398 lines
14 KiB
C
398 lines
14 KiB
C
/* TILE atomics.
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Copyright (C) 2011-2016 Free Software Foundation, Inc.
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Contributed by Walter Lee (walt@tilera.com)
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "tconfig.h"
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#include "coretypes.h"
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#include "atomic.h"
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#define bool unsigned char
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/* This code should be inlined by the compiler, but for now support
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it as out-of-line methods in libgcc. */
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static inline void
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pre_atomic_barrier (int model)
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{
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switch ((enum memmodel) model)
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{
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case MEMMODEL_RELEASE:
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case MEMMODEL_ACQ_REL:
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case MEMMODEL_SEQ_CST:
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__atomic_thread_fence (model);
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break;
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default:
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break;
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}
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return;
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}
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static inline void
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post_atomic_barrier (int model)
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{
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switch ((enum memmodel) model)
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{
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case MEMMODEL_ACQUIRE:
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case MEMMODEL_ACQ_REL:
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case MEMMODEL_SEQ_CST:
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__atomic_thread_fence (model);
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break;
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default:
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break;
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}
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return;
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}
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#define __unused __attribute__((unused))
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#define __fetch_and_do(proto, type, size, opname, top, bottom) \
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proto \
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{ \
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top; \
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type rv = arch_atomic_##opname(p, i); \
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bottom; \
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return rv; \
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}
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#define __atomic_fetch_and_do(type, size, opname) \
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__fetch_and_do(type __atomic_fetch_##opname##_##size(type* p, type i, int model), \
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type, size, opname, \
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pre_atomic_barrier(model), \
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post_atomic_barrier(model)) \
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__atomic_fetch_and_do (int, 4, add)
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__atomic_fetch_and_do (int, 4, sub)
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__atomic_fetch_and_do (int, 4, or)
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__atomic_fetch_and_do (int, 4, and)
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__atomic_fetch_and_do (int, 4, xor)
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__atomic_fetch_and_do (int, 4, nand)
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__atomic_fetch_and_do (long long, 8, add)
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__atomic_fetch_and_do (long long, 8, sub)
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__atomic_fetch_and_do (long long, 8, or)
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__atomic_fetch_and_do (long long, 8, and)
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__atomic_fetch_and_do (long long, 8, xor)
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__atomic_fetch_and_do (long long, 8, nand)
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#define __sync_fetch_and_do(type, size, opname) \
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__fetch_and_do(type __sync_fetch_and_##opname##_##size(type* p, type i), \
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type, size, opname, \
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arch_atomic_write_barrier(), \
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arch_atomic_read_barrier())
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__sync_fetch_and_do (int, 4, add)
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__sync_fetch_and_do (int, 4, sub)
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__sync_fetch_and_do (int, 4, or)
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__sync_fetch_and_do (int, 4, and)
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__sync_fetch_and_do (int, 4, xor)
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__sync_fetch_and_do (int, 4, nand)
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__sync_fetch_and_do (long long, 8, add)
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__sync_fetch_and_do (long long, 8, sub)
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__sync_fetch_and_do (long long, 8, or)
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__sync_fetch_and_do (long long, 8, and)
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__sync_fetch_and_do (long long, 8, xor)
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__sync_fetch_and_do (long long, 8, nand)
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#define __do_and_fetch(proto, type, size, opname, op, op2, top, bottom) \
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proto \
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{ \
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top; \
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type rv = op2 (arch_atomic_##opname(p, i) op i); \
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bottom; \
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return rv; \
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}
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#define __atomic_do_and_fetch(type, size, opname, op, op2) \
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__do_and_fetch(type __atomic_##opname##_fetch_##size(type* p, type i, int model), \
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type, size, opname, op, op2, \
