[ARC] Enable DBNZ for core3 and newer CPUs.

2018-09-17  Vineet Gupta  <vgupta@synopsys.com>

	* config/arc/arc.c: Object attributes for core4 not reflected
	correctly.
	* config/arc/arc.h: Don't restrict DBNZ to core3 (core4 includes
	core3).

From-SVN: r264362

gcc/ChangeLog

+2018-09-17  Vineet Gupta  <vgupta@synopsys.com>
+
+	* config/arc/arc.c: Object attributes for core4 not reflected
+	correctly.
+	* config/arc/arc.h: Don't restrict DBNZ to core3 (core4 includes
+	core3).
+
 2018-09-17  Alexey Brodkin  <abrodkin@synopsys.com>
 
 	* config/arc/linux.h (LINK_EH_SPEC): Add missing space.

gcc/config/arc/arc.c

@@ -5181,7 +5181,8 @@ static void arc_file_start (void)
 	       TARGET_OPTFPE ? 1 : 0);
   if (TARGET_V2)
     asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_CPU_variation, %d\n",
-		 arc_tune == ARC_TUNE_CORE_3 ? 3 : 2);
+		 (arc_tune < ARC_TUNE_CORE_3) ? 2 :
+		 (arc_tune == ARC_TUNE_CORE_3 ? 3 : 4));
 }
 
 /* Implement `TARGET_ASM_FILE_END'.  */

gcc/config/arc/arc.h

@@ -1635,7 +1635,7 @@ enum
 /* Custom FP instructions used by QuarkSE EM cpu.  */
 #define TARGET_FPX_QUARK    (TARGET_EM && TARGET_SPFP		\
 			     && (arc_fpu_build == FPX_QK))
-/* DBNZ support is available for ARCv2 core3 cpus.  */
-#define TARGET_DBNZ (TARGET_V2 && (arc_tune == ARC_TUNE_CORE_3))
+/* DBNZ support is available for ARCv2 core3 and newer cpus.  */
+#define TARGET_DBNZ (TARGET_V2 && (arc_tune >= ARC_TUNE_CORE_3))
 
 #endif /* GCC_ARC_H */