gcc/config/riscv/peephole.md

   1 ;; Peephole optimizations for RISC-V for GNU compiler.
   2 ;; Copyright (C) 2011-2023 Free Software Foundation, Inc.
   3 ;; Contributed by Andrew Waterman (andrew@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
  42 ;; ZCMP
  43 (define_peephole2
  44   [(set (match_operand:X 0 "a0a1_reg_operand")
  45         (match_operand:X 1 "zcmp_mv_sreg_operand"))
  46    (set (match_operand:X 2 "a0a1_reg_operand")
  47         (match_operand:X 3 "zcmp_mv_sreg_operand"))]
  48   "TARGET_ZCMP
  49    && (REGNO (operands[2]) != REGNO (operands[0]))"
  50   [(parallel [(set (match_dup 0)
  51                    (match_dup 1))
  52               (set (match_dup 2)
  53                    (match_dup 3))])]
  54 )
  55
  56 (define_peephole2
  57   [(set (match_operand:X 0 "zcmp_mv_sreg_operand")
  58         (match_operand:X 1 "a0a1_reg_operand"))
  59    (set (match_operand:X 2 "zcmp_mv_sreg_operand")
  60         (match_operand:X 3 "a0a1_reg_operand"))]
  61   "TARGET_ZCMP
  62    && (REGNO (operands[0]) != REGNO (operands[2]))
  63    && (REGNO (operands[1]) != REGNO (operands[3]))"
  64   [(parallel [(set (match_dup 0)
  65                    (match_dup 1))
  66               (set (match_dup 2)
  67                    (match_dup 3))])]
  68 )