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pre_atomic_barrier(model), \
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post_atomic_barrier(model)) \
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__atomic_do_and_fetch (int, 4, add, +, )
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__atomic_do_and_fetch (int, 4, sub, -, )
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__atomic_do_and_fetch (int, 4, or, |, )
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__atomic_do_and_fetch (int, 4, and, &, )
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__atomic_do_and_fetch (int, 4, xor, |, )
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__atomic_do_and_fetch (int, 4, nand, &, ~)
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__atomic_do_and_fetch (long long, 8, add, +, )
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__atomic_do_and_fetch (long long, 8, sub, -, )
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__atomic_do_and_fetch (long long, 8, or, |, )
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__atomic_do_and_fetch (long long, 8, and, &, )
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__atomic_do_and_fetch (long long, 8, xor, |, )
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__atomic_do_and_fetch (long long, 8, nand, &, ~)
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#define __sync_do_and_fetch(type, size, opname, op, op2) \
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__do_and_fetch(type __sync_##opname##_and_fetch_##size(type* p, type i), \
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type, size, opname, op, op2, \
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arch_atomic_write_barrier(), \
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arch_atomic_read_barrier()) \
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__sync_do_and_fetch (int, 4, add, +, )
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__sync_do_and_fetch (int, 4, sub, -, )
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__sync_do_and_fetch (int, 4, or, |, )
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__sync_do_and_fetch (int, 4, and, &, )
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__sync_do_and_fetch (int, 4, xor, |, )
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__sync_do_and_fetch (int, 4, nand, &, ~)
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__sync_do_and_fetch (long long, 8, add, +, )
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__sync_do_and_fetch (long long, 8, sub, -, )
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__sync_do_and_fetch (long long, 8, or, |, )
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__sync_do_and_fetch (long long, 8, and, &, )
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__sync_do_and_fetch (long long, 8, xor, |, )
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__sync_do_and_fetch (long long, 8, nand, &, ~)
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#define __atomic_exchange_methods(type, size) \
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bool \
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__atomic_compare_exchange_##size(volatile type* ptr, type* oldvalp, \
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type newval, bool weak __unused, \
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int models, int modelf __unused) \
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{ \
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type oldval = *oldvalp; \
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pre_atomic_barrier(models); \
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type retval = arch_atomic_val_compare_and_exchange(ptr, oldval, newval); \
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post_atomic_barrier(models); \
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bool success = (retval == oldval); \
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*oldvalp = retval; \
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return success; \
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} \
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\
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type \
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__atomic_exchange_##size(volatile type* ptr, type val, int model) \
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{ \
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pre_atomic_barrier(model); \
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type retval = arch_atomic_exchange(ptr, val); \
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post_atomic_barrier(model); \
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return retval; \
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}
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__atomic_exchange_methods (int, 4)
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__atomic_exchange_methods (long long, 8)
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#define __sync_exchange_methods(type, size) \
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type \
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__sync_val_compare_and_swap_##size(type* ptr, type oldval, type newval) \
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{ \
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arch_atomic_write_barrier(); \
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type retval = arch_atomic_val_compare_and_exchange(ptr, oldval, newval); \
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arch_atomic_read_barrier(); \
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return retval; \
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} \
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\
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bool \
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__sync_bool_compare_and_swap_##size(type* ptr, type oldval, type newval) \
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{ \
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arch_atomic_write_barrier(); \
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bool retval = arch_atomic_bool_compare_and_exchange(ptr, oldval, newval); \
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arch_atomic_read_barrier(); \
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return retval; \
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} \
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\
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type \
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__sync_lock_test_and_set_##size(type* ptr, type val) \
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{ \
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type retval = arch_atomic_exchange(ptr, val); \
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arch_atomic_acquire_barrier_value(retval); \
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return retval; \
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}
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__sync_exchange_methods (int, 4)
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__sync_exchange_methods (long long, 8)
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#ifdef __LITTLE_ENDIAN__
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#define BIT_OFFSET(n, type) ((n) * 8)
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#else
