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      1 ;; Peephole optimizations for RISC-V for GNU compiler.
      2 ;; Copyright (C) 2011-2022 Free Software Foundation, Inc.
      3 ;; Contributed by Andrew Waterman (andrew (a] sifive.com).
      4 
      5 ;; This file is part of GCC.
      6 
      7 ;; GCC is free software; you can redistribute it and/or modify
      8 ;; it under the terms of the GNU General Public License as published by
      9 ;; the Free Software Foundation; either version 3, or (at your option)
     10 ;; any later version.
     11 
     12 ;; GCC is distributed in the hope that it will be useful,
     13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 ;; GNU General Public License for more details.
     16 
     17 ;; You should have received a copy of the GNU General Public License
     18 ;; along with GCC; see the file COPYING3.  If not see
     19 ;; <http://www.gnu.org/licenses/>.
     20 
     21 ;; Simplify (unsigned long)(unsigned int)a << const
     22 (define_peephole2
     23   [(set (match_operand:DI 0 "register_operand")
     24 	(ashift:DI (match_operand:DI 1 "register_operand")
     25 		   (match_operand 2 "const_int_operand")))
     26    (set (match_operand:DI 3 "register_operand")
     27 	(lshiftrt:DI (match_dup 0) (match_dup 2)))
     28    (set (match_operand:DI 4 "register_operand")
     29 	(ashift:DI (match_dup 3) (match_operand 5 "const_int_operand")))]
     30   "TARGET_64BIT
     31    && INTVAL (operands[5]) < INTVAL (operands[2])
     32    && (REGNO (operands[3]) == REGNO (operands[4])
     33        || peep2_reg_dead_p (3, operands[3]))"
     34   [(set (match_dup 0)
     35 	(ashift:DI (match_dup 1) (match_dup 2)))
     36    (set (match_dup 4)
     37 	(lshiftrt:DI (match_dup 0) (match_operand 5)))]
     38 {
     39   operands[5] = GEN_INT (INTVAL (operands[2]) - INTVAL (operands[5]));
     40 })
     41