[NDS32] Implement bswapsi2 and bswaphi2 patterns.

gcc/
	* config/nds32/nds32.md (bswapsi2, bswaphi2): New patterns.

From-SVN: r260804

gcc/ChangeLog

 2018-05-27  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32.md (bswapsi2, bswaphi2): New patterns.
+
+2018-05-27  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* config/nds32/nds32.c (nds32_attribute_table): Add "no_prologue".
 	(nds32_init_machine_status): Initialize machine->attr_naked_p and
 	machine->attr_no_prologue_p.

gcc/config/nds32/nds32.md

@@ -2180,6 +2180,26 @@
   [(set_attr "type"    "alu")
    (set_attr "length"    "4")]
 )
+
+(define_expand "bswapsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(bswap:SI (match_operand:SI 1 "register_operand" "r")))]
+  ""
+{
+  emit_insn (gen_unspec_wsbh (operands[0], operands[1]));
+  emit_insn (gen_rotrsi3 (operands[0], operands[0], GEN_INT (16)));
+  DONE;
+})
+
+(define_insn "bswaphi2"
+  [(set (match_operand:HI 0 "register_operand" "=r")
+	(bswap:HI (match_operand:HI 1 "register_operand" "r")))]
+  ""
+  "wsbh\t%0, %1"
+  [(set_attr "type"    "alu")
+   (set_attr "length"    "4")]
+)
+
 ;; ----------------------------------------------------------------------------
 
 ;; Patterns for exception handling