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Added a workaround for clang 3.4 bug: the compiler does not implement __atomic intrinsics even though it defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 macro.

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This commit is contained in:
Andrey Semashev
2014-03-15 16:11:03 +04:00
parent e4bde20f2e
commit bf1898e2e6
1 changed files with 70 additions and 2 deletions
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72
include/boost/atomic/detail/gcc-atomic.hpp
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@@ -32,6 +32,12 @@ namespace detail {
#define BOOST_ATOMIC_X86_HAS_CMPXCHG16B 1
#endif
#if defined(BOOST_ATOMIC_X86_HAS_CMPXCHG16B) && defined(__clang__)
// Worraround for bug: http://llvm.org/bugs/show_bug.cgi?id=19149
// Clang 3.4 does not implement 128-bit __atomic* intrinsics even though it defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
#define BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS
#endif
BOOST_FORCEINLINE BOOST_CONSTEXPR int convert_memory_order_to_gcc(memory_order order) BOOST_NOEXCEPT
{
return (order == memory_order_relaxed ? __ATOMIC_RELAXED : (order == memory_order_consume ? __ATOMIC_CONSUME :
@@ -830,7 +836,7 @@ private:
#endif // defined(BOOST_ATOMIC_LLONG_LOCK_FREE) && BOOST_ATOMIC_LLONG_LOCK_FREE > 0
#if defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0
#if defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0 && !defined(BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS)
template<typename T, bool Sign>
class base_atomic<T, int, 16, Sign>
@@ -1041,7 +1047,7 @@ private:
storage_type v_;
};
#endif // defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0
#endif // defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0 && !defined(BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS)
/* pointers */
@@ -1202,10 +1208,72 @@ private:
#endif // defined(BOOST_ATOMIC_POINTER_LOCK_FREE) && BOOST_ATOMIC_POINTER_LOCK_FREE > 0
#if defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0 && defined(BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS)
template<typename T>
inline bool platform_cmpxchg128_strong(T& expected, T desired, volatile T* ptr) BOOST_NOEXCEPT
{
uint64_t const* p_desired = (uint64_t const*)&desired;
bool success;
__asm__ __volatile__
(
"lock; cmpxchg16b %[dest]\n\t"
"sete %[success]"
: "+A,A" (expected), [dest] "+m,m" (*ptr), [success] "=q,m" (success)
: "b,b" (p_desired[0]), "c,c" (p_desired[1])
: "memory", "cc"
);
return success;
}
template<typename T>
inline void platform_store128(T value, volatile T* ptr) BOOST_NOEXCEPT
{
uint64_t const* p_value = (uint64_t const*)&value;
__asm__ __volatile__
(
"movq 0(%[dest]), %%rax\n\t"
"movq 8(%[dest]), %%rdx\n\t"
".align 16\n\t"
"1: lock; cmpxchg16b 0(%[dest])\n\t"
"jne 1b"
:
: "b" (p_value[0]), "c" (p_value[1]), [dest] "r" (ptr)
: "memory", "cc", "rax", "rdx"
);
}
template<typename T>
inline T platform_load128(const volatile T* ptr) BOOST_NOEXCEPT
{
T value;
// We don't care for comparison result here; the previous value will be stored into value anyway.
// Also we don't care for rbx and rcx values, they just have to be equal to rax and rdx before cmpxchg16b.
__asm__ __volatile__
(
"movq %%rbx, %%rax\n\t"
"movq %%rcx, %%rdx\n\t"
"lock; cmpxchg16b %[dest]"
: "=&A" (value)
: [dest] "m" (*ptr)
: "cc"
);
return value;
}
#endif // defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0 && defined(BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS)
} // namespace detail
} // namespace atomics
} // namespace boost
#if defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0 && defined(BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS)
#undef BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS
#include <boost/atomic/detail/cas128strong.hpp>
#endif // defined(BOOST_ATOMIC_INT128_LOCK_FREE) && BOOST_ATOMIC_INT128_LOCK_FREE > 0 && defined(BOOST_ATOMIC_X86_NO_GCC_128_BIT_ATOMIC_INTRINSICS)
#endif // !defined(BOOST_ATOMIC_FORCE_FALLBACK)
#endif // BOOST_ATOMIC_DETAIL_GCC_ATOMIC_HPP