1 files changed, 123 insertions, 0 deletions
diff --git a/libcilkrts/runtime/config/x86/os-unix-sysdep.c b/libcilkrts/runtime/config/x86/os-unix-sysdep.c
new file mode 100644
index 00000000000..881bc3f4283
--- /dev/null
+++ b/libcilkrts/runtime/config/x86/os-unix-sysdep.c
@@ -0,0 +1,123 @@
+/* os-unix-sysdep.c                  -*-C-*-
+ *
+ *************************************************************************
+ *
+ *  @copyright
+ *  Copyright (C) 2009-2013, Intel Corporation
+ *  All rights reserved.
+ *  
+ *  @copyright
+ *  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.
+ *  
+ *  @copyright
+ *  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.
+ *************************************************************************
+ *
+ * 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;
+}
+
+
+/*
+ * 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
+    __asm__ ( "ldmxcsr %0\n\t"
+              "fnclex\n\t"
+              "fldcw %1"
+              :
+              : "m" (sf->mxcsr), "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)
+    {
+        __asm__ ("stmxcsr %0" : "=m" (sf->mxcsr));
+        __asm__ ("fnstsw %0" : "=m" (sf->fpcsr));
+    }
+#endif
+}
+