[Bug libstdc++/54869] ext/random/simd_fast_mersenne_twister_engine/cons/default.cc FAILs

[ro at CeBiTec dot Uni-Bielefeld.DE]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54869

--- Comment #11 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> 2012-10-09 15:05:31 UTC ---
> --- Comment #4 from Ulrich Drepper <drepper.fsp at gmail dot com>
> 2012-10-09 11:23:41 UTC ---
> (In reply to comment #0)
>> The new ext/random/simd_fast_mersenne_twister_engine/cons/default.cc testcase
>> FAILs on Solaris/SPARC (both 32 and 64-bit):
>
> That's expected.  I mentioned when I posted the patches that the implementation
> is for little endian machines.  I don't have access to any big endian machines
> and therefore didn't even try to make it work.
>
> It might be sufficient, at end of _M_gen_rand, to swap the order of the four
> 32-bit words in a 128-bit word.  I never tested this, someone else will have to
> do this.

I'm not familiar with the code at all.  Could you provide a tentative
patch for me to try?

Thanks.
        Rainer