rs6000: Split rs6000_cpu

This splits rs6000_cpu into rs6000_cpu and rs6000_tune.  Both are still
initialised identically, so there is no behaviour change.

Now rs6000_cpu should be set by -mcpu=, and rs6000_tune by -mtune= (but
both still are set by -mtune=, fixed in a later patch in the series).

Also change rs6000_cpu to rs6000_tune in the appropriate cases (i.e.
most, but not those that enable using new insns).


	* config/rs6000/rs6000.opt (rs6000_tune): New variable.
	* config/rs6000/rs6000.c (rs6000_option_override_internal): Also set
	rs6000_tune.  Use rs6000_tune instead of rs6000_cpu where appropriate.
	(rs6000_loop_align): Use rs6000_tune instead of rs6000_cpu where
	appropriate.
	(rs6000_reassociation_width): Ditto.
	(rs6000_emit_epilogue): Ditto.
	(rs6000_adjust_cost): Ditto.
	(is_microcoded_insn): Ditto.
	(is_cracked_insn): Ditto.
	(rs6000_adjust_priority): Ditto.
	(rs6000_sched_reorder): Ditto.
	(rs6000_sched_reorder2): Ditto.
	(insn_must_be_first_in_group): Ditto.
	(insn_must_be_last_in_group): Ditto.
	(rs6000_register_move_cost): Ditto.
	* config/rs6000/rs6000.h (rs6000_cpu_attr): Use rs6000_tune instead of
	rs6000_cpu.

From-SVN: r255462

gcc/ChangeLog

+2017-12-07  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.opt (rs6000_tune): New variable.
+	* config/rs6000/rs6000.c (rs6000_option_override_internal): Also set
+	rs6000_tune.  Use rs6000_tune instead of rs6000_cpu where appropriate.
+	(rs6000_loop_align): Use rs6000_tune instead of rs6000_cpu where
+	appropriate.
+	(rs6000_reassociation_width): Ditto.
+	(rs6000_emit_epilogue): Ditto.
+	(rs6000_adjust_cost): Ditto.
+	(is_microcoded_insn): Ditto.
+	(is_cracked_insn): Ditto.
+	(rs6000_adjust_priority): Ditto.
+	(rs6000_sched_reorder): Ditto.
+	(rs6000_sched_reorder2): Ditto.
+	(insn_must_be_first_in_group): Ditto.
+	(insn_must_be_last_in_group): Ditto.
+	(rs6000_register_move_cost): Ditto.
+	* config/rs6000/rs6000.h (rs6000_cpu_attr): Use rs6000_tune instead of
+	rs6000_cpu.
+
 2017-12-07  Julia Koval  <julia.koval@intel.com>
 
 	* config.gcc: Add vaesintrin.h.

gcc/config/rs6000/rs6000.h

@@ -392,7 +392,7 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 #define TARGET_XILINX_FPU   0
 
 /* Recast the processor type to the cpu attribute.  */
-#define rs6000_cpu_attr ((enum attr_cpu)rs6000_cpu)
+#define rs6000_cpu_attr ((enum attr_cpu)rs6000_tune)
 
 /* Define generic processor types based upon current deployment.  */
 #define PROCESSOR_COMMON    PROCESSOR_PPC601

gcc/config/rs6000/rs6000.opt

@@ -40,6 +40,10 @@ HOST_WIDE_INT x_rs6000_isa_flags_explicit
 TargetVariable
 enum processor_type rs6000_cpu = PROCESSOR_PPC603
 
+;; Current tuning
+TargetVariable
+enum processor_type rs6000_tune = PROCESSOR_PPC603
+
 ;; Always emit branch hint bits.
 TargetVariable
 unsigned char rs6000_always_hint