import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / atomic / src / cpuid.hpp

diff --git a/ceph/src/boost/libs/atomic/src/cpuid.hpp b/ceph/src/boost/libs/atomic/src/cpuid.hpp
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+++ b/ceph/src/boost/libs/atomic/src/cpuid.hpp
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+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Copyright (c) 2020 Andrey Semashev
+ */
+/*!
+ * \file   cpuid.hpp
+ *
+ * This file contains declaration of \c cpuid function
+ */
+
+#ifndef BOOST_ATOMIC_CPUID_HPP_INCLUDED_
+#define BOOST_ATOMIC_CPUID_HPP_INCLUDED_
+
+#include <boost/predef/architecture/x86.h>
+
+#if BOOST_ARCH_X86
+
+#if defined(_MSC_VER)
+#include <intrin.h> // __cpuid
+#endif
+#include <boost/cstdint.hpp>
+#include <boost/atomic/detail/config.hpp>
+
+#include <boost/atomic/detail/header.hpp>
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+//! The function invokes x86 cpuid instruction
+inline void cpuid(uint32_t& eax, uint32_t& ebx, uint32_t& ecx, uint32_t& edx)
+{
+#if defined(__GNUC__)
+#if (defined(__i386__) || defined(__VXWORKS__)) && (defined(__PIC__) || defined(__PIE__)) && !(defined(__clang__) || (defined(BOOST_GCC) && BOOST_GCC >= 50100))
+    // Unless the compiler can do it automatically, we have to backup ebx in 32-bit PIC/PIE code because it is reserved by the ABI.
+    // For VxWorks ebx is reserved on 64-bit as well.
+#if defined(__x86_64__)
+    uint64_t rbx = ebx;
+    __asm__ __volatile__
+    (
+        "xchgq %%rbx, %0\n\t"
+        "cpuid\n\t"
+        "xchgq %%rbx, %0\n\t"
+            : "+DS" (rbx), "+a" (eax), "+c" (ecx), "+d" (edx)
+    );
+    ebx = static_cast< uint32_t >(rbx);
+#else // defined(__x86_64__)
+    __asm__ __volatile__
+    (
+        "xchgl %%ebx, %0\n\t"
+        "cpuid\n\t"
+        "xchgl %%ebx, %0\n\t"
+            : "+DS" (ebx), "+a" (eax), "+c" (ecx), "+d" (edx)
+    );
+#endif // defined(__x86_64__)
+#else
+    __asm__ __volatile__
+    (
+        "cpuid\n\t"
+            : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx)
+    );
+#endif
+#elif defined(_MSC_VER)
+    int regs[4] = {};
+    __cpuid(regs, eax);
+    eax = regs[0];
+    ebx = regs[1];
+    ecx = regs[2];
+    edx = regs[3];
+#else
+#error "Boost.Atomic: Unsupported compiler, cpuid instruction cannot be generated"
+#endif
+}
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ARCH_X86
+
+#endif // BOOST_ATOMIC_CPUID_HPP_INCLUDED_