117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
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/* Prototypes of memory model helper functions.
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Copyright (C) 2011-2019 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_MEMMODEL_H
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#define GCC_MEMMODEL_H
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/* Suppose that higher bits are target dependent. */
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#define MEMMODEL_MASK ((1<<16)-1)
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/* Legacy sync operations set this upper flag in the memory model. This allows
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targets that need to do something stronger for sync operations to
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differentiate with their target patterns and issue a more appropriate insn
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sequence. See bugzilla 65697 for background. */
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#define MEMMODEL_SYNC (1<<15)
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/* Memory model without SYNC bit for targets/operations that do not care. */
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#define MEMMODEL_BASE_MASK (MEMMODEL_SYNC-1)
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/* Memory model types for the __atomic* builtins.
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This must match the order in libstdc++-v3/include/bits/atomic_base.h. */
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enum memmodel
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{
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MEMMODEL_RELAXED = 0,
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MEMMODEL_CONSUME = 1,
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MEMMODEL_ACQUIRE = 2,
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MEMMODEL_RELEASE = 3,
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MEMMODEL_ACQ_REL = 4,
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MEMMODEL_SEQ_CST = 5,
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MEMMODEL_LAST = 6,
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MEMMODEL_SYNC_ACQUIRE = MEMMODEL_ACQUIRE | MEMMODEL_SYNC,
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MEMMODEL_SYNC_RELEASE = MEMMODEL_RELEASE | MEMMODEL_SYNC,
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MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC,
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/* Say that all the higher bits are valid target extensions. */
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MEMMODEL_MAX = INTTYPE_MAXIMUM (int)
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};
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/* Return the memory model from a host integer. */
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static inline enum memmodel
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memmodel_from_int (unsigned HOST_WIDE_INT val)
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{
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return (enum memmodel) (val & MEMMODEL_MASK);
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}
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/* Return the base memory model from a host integer. */
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static inline enum memmodel
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memmodel_base (unsigned HOST_WIDE_INT val)
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{
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return (enum memmodel) (val & MEMMODEL_BASE_MASK);
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}
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/* Return TRUE if the memory model is RELAXED. */
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static inline bool
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is_mm_relaxed (enum memmodel model)
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{
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return (model & MEMMODEL_BASE_MASK) == MEMMODEL_RELAXED;
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}
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/* Return TRUE if the memory model is CONSUME. */
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static inline bool
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is_mm_consume (enum memmodel model)
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{
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return (model & MEMMODEL_BASE_MASK) == MEMMODEL_CONSUME;
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}
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/* Return TRUE if the memory model is ACQUIRE. */
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static inline bool
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is_mm_acquire (enum memmodel model)
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{
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return (model & MEMMODEL_BASE_MASK) == MEMMODEL_ACQUIRE;
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}
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/* Return TRUE if the memory model is RELEASE. */
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static inline bool
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is_mm_release (enum memmodel model)
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{
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return (model & MEMMODEL_BASE_MASK) == MEMMODEL_RELEASE;
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}
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/* Return TRUE if the memory model is ACQ_REL. */
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static inline bool
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is_mm_acq_rel (enum memmodel model)
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{
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return (model & MEMMODEL_BASE_MASK) == MEMMODEL_ACQ_REL;
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}
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/* Return TRUE if the memory model is SEQ_CST. */
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static inline bool
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is_mm_seq_cst (enum memmodel model)
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{
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return (model & MEMMODEL_BASE_MASK) == MEMMODEL_SEQ_CST;
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}
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/* Return TRUE if the memory model is a SYNC variant. */
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static inline bool
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is_mm_sync (enum memmodel model)
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{
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return (model & MEMMODEL_SYNC);
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}
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#endif /* GCC_MEMMODEL_H */
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