016-11-03  Jiong Wang  <jiong.wang@arm.com>
 
 	* reg-notes.def (CFA_VAL_EXPRESSION): New entry.

gcc/config/arm/arm.c

@@ -3104,17 +3104,7 @@ arm_option_override (void)
       arm_feature_set sought = ARM_FSET_EMPTY;;
 
       arm_selected_cpu = &all_cores[TARGET_CPU_DEFAULT];
-      if (!arm_selected_cpu->name)
-	{
-#ifdef SUBTARGET_CPU_DEFAULT
-	  /* Use the subtarget default CPU if none was specified by
-	     configure.  */
-	  arm_selected_cpu = &all_cores[SUBTARGET_CPU_DEFAULT];
-#endif
-	  /* Default to ARM6.  */
-	  if (!arm_selected_cpu->name)
-	    arm_selected_cpu = &all_cores[arm6];
-	}
+      gcc_assert (arm_selected_cpu->name);
 
       sel = arm_selected_cpu;
       insn_flags = sel->flags;

gcc/config/arm/arm.h

@@ -55,7 +55,8 @@ enum target_cpus
   TARGET_CPU_##INTERNAL_IDENT,
 #include "arm-cores.def"
 #undef ARM_CORE
-  TARGET_CPU_generic
+  /* Total number of CPUs we handle.  */
+  TARGET_CPU_num_cores
 };
 
 /* The processor for which instructions should be scheduled.  */
@@ -83,12 +84,6 @@ extern GTY(()) rtx arm_target_insn;
 /* Callback to output language specific object attributes.  */
 extern void (*arm_lang_output_object_attributes_hook)(void);
 
-/* Just in case configure has failed to define anything.  */
-#ifndef TARGET_CPU_DEFAULT
-#define TARGET_CPU_DEFAULT TARGET_CPU_generic
-#endif
-
-
 #undef  CPP_SPEC
 #define CPP_SPEC "%(subtarget_cpp_spec)					\
 %{mfloat-abi=soft:%{mfloat-abi=hard:					\

gcc/config/arm/freebsd.h

@@ -112,14 +112,6 @@
 #undef  WCHAR_TYPE_SIZE
 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 
-#if defined (TARGET_FREEBSD_ARMv6)
-#undef  SUBTARGET_CPU_DEFAULT
-#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm1176jzs
-#else
-#undef  SUBTARGET_CPU_DEFAULT
-#define SUBTARGET_CPU_DEFAULT   TARGET_CPU_arm9
-#endif
-
 /* FreeBSD 10 does not support unaligned access for armv6 and up.
    Unaligned access support was added in FreeBSD 11.  */
 #if FBSD_MAJOR < 11

gcc/config/arm/linux-eabi.h

@@ -41,12 +41,6 @@
 #undef  ARM_DEFAULT_ABI
 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS_LINUX
 
-/* Default to armv5t so that thumb shared libraries work.
-   The ARM10TDMI core is the default for armv5t, so set
-   SUBTARGET_CPU_DEFAULT to achieve this.  */
-#undef  SUBTARGET_CPU_DEFAULT
-#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm10tdmi
-
 /* TARGET_BIG_ENDIAN_DEFAULT is set in
    config.gcc for big endian configurations.  */
 #undef  TARGET_LINKER_EMULATION

gcc/config/arm/linux-elf.h

@@ -45,8 +45,6 @@
 #undef  TARGET_DEFAULT
 #define TARGET_DEFAULT (TARGET_ENDIAN_DEFAULT)
 
-#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
-
 #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
 
 /* We do not have any MULTILIB_OPTIONS specified, so there are no

gcc/config/arm/symbian.h

@@ -59,12 +59,6 @@
 /* Support the "dllimport" attribute.  */
 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
 
-/* Symbian OS assumes ARM V5 or above.  Since -march=armv5 is
-   equivalent to making the ARM 10TDMI core the default, we can set
-   SUBTARGET_CPU_DEFAULT and get an equivalent effect.  */
-#undef SUBTARGET_CPU_DEFAULT
-#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm10tdmi
-
 /* The assembler should assume VFP FPU format, and armv5t.  */
 #undef SUBTARGET_ASM_FLOAT_SPEC
 #define SUBTARGET_ASM_FLOAT_SPEC \

gcc/config/arm/unknown-elf.h

@@ -88,10 +88,6 @@
     }									\
   while (0)
 
-#ifndef SUBTARGET_CPU_DEFAULT
-#define SUBTARGET_CPU_DEFAULT 		TARGET_CPU_arm7tdmi
-#endif
-
 /* The libgcc udivmod functions may throw exceptions.  If newlib is
    configured to support long longs in I/O, then printf will depend on
    udivmoddi4, which will depend on the exception unwind routines,