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[/] [openrisc/] [tags/] [gnu-dev/] [fsf-gcc-snapshot-1-mar-12/] [or1k-gcc/] [libgcc/] [config/] [tilepro/] [atomic.c] - Rev 783
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/* TILE atomics. Copyright (C) 2011, 2012 Free Software Foundation, Inc. Contributed by Walter Lee (walt@tilera.com) This file 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. This file 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. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #include "system.h" #include "coretypes.h" #include "atomic.h" /* This code should be inlined by the compiler, but for now support it as out-of-line methods in libgcc. */ static void pre_atomic_barrier (int model) { switch ((enum memmodel) model) { case MEMMODEL_RELEASE: case MEMMODEL_ACQ_REL: case MEMMODEL_SEQ_CST: __atomic_thread_fence (model); break; default: break; } return; } static void post_atomic_barrier (int model) { switch ((enum memmodel) model) { case MEMMODEL_ACQUIRE: case MEMMODEL_ACQ_REL: case MEMMODEL_SEQ_CST: __atomic_thread_fence (model); break; default: break; } return; } #define __unused __attribute__((unused)) /* Provide additional methods not implemented by atomic.h. */ #define atomic_xor(mem, mask) \ __atomic_update_cmpxchg(mem, mask, __old ^ __value) #define atomic_nand(mem, mask) \ __atomic_update_cmpxchg(mem, mask, ~(__old & __value)) #define __atomic_fetch_and_do(type, size, opname) \ type \ __atomic_fetch_##opname##_##size(type* p, type i, int model) \ { \ pre_atomic_barrier(model); \ type rv = atomic_##opname(p, i); \ post_atomic_barrier(model); \ return rv; \ } __atomic_fetch_and_do (int, 4, add) __atomic_fetch_and_do (int, 4, sub) __atomic_fetch_and_do (int, 4, or) __atomic_fetch_and_do (int, 4, and) __atomic_fetch_and_do (int, 4, xor) __atomic_fetch_and_do (int, 4, nand) __atomic_fetch_and_do (long long, 8, add) __atomic_fetch_and_do (long long, 8, sub) __atomic_fetch_and_do (long long, 8, or) __atomic_fetch_and_do (long long, 8, and) __atomic_fetch_and_do (long long, 8, xor) __atomic_fetch_and_do (long long, 8, nand) #define __atomic_do_and_fetch(type, size, opname, op) \ type \ __atomic_##opname##_fetch_##size(type* p, type i, int model) \ { \ pre_atomic_barrier(model); \ type rv = atomic_##opname(p, i) op i; \ post_atomic_barrier(model); \ return rv; \ } __atomic_do_and_fetch (int, 4, add, +) __atomic_do_and_fetch (int, 4, sub, -) __atomic_do_and_fetch (int, 4, or, |) __atomic_do_and_fetch (int, 4, and, &) __atomic_do_and_fetch (int, 4, xor, |) __atomic_do_and_fetch (int, 4, nand, &) __atomic_do_and_fetch (long long, 8, add, +) __atomic_do_and_fetch (long long, 8, sub, -) __atomic_do_and_fetch (long long, 8, or, |) __atomic_do_and_fetch (long long, 8, and, &) __atomic_do_and_fetch (long long, 8, xor, |) __atomic_do_and_fetch (long long, 8, nand, &) #define __atomic_exchange_methods(type, size) \ bool \ __atomic_compare_exchange_##size(volatile type* ptr, type* oldvalp, \ type newval, bool weak __unused, \ int models, int modelf __unused) \ { \ type oldval = *oldvalp; \ pre_atomic_barrier(models); \ type retval = atomic_val_compare_and_exchange(ptr, oldval, newval); \ post_atomic_barrier(models); \ bool success = (retval == oldval); \ *oldvalp = retval; \ return success; \ } \ \ type \ __atomic_exchange_##size(volatile type* ptr, type val, int model) \ { \ pre_atomic_barrier(model); \ type retval = atomic_exchange(ptr, val); \ post_atomic_barrier(model); \ return retval; \ } __atomic_exchange_methods (int, 4) __atomic_exchange_methods (long long, 8) /* Subword methods require the same approach for both TILEPro and TILE-Gx. We load the background data for the word, insert the desired subword piece, then compare-and-exchange it into