gcc/avoid-store-forwarding.h

   1 /* Avoid store forwarding optimization pass.
   2    Copyright (C) 2024-2025 Free Software Foundation, Inc.
   3    Contributed by VRULL GmbH.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    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, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    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 #ifndef GCC_AVOID_STORE_FORWARDING_H
  22 #define GCC_AVOID_STORE_FORWARDING_H
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "backend.h"
  28 #include "rtl.h"
  29
  30 struct store_fwd_info
  31 {
  32   /* The store instruction that is a store forwarding candidate.  */
  33   rtx_insn *store_insn;
  34   /* SET_DEST (single_set (store_insn)).  */
  35   rtx store_mem;
  36   /* The temporary that will hold the stored value at the original store
  37      position.  */
  38   rtx mov_reg;
  39   /* The instruction sequence that inserts the stored value's bits at the
  40      appropriate position in the loaded value.  */
  41   rtx_insn *bits_insert_insns;
  42   /* An instruction that saves the store's value in a register temporarily,
  43      (set (reg X) (SET_SRC (store_insn))).  */
  44   rtx_insn *save_store_value_insn;
  45   /* An instruction that stores the saved value back to memory,
  46      (set (SET_DEST (store_insn)) (reg X)).  */
  47   rtx_insn *store_saved_value_insn;
  48   /* The byte offset for the store's position within the load.  */
  49   HOST_WIDE_INT offset;
  50
  51   unsigned int insn_cnt;
  52   bool remove;
  53   bool forwarded;
  54 };
  55
  56 #endif  /* GCC_AVOID_STORE_FORWARDING_H  */