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/* Avoid store forwarding optimization pass.
Copyright (C) 2024 Free Software Foundation, Inc.
Contributed by VRULL GmbH.
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/>. */
#ifndef GCC_AVOID_STORE_FORWARDING_H
#define GCC_AVOID_STORE_FORWARDING_H
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "rtl.h"
struct store_fwd_info
{
/* The store instruction that is a store forwarding candidate. */
rtx_insn *store_insn;
/* SET_DEST (single_set (store_insn)). */
rtx store_mem;
/* The temporary that will hold the stored value at the original store
position. */
rtx mov_reg;
/* The instruction sequence that inserts the stored value's bits at the
appropriate position in the loaded value. */
rtx_insn *bits_insert_insns;
/* An instruction that saves the store's value in a register temporarily,
(set (reg X) (SET_SRC (store_insn))). */
rtx_insn *save_store_value_insn;
/* An instruction that stores the saved value back to memory,
(set (SET_DEST (store_insn)) (reg X)). */
rtx_insn *store_saved_value_insn;
/* The byte offset for the store's position within the load. */
HOST_WIDE_INT offset;
unsigned int insn_cnt;
bool remove;
bool forwarded;
};
#endif /* GCC_AVOID_STORE_FORWARDING_H */
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