Re: optimizing 128bit integer arithmetic on ia32

[Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>]

> inline uint64x64_t &operator += (uint64x64_t &lhs, const  
> uint64x64_t &rhs)
> {
>   lhs._v.hi += rhs._v.hi;
>   lhs._v.lo += rhs._v.lo;
>   if (lhs._v.hi < rhs._v.lo)

if (lhs._v.lo  < rhs._v.lo)

>     {
>       lhs._v.hi++;
>     }
>   return lhs;
> }

Does the generated code look any better with that correction?  If  
not, you
want to tell us the exact command line and GCC version you used.


Segher