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/* os-unix-sysdep.c -*-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.
*************************************************************************
*
* This file contains system-specific code for Unix systems
*/
#include "os.h"
#include "sysdep.h"
#include <internal/abi.h>
// On x86 processors (but not MIC processors), the compiler generated code to
// save the FP state (rounding mode and the like) before calling setjmp. We
// will need to restore that state when we resume.
#ifndef __MIC__
# if defined(__i386__) || defined(__x86_64)
# define RESTORE_X86_FP_STATE
# endif // defined(__i386__) || defined(__x86_64)
#endif // __MIC__
/* timer support */
COMMON_SYSDEP unsigned long long __cilkrts_getticks(void)
{
#if defined __i386__ || defined __x86_64
unsigned a, d;
__asm__ volatile("rdtsc" : "=a" (a), "=d" (d));
return ((unsigned long long)a) | (((unsigned long long)d) << 32);
#else
# warning "unimplemented cycle counter"
return 0;
#endif
}
COMMON_SYSDEP void __cilkrts_short_pause(void)
{
#if __ICC >= 1110
# if __MIC__ || __MIC2__
_mm_delay_32(16); // stall for 16 cycles
# else
_mm_pause();
# endif
#elif defined __i386__ || defined __x86_64
__asm__("pause");
#else
# warning __cilkrts_short_pause empty
#endif
}
COMMON_SYSDEP int __cilkrts_xchg(volatile int *ptr, int x)
{
#if defined __i386__ || defined __x86_64
/* asm statement here works around icc bugs */
__asm__("xchgl %0,%a1" :"=r" (x) : "r" (ptr), "0" (x) :"memory");
#else
x = __sync_lock_test_and_set(ptr, x);
#endif
return x;
}
/*
* The Intel compiler distribution assumes newer CPUs and doesn't yet support
* the __builtin_cpu_supports intrinsic added by GCC 4.8, so just return 1 in
* that environment.
*
* This declaration should generate an error when the Intel compiler adds
* supprt for the intrinsic.
*/
#if defined(__INTEL_COMPILER) || defined(__clang__)
static inline int __builtin_cpu_supports(const char *feature)
{
return 1;
}
#endif
/*
* Restore the floating point state that is stored in a stack frame at each
* spawn. This should be called each time a frame is resumed.
*
* Only valid for IA32 and Intel64 processors.
*/
void restore_x86_fp_state (__cilkrts_stack_frame *sf) {
#ifdef RESTORE_X86_FP_STATE
if (__builtin_cpu_supports("sse"))
{
__asm__ ("ldmxcsr %0"
:
: "m" (sf->mxcsr));
}
__asm__ ("fnclex\n\t"
"fldcw %0"
:
: "m" (sf->fpcsr));
#endif
}
void sysdep_save_fp_ctrl_state(__cilkrts_stack_frame *sf)
{
// If we're not going to restore, don't bother saving it
#ifdef RESTORE_X86_FP_STATE
if (CILK_FRAME_VERSION_VALUE(sf->flags) >= 1)
{
if (__builtin_cpu_supports("sse"))
{
__asm__ ("stmxcsr %0" : "=m" (sf->mxcsr));
}
__asm__ ("fnstcw %0" : "=m" (sf->fpcsr));
}
#endif
}
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