| /* os.h -*-C++-*- |
| * |
| ************************************************************************* |
| * |
| * Copyright (C) 2009-2016, Intel Corporation |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Intel Corporation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY |
| * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * |
| * ********************************************************************* |
| * |
| * PLEASE NOTE: This file is a downstream copy of a file mainitained in |
| * a repository at cilkplus.org. Changes made to this file that are not |
| * submitted through the contribution process detailed at |
| * http://www.cilkplus.org/submit-cilk-contribution will be lost the next |
| * time that a new version is released. Changes only submitted to the |
| * GNU compiler collection or posted to the git repository at |
| * https://bitbucket.org/intelcilkruntime/intel-cilk-runtime.git are |
| * not tracked. |
| * |
| * We welcome your contributions to this open source project. Thank you |
| * for your assistance in helping us improve Cilk Plus. |
| **************************************************************************/ |
| |
| /* gcc before 4.4 does not implement __sync_synchronize properly */ |
| #if (__ICC >= 1110 && !(__MIC__ || __MIC2__)) \ |
| || (!defined __ICC && __GNUC__ * 10 + __GNUC_MINOR__ > 43) |
| # define HAVE_SYNC_INTRINSICS 1 |
| #endif |
| |
| |
| /* |
| * void __cilkrts_fence(void) |
| * |
| * Executes an MFENCE instruction to serialize all load and store instructions |
| * that were issued prior the MFENCE instruction. This serializing operation |
| * guarantees that every load and store instruction that precedes the MFENCE |
| * instruction is globally visible before any load or store instruction that |
| * follows the MFENCE instruction. The MFENCE instruction is ordered with |
| * respect to all load and store instructions, other MFENCE instructions, any |
| * SFENCE and LFENCE instructions, and any serializing instructions (such as |
| * the CPUID instruction). |
| */ |
| #ifdef HAVE_SYNC_INTRINSICS |
| # define __cilkrts_fence() __sync_synchronize() |
| #elif defined __ICC || defined __GNUC__ |
| /* mfence is a strict subset of lock add but takes longer on many |
| * processors. */ |
| // # define __cilkrts_fence() __asm__ volatile ("mfence") |
| /* On MIC, fence seems to be completely unnecessary. |
| * Just for simplicity of 1st implementation, it defaults to x86 */ |
| # define __cilkrts_fence() __asm__ volatile ("lock addl $0,(%rsp)") |
| // #elif defined _WIN32 |
| // # pragma intrinsic(_ReadWriteBarrier) |
| // # define __cilkrts_fence() _ReadWriteBarrier() |
| #else |
| COMMON_SYSDEP void __cilkrts_fence(void); ///< MFENCE instruction |
| #endif |
