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Use BitScanReverse intrinsic also in floor_log2 also in MSVC 7.1 and avoid including "intrin.h"

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This commit is contained in:
Ion Gaztañaga 2014-02-08 12:15:23 +01:00
parent 4f60ed75b5
commit e2deea0630
1 changed files with 31 additions and 21 deletions
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52
include/boost/intrusive/detail/utilities.hpp
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@ -366,22 +366,45 @@ void destructor_impl(Hook &, detail::link_dispatch<normal_link>)
// floor_log2 Dispatcher
////////////////////////////
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
#if defined(_MSC_VER) && (_MSC_VER >= 1300)
}}} //namespace boost::intrusive::detail
#include <intrin.h>
//Use _BitScanReverseXX intrinsics
#if defined(_M_X64) || defined(_M_AMD64) || defined(_M_IA64) //64 bit target
#define BOOST_INTRUSIVE_BSR_INTRINSIC_64_BIT
#endif
#ifndef __INTRIN_H_ // Avoid including any windows system header
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
#if defined(BOOST_INTRUSIVE_BSR_INTRINSIC_64_BIT) //64 bit target
unsigned char _BitScanReverse64(unsigned long *index, unsigned __int64 mask);
#pragma intrinsic(_BitScanReverse64)
#else //32 bit target
unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);
#pragma intrinsic(_BitScanReverse)
#endif
#ifdef __cplusplus
}
#endif // __cplusplus
#endif // __INTRIN_H_
#ifdef BOOST_INTRUSIVE_BSR_INTRINSIC_64_BIT
#define BOOST_INTRUSIVE_BSR_INTRINSIC _BitScanReverse64
#undef BOOST_INTRUSIVE_BSR_INTRINSIC_64_BIT
#else
#define BOOST_INTRUSIVE_BSR_INTRINSIC _BitScanReverse
#endif
namespace boost {
namespace intrusive {
namespace detail {
#if defined(_M_X64) || defined(_M_AMD64) || defined(_M_IA64) //64 bit target
#define BOOST_INTRUSIVE_BSR_INTRINSIC _BitScanReverse64
#else //32 bit target
#define BOOST_INTRUSIVE_BSR_INTRINSIC _BitScanReverse
#endif
inline std::size_t floor_log2 (std::size_t x)
{
unsigned long log2;
@ -391,19 +414,6 @@ void destructor_impl(Hook &, detail::link_dispatch<normal_link>)
#undef BOOST_INTRUSIVE_BSR_INTRINSIC
#elif defined(_MSC_VER) //visual 2003
inline std::size_t floor_log2 (std::size_t x)
{
unsigned long log2;
__asm
{
bsr eax, x
mov log2, eax
}
return static_cast<std::size_t>(log2);
}
#elif defined(__GNUC__) && ((__GNUC__ >= 4) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) //GCC >=3.4
#if SIZE_MAX > UINT_MAX