--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/csky/csky_isa.def	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,59 @@
+/* ISA feature descriptions for the C-SKY back end.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   Contributed by C-SKY Microsystems and Mentor Graphics.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Before using #include to read this file, define a macro:
+      CSKY_ISA(CNAME, DESCRIPTION)
+   */
+
+/* Common insns */
+CSKY_ISA (E1,	 "Extended insns for arch ck801	 from base")
+CSKY_ISA (E2,	 "Extended insns for arch ck802	 from base")
+CSKY_ISA (2E3,	 "Extended insns for arch ck803	 from ck802")
+CSKY_ISA (3E3r1, "Extended insns for cpu ck803n from ck803")
+CSKY_ISA (3E7,	 "Extended insns for arch ck807	 from ck803")
+CSKY_ISA (7E10,	 "Extended insns for arch ck810	 from ck807")
+
+/* Special insns */
+CSKY_ISA (div,	  "divide insns")
+
+/* Extended insns */
+CSKY_ISA (dsp,	 "Extended insns for DSP")
+CSKY_ISA (java,	 "Extended insns for Java")
+
+CSKY_ISA (fpv2_sf,    "Single precision operations supported")
+CSKY_ISA (fpv2_df,    "Double precision operations supported")
+CSKY_ISA (fpv2_divd,  "Double precision div operations supported")
+
+/* Specific insns mode */
+#ifdef	CSKY_ISA_MACRO
+#define CSKY_ISA_CK801	    CSKY_ISA_FEATURE_GET (E1)
+#define CSKY_ISA_CK802	    CSKY_ISA_FEATURE_GET (E2)
+#define CSKY_ISA_CK803	    CSKY_ISA_CK802, CSKY_ISA_FEATURE_GET (2E3), \
+			    CSKY_ISA_FEATURE_GET (div)
+#define CSKY_ISA_CK803R1    CSKY_ISA_CK803, CSKY_ISA_FEATURE_GET (3E3r1)
+#define CSKY_ISA_CK807	    CSKY_ISA_CK803, CSKY_ISA_FEATURE_GET (3E7)
+#define CSKY_ISA_CK810	    CSKY_ISA_CK807, CSKY_ISA_FEATURE_GET (7E10)
+
+#define CSKY_ISA_DSP	    CSKY_ISA_FEATURE_GET (dsp)
+
+#define CSKY_ISA_FPv2_SF    CSKY_ISA_FEATURE_GET (fpv2_sf)
+#define CSKY_ISA_FPv2	    CSKY_ISA_FPv2_SF, CSKY_ISA_FEATURE_GET (fpv2_df)
+#define CSKY_ISA_FPv2_DIVD  CSKY_ISA_FPv2, CSKY_ISA_FEATURE_GET (fpv2_divd)
+#endif