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#define BIT_OFFSET(n, type) ((4 - sizeof(type) - (n)) * 8)
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#endif
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/* Subword methods require the same approach for both TILEPro and
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TILE-Gx. We load the background data for the word, insert the
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desired subword piece, then compare-and-exchange it into place. */
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#define u8 unsigned char
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#define u16 unsigned short
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#define __subword_cmpxchg_body(type, size, ptr, guess, val) \
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({ \
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unsigned int *p = (unsigned int *)((unsigned long)ptr & ~3UL); \
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const int shift = BIT_OFFSET((unsigned long)ptr & 3UL, type); \
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const unsigned int valmask = (1 << (sizeof(type) * 8)) - 1; \
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const unsigned int bgmask = ~(valmask << shift); \
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unsigned int oldword = *p; \
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type oldval = (oldword >> shift) & valmask; \
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if (__builtin_expect((oldval == guess), 1)) { \
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unsigned int word = (oldword & bgmask) | ((val & valmask) << shift); \
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oldword = arch_atomic_val_compare_and_exchange(p, oldword, word); \
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oldval = (oldword >> shift) & valmask; \
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} \
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oldval; \
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}) \
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#define __atomic_subword_cmpxchg(type, size) \
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\
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bool \
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__atomic_compare_exchange_##size(volatile type* ptr, type* guess_ptr, \
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type val, bool weak __unused, int models, \
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int modelf __unused) \
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{ \
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pre_atomic_barrier(models); \
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type guess = *guess_ptr; \
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type oldval = __subword_cmpxchg_body(type, size, ptr, guess, val); \
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post_atomic_barrier(models); \
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bool success = (oldval == guess); \
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*guess_ptr = oldval; \
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return success; \
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}
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__atomic_subword_cmpxchg (u8, 1)
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__atomic_subword_cmpxchg (u16, 2)
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#define __sync_subword_cmpxchg(type, size) \
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\
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type \
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__sync_val_compare_and_swap_##size(type* ptr, type guess, type val) \
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{ \
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arch_atomic_write_barrier(); \
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type oldval = __subword_cmpxchg_body(type, size, ptr, guess, val); \
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arch_atomic_read_barrier(); \
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return oldval; \
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} \
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\
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bool \
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__sync_bool_compare_and_swap_##size(type* ptr, type guess, type val) \
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{ \
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type oldval = __sync_val_compare_and_swap_##size(ptr, guess, val); \
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return oldval == guess; \
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}
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__sync_subword_cmpxchg (u8, 1)
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__sync_subword_cmpxchg (u16, 2)
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/* For the atomic-update subword methods, we use the same approach as
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above, but we retry until we succeed if the compare-and-exchange
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fails. */
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#define __subword(type, proto, top, expr, bottom) \
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proto \
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{ \
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top \
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unsigned int *p = (unsigned int *)((unsigned long)ptr & ~3UL); \
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const int shift = BIT_OFFSET((unsigned long)ptr & 3UL, type); \
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const unsigned int valmask = (1 << (sizeof(type) * 8)) - 1; \
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const unsigned int bgmask = ~(valmask << shift); \
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unsigned int oldword, xword = *p; \
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type val, oldval; \
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do { \
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oldword = xword; \
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oldval = (oldword >> shift) & valmask; \
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val = expr; \
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unsigned int word = (oldword & bgmask) | ((val & valmask) << shift); \
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xword = arch_atomic_val_compare_and_exchange(p, oldword, word); \
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} while (__builtin_expect(xword != oldword, 0)); \
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bottom \
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}
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#define __atomic_subword_fetch(type, funcname, expr, retval) \
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__subword(type, \
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type __atomic_ ## funcname(volatile type *ptr, type i, int model), \
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pre_atomic_barrier(model);, \
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expr, \
