Changes in / [fb16d5c:7ca8441c]


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  • src/Common/utility.h

    rfb16d5c r7ca8441c  
    441441
    442442template<typename T>
    443 inline constexpr T ilog2(const T & t) {
    444         if ( std::is_integral<T>::value ) {
     443inline
     444#if __GNUC__ > 4
     445constexpr
     446#endif
     447T ilog2(const T & t) {
     448        if(std::is_integral<T>::value) {
    445449                const constexpr int r = sizeof(t) * __CHAR_BIT__ - 1;
    446                 if ( sizeof(T) == sizeof(unsigned int ) ) return r - __builtin_clz( t );
    447                 if ( sizeof(T) == sizeof(unsigned long) ) return r - __builtin_clzl( t );
    448                 if ( sizeof(T) == sizeof(unsigned long long) ) return r - __builtin_clzll( t );
    449         } // if
     450                if( sizeof(T) == sizeof(unsigned       int) ) return r - __builtin_clz  ( t );
     451                if( sizeof(T) == sizeof(unsigned      long) ) return r - __builtin_clzl ( t );
     452                if( sizeof(T) == sizeof(unsigned long long) ) return r - __builtin_clzll( t );
     453        }
     454        assert(false);
    450455        return -1;
    451 } // ilong2
     456} // iLog2
    452457
    453458
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