3e6ab5cefa
The issue is that relax_delay_slots can streamline the CFG in some cases, in particular remove BARRIERs, but removing BARRIERs changes the way the instructions are associated with (basic) blocks by the liveness analysis code in resource.c (find_basic_block) and thus can cause entries in the cache maintained by resource.c to become outdated, thus producing wrong answers downstream. The fix is to invalidate the cache entries affected by the removal of BARRIERs in relax_delay_slots, i.e. for the instructions down to the next BARRIER. PR rtl-optimization/94119 * resource.h (clear_hashed_info_until_next_barrier): Declare. * resource.c (clear_hashed_info_until_next_barrier): New function. * reorg.c (add_to_delay_list): Fix formatting. (relax_delay_slots): Call clear_hashed_info_until_next_barrier on the next instruction after removing a BARRIER.
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* Definitions for computing resource usage of specific insns.
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_RESOURCE_H
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#define GCC_RESOURCE_H
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/* Macro to clear all resources. */
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#define CLEAR_RESOURCE(RES) \
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do { (RES)->memory = (RES)->volatil = (RES)->cc = 0; \
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CLEAR_HARD_REG_SET ((RES)->regs); } while (0)
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/* The resources used by a given insn. */
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struct resources
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{
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char memory; /* Insn sets or needs a memory location. */
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char volatil; /* Insn sets or needs a volatile memory loc. */
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char cc; /* Insn sets or needs the condition codes. */
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HARD_REG_SET regs; /* Which registers are set or needed. */
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};
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/* The kinds of rtl mark_*_resources will consider */
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enum mark_resource_type
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{
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MARK_SRC_DEST = 0,
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MARK_SRC_DEST_CALL = 1
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};
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extern void mark_target_live_regs (rtx_insn *, rtx, struct resources *);
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extern void mark_set_resources (rtx, struct resources *, int,
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enum mark_resource_type);
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extern void mark_referenced_resources (rtx, struct resources *, bool);
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extern void clear_hashed_info_for_insn (rtx_insn *);
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extern void clear_hashed_info_until_next_barrier (rtx_insn *);
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extern void incr_ticks_for_insn (rtx_insn *);
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extern void mark_end_of_function_resources (rtx, bool);
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extern void init_resource_info (rtx_insn *);
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extern void free_resource_info (void);
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#endif /* GCC_RESOURCE_H */
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