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post_atomic_barrier(model); return retval;)
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__atomic_subword_fetch (u8, fetch_add_1, oldval + i, oldval)
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__atomic_subword_fetch (u8, fetch_sub_1, oldval - i, oldval)
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__atomic_subword_fetch (u8, fetch_or_1, oldval | i, oldval)
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__atomic_subword_fetch (u8, fetch_and_1, oldval & i, oldval)
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__atomic_subword_fetch (u8, fetch_xor_1, oldval ^ i, oldval)
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__atomic_subword_fetch (u8, fetch_nand_1, ~(oldval & i), oldval)
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__atomic_subword_fetch (u16, fetch_add_2, oldval + i, oldval)
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__atomic_subword_fetch (u16, fetch_sub_2, oldval - i, oldval)
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__atomic_subword_fetch (u16, fetch_or_2, oldval | i, oldval)
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__atomic_subword_fetch (u16, fetch_and_2, oldval & i, oldval)
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__atomic_subword_fetch (u16, fetch_xor_2, oldval ^ i, oldval)
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__atomic_subword_fetch (u16, fetch_nand_2, ~(oldval & i), oldval)
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__atomic_subword_fetch (u8, add_fetch_1, oldval + i, val)
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__atomic_subword_fetch (u8, sub_fetch_1, oldval - i, val)
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__atomic_subword_fetch (u8, or_fetch_1, oldval | i, val)
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__atomic_subword_fetch (u8, and_fetch_1, oldval & i, val)
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__atomic_subword_fetch (u8, xor_fetch_1, oldval ^ i, val)
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__atomic_subword_fetch (u8, nand_fetch_1, ~(oldval & i), val)
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__atomic_subword_fetch (u16, add_fetch_2, oldval + i, val)
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__atomic_subword_fetch (u16, sub_fetch_2, oldval - i, val)
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__atomic_subword_fetch (u16, or_fetch_2, oldval | i, val)
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__atomic_subword_fetch (u16, and_fetch_2, oldval & i, val)
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__atomic_subword_fetch (u16, xor_fetch_2, oldval ^ i, val)
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__atomic_subword_fetch (u16, nand_fetch_2, ~(oldval & i), val)
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#define __sync_subword_fetch(type, funcname, expr, retval) \
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__subword(type, \
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type __sync_ ## funcname(type *ptr, type i), \
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arch_atomic_read_barrier();, \
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expr, \
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arch_atomic_write_barrier(); return retval;)
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__sync_subword_fetch (u8, fetch_and_add_1, oldval + i, oldval)
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__sync_subword_fetch (u8, fetch_and_sub_1, oldval - i, oldval)
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__sync_subword_fetch (u8, fetch_and_or_1, oldval | i, oldval)
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__sync_subword_fetch (u8, fetch_and_and_1, oldval & i, oldval)
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__sync_subword_fetch (u8, fetch_and_xor_1, oldval ^ i, oldval)
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__sync_subword_fetch (u8, fetch_and_nand_1, ~(oldval & i), oldval)
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__sync_subword_fetch (u16, fetch_and_add_2, oldval + i, oldval)
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__sync_subword_fetch (u16, fetch_and_sub_2, oldval - i, oldval)
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__sync_subword_fetch (u16, fetch_and_or_2, oldval | i, oldval)
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__sync_subword_fetch (u16, fetch_and_and_2, oldval & i, oldval)
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__sync_subword_fetch (u16, fetch_and_xor_2, oldval ^ i, oldval)
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__sync_subword_fetch (u16, fetch_and_nand_2, ~(oldval & i), oldval)
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__sync_subword_fetch (u8, add_and_fetch_1, oldval + i, val)
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__sync_subword_fetch (u8, sub_and_fetch_1, oldval - i, val)
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__sync_subword_fetch (u8, or_and_fetch_1, oldval | i, val)
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__sync_subword_fetch (u8, and_and_fetch_1, oldval & i, val)
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__sync_subword_fetch (u8, xor_and_fetch_1, oldval ^ i, val)
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__sync_subword_fetch (u8, nand_and_fetch_1, ~(oldval & i), val)
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__sync_subword_fetch (u16, add_and_fetch_2, oldval + i, val)
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__sync_subword_fetch (u16, sub_and_fetch_2, oldval - i, val)
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__sync_subword_fetch (u16, or_and_fetch_2, oldval | i, val)
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__sync_subword_fetch (u16, and_and_fetch_2, oldval & i, val)
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__sync_subword_fetch (u16, xor_and_fetch_2, oldval ^ i, val)
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__sync_subword_fetch (u16, nand_and_fetch_2, ~(oldval & i), val)
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#define __atomic_subword_lock(type, size) \
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__subword(type, \
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type __atomic_exchange_##size(volatile type* ptr, type nval, int model), \
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pre_atomic_barrier(model);, \
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nval, \
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post_atomic_barrier(model); return oldval;)
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__atomic_subword_lock (u8, 1)
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__atomic_subword_lock (u16, 2)
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#define __sync_subword_lock(type, size) \
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__subword(type, \
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type __sync_lock_test_and_set_##size(type* ptr, type nval), \
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, \
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nval, \
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arch_atomic_acquire_barrier_value(oldval); return oldval;)
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__sync_subword_lock (u8, 1)
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__sync_subword_lock (u16, 2)
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