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      1 //===-- xray_x86_64.inc -----------------------------------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file is a part of XRay, a dynamic runtime instrumentation system.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include <cstdint>
     15 #include <x86intrin.h>
     16 
     17 #include "sanitizer_common/sanitizer_internal_defs.h"
     18 #include "xray_defs.h"
     19 
     20 namespace __xray {
     21 
     22 ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT {
     23   unsigned LongCPU;
     24   unsigned long Rax, Rdx;
     25   __asm__ __volatile__("rdtscp\n" : "=a"(Rax), "=d"(Rdx), "=c"(LongCPU) ::);
     26   CPU = LongCPU;
     27   return (Rdx << 32) + Rax;
     28 }
     29 
     30 uint64_t getTSCFrequency();
     31 
     32 bool probeRequiredCPUFeatures();
     33 
     34 } // namespace __xray
     35