comparison DEPENDENCIES/generic/include/boost/multiprecision/detail/bitscan.hpp @ 101:c530137014c0

Update Boost headers (1.58.0)

 // Comparison operators for cpp_int_backend:
 //
 #ifndef BOOST_MP_DETAIL_BITSCAN_HPP
 #define BOOST_MP_DETAIL_BITSCAN_HPP
 
+#if defined(BOOST_MSVC) && (defined(_M_IX86) || defined(_M_X64))
+#include <Intrin.h>
+#endif
+
 namespace boost{ namespace multiprecision{ namespace detail{
 
 template <class Unsigned>
 inline unsigned find_lsb(Unsigned mask, const mpl::int_<0>&)
 {

    }
    return --index;
 }
 
 #if defined(BOOST_MSVC) && (defined(_M_IX86) || defined(_M_X64))
+
+#pragma intrinsic(_BitScanForward,_BitScanReverse)
+
 BOOST_FORCEINLINE unsigned find_lsb(unsigned long mask, const mpl::int_<1>&)
 {
    unsigned long result;
    _BitScanForward(&result, mask);
    return result;

    unsigned long result;
    _BitScanReverse(&result, mask);
    return result;
 }
 #ifdef _M_X64
+
+#pragma intrinsic(_BitScanForward64,_BitScanReverse64)
+
 BOOST_FORCEINLINE unsigned find_lsb(unsigned __int64 mask, const mpl::int_<2>&)
 {
    unsigned long result;
    _BitScanForward64(&result, mask);
    return result;