place. */ #define u8 unsigned char #define u16 unsigned short #define __atomic_subword_cmpxchg(type, size) \ \ bool \ __atomic_compare_exchange_##size(volatile type* ptr, type* guess, \ type val, bool weak __unused, int models, \ int modelf __unused) \ { \ pre_atomic_barrier(models); \ unsigned int *p = (unsigned int *)((unsigned long)ptr & ~3UL); \ const int shift = ((unsigned long)ptr & 3UL) * 8; \ const unsigned int valmask = (1 << (sizeof(type) * 8)) - 1; \ const unsigned int bgmask = ~(valmask << shift); \ unsigned int oldword = *p; \ type oldval = (oldword >> shift) & valmask; \ if (__builtin_expect((oldval == *guess), 1)) { \ unsigned int word = (oldword & bgmask) | ((val & valmask) << shift); \ oldword = atomic_val_compare_and_exchange(p, oldword, word); \ oldval = (oldword >> shift) & valmask; \ } \ post_atomic_barrier(models); \ bool success = (oldval == *guess); \ *guess = oldval; \ return success; \ } __atomic_subword_cmpxchg (u8, 1) __atomic_subword_cmpxchg (u16, 2) /* For the atomic-update subword methods, we use the same approach as above, but we retry until we succeed if the compare-and-exchange fails. */ #define __atomic_subword(type, proto, top, expr, bottom) \ proto \ { \ top \ unsigned int *p = (unsigned int *)((unsigned long)ptr & ~3UL); \ const int shift = ((unsigned long)ptr & 3UL) * 8; \ const unsigned int valmask = (1 << (sizeof(type) * 8)) - 1; \ const unsigned int bgmask = ~(valmask << shift); \ unsigned int oldword, xword = *p; \ type val, oldval; \ do { \ oldword = xword; \ oldval = (oldword >> shift) & valmask; \ val = expr; \ unsigned int word = (oldword & bgmask) | ((val & valmask) << shift); \ xword = atomic_val_compare_and_exchange(p, oldword, word); \ } while (__builtin_expect(xword != oldword, 0)); \ bottom \ } #define __atomic_subword_fetch(type, funcname, expr, retval) \ __atomic_subword(type, \ type __atomic_ ## funcname(volatile type *ptr, type i, int model), \ pre_atomic_barrier(model);, \ expr, \ post_atomic_barrier(model); return retval;) __atomic_subword_fetch (u8, fetch_add_1, oldval + i, oldval) __atomic_subword_fetch (u8, fetch_sub_1, oldval - i, oldval) __atomic_subword_fetch (u8, fetch_or_1, oldval | i, oldval) __atomic_subword_fetch (u8, fetch_and_1, oldval & i, oldval) __atomic_subword_fetch (u8, fetch_xor_1, oldval ^ i, oldval) __atomic_subword_fetch (u8, fetch_nand_1, ~(oldval & i), oldval) __atomic_subword_fetch (u16, fetch_add_2, oldval + i, oldval) __atomic_subword_fetch (u16, fetch_sub_2, oldval - i, oldval) __atomic_subword_fetch (u16, fetch_or_2, oldval | i, oldval) __atomic_subword_fetch (u16, fetch_and_2, oldval & i, oldval) __atomic_subword_fetch (u16, fetch_xor_2, oldval ^ i, oldval) __atomic_subword_fetch (u16, fetch_nand_2, ~(oldval & i), oldval) __atomic_subword_fetch (u8, add_fetch_1, oldval + i, val) __atomic_subword_fetch (u8, sub_fetch_1, oldval - i, val) __atomic_subword_fetch (u8, or_fetch_1, oldval | i, val) __atomic_subword_fetch (u8, and_fetch_1, oldval & i, val) __atomic_subword_fetch (u8, xor_fetch_1, oldval ^ i, val) __atomic_subword_fetch (u8, nand_fetch_1, ~(oldval & i), val) __atomic_subword_fetch (u16, add_fetch_2, oldval + i, val) __atomic_subword_fetch (u16, sub_fetch_2, oldval - i, val) __atomic_subword_fetch (u16, or_fetch_2, oldval | i, val) __atomic_subword_fetch (u16, and_fetch_2, oldval & i, val) __atomic_subword_fetch (u16, xor_fetch_2, oldval ^ i, val) __atomic_subword_fetch (u16, nand_fetch_2, ~(oldval & i), val) #define __atomic_subword_lock(type, size) \ \ __atomic_subword(type, \ type __atomic_exchange_##size(volatile type* ptr, type nval, int model), \ pre_atomic_barrier(model);, \ nval, \ post_atomic_barrier(model); return oldval;) __atomic_subword_lock (u8, 1) __atomic_subword_lock (u16, 2)