RISC-V: Add missing negate patterns.

	gcc/
	* config/riscv/riscv.md (subsi3_extended2): Add J constraint.
	(negdi2, negsi2, negsi2_extended, negsi2_extended2): New.

From-SVN: r264655

gcc/ChangeLog

+2018-09-26  Jim Wilson  <jimw@sifive.com>
+
+	* config/riscv/riscv.md (subsi3_extended2): Add J constraint.
+	(negdi2, negsi2, negsi2_extended, negsi2_extended2): New.
+
 2018-09-26  Martin Sebor  <msebor@redhat.com>
 
 	* tree.c (zerop): Change return type to bool.

gcc/config/riscv/riscv.md

@@ -514,9 +514,9 @@
    (set_attr "mode" "SI")])
 
 (define_insn "*subsi3_extended2"
-  [(set (match_operand:DI                        0 "register_operand" "=r")
+  [(set (match_operand:DI                        0 "register_operand" "= r")
 	(sign_extend:DI
-	  (subreg:SI (minus:DI (match_operand:DI 1 "reg_or_0_operand" " r")
+	  (subreg:SI (minus:DI (match_operand:DI 1 "reg_or_0_operand" " rJ")
 			       (match_operand:DI 2 "register_operand" "  r"))
 		     0)))]
   "TARGET_64BIT"
@@ -524,6 +524,41 @@
   [(set_attr "type" "arith")
    (set_attr "mode" "SI")])
 
+(define_insn "negdi2"
+  [(set (match_operand:DI         0 "register_operand" "=r")
+	(neg:DI (match_operand:DI 1 "register_operand" " r")))]
+  "TARGET_64BIT"
+  "neg\t%0,%1"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "DI")])
+
+(define_insn "negsi2"
+  [(set (match_operand:SI         0 "register_operand" "=r")
+	(neg:SI (match_operand:SI 1 "register_operand" " r")))]
+  ""
+  { return TARGET_64BIT ? "negw\t%0,%1" : "neg\t%0,%1"; }
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*negsi2_extended"
+  [(set (match_operand:DI          0 "register_operand" "=r")
+	(sign_extend:DI
+	 (neg:SI (match_operand:SI 1 "register_operand" " r"))))]
+  "TARGET_64BIT"
+  "negw\t%0,%1"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*negsi2_extended2"
+  [(set (match_operand:DI                     0 "register_operand" "=r")
+	(sign_extend:DI
+	 (subreg:SI (neg:DI (match_operand:DI 1 "register_operand" " r"))
+	 	    0)))]
+  "TARGET_64BIT"
+  "negw\t%0,%1"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
 ;;
 ;;  ....................
 ;;