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1 ;; Peephole optimizations for RISC-V for GNU compiler.
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2 ;; Copyright (C) 2011-2017 Free Software Foundation, Inc.
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3 ;; Contributed by Andrew Waterman (andrew@sifive.com).
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4
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5 ;; This file is part of GCC.
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6
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7 ;; GCC is free software; you can redistribute it and/or modify
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8 ;; it under the terms of the GNU General Public License as published by
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9 ;; the Free Software Foundation; either version 3, or (at your option)
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10 ;; any later version.
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11
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12 ;; GCC is distributed in the hope that it will be useful,
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13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 ;; GNU General Public License for more details.
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16
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17 ;; You should have received a copy of the GNU General Public License
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18 ;; along with GCC; see the file COPYING3. If not see
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19 ;; <http://www.gnu.org/licenses/>.
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20
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21 ;; Simplify (unsigned long)(unsigned int)a << const
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22 (define_peephole2
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23 [(set (match_operand:DI 0 "register_operand")
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24 (ashift:DI (match_operand:DI 1 "register_operand")
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25 (match_operand 2 "const_int_operand")))
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26 (set (match_operand:DI 3 "register_operand")
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27 (lshiftrt:DI (match_dup 0) (match_dup 2)))
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28 (set (match_operand:DI 4 "register_operand")
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29 (ashift:DI (match_dup 3) (match_operand 5 "const_int_operand")))]
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30 "TARGET_64BIT
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31 && INTVAL (operands[5]) < INTVAL (operands[2])
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32 && (REGNO (operands[3]) == REGNO (operands[4])
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33 || peep2_reg_dead_p (3, operands[3]))"
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34 [(set (match_dup 0)
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35 (ashift:DI (match_dup 1) (match_dup 2)))
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36 (set (match_dup 4)
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37 (lshiftrt:DI (match_dup 0) (match_operand 5)))]
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38 {
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39 operands[5] = GEN_INT (INTVAL (operands[2]) - INTVAL (operands[5]));
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40 })
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