riscv.c (riscv_emit_float_compare): Use fallthru attribute rather than comments.

        * config/riscv/riscv.c (riscv_emit_float_compare): Use fallthru
        attribute rather than comments.

From-SVN: r246101

gcc/ChangeLog

 2017-03-13  Jeff Law  <law@redhat.com>
 
+	* config/riscv/riscv.c (riscv_emit_float_compare): Use fallthru
+	attribute rather than comments.
+
 	* config/pdp11/pdp11.md (movmemhi): Adjust operand numbers to
 	match_scratch operand is highest.
 

gcc/config/riscv/riscv.c

@@ -2089,13 +2089,13 @@ riscv_emit_float_compare (enum rtx_code *code, rtx *op0, rtx *op1)
 
     case UNLT:
       std::swap (cmp_op0, cmp_op1);
-      /* Fall through.  */
+      __attribute__((fallthrough));
 
     UNORDERED_COMPARISON(UNGT, le)
 
     case UNLE:
       std::swap (cmp_op0, cmp_op1);
-      /* Fall through.  */
+      __attribute__((fallthrough));
 
     UNORDERED_COMPARISON(UNGE, lt)
 #undef UNORDERED_COMPARISON