;; Peephole optimizations for RISC-V for GNU compiler. ;; Copyright (C) 2011-2022 Free Software Foundation, Inc. ;; Contributed by Andrew Waterman (andrew@sifive.com).

;; 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/.

;; Simplify (unsigned long)(unsigned int)a << const (define_peephole2 [(set (match_operand:DI 0 “register_operand”) (ashift:DI (match_operand:DI 1 “register_operand”) (match_operand 2 “const_int_operand”))) (set (match_operand:DI 3 “register_operand”) (lshiftrt:DI (match_dup 0) (match_dup 2))) (set (match_operand:DI 4 “register_operand”) (ashift:DI (match_dup 3) (match_operand 5 “const_int_operand”)))] “TARGET_64BIT && INTVAL (operands[5]) < INTVAL (operands[2]) && (REGNO (operands[3]) == REGNO (operands[4]) || peep2_reg_dead_p (3, operands[3]))” [(set (match_dup 0) (ashift:DI (match_dup 1) (match_dup 2))) (set (match_dup 4) (lshiftrt:DI (match_dup 0) (match_operand 5)))] { operands[5] = GEN_INT (INTVAL (operands[2]) - INTVAL (operands[5])); })