Re: [Valgrind-developers] [PATCH] Valgrind for PowerPC

[Julian S. <js...@ac...>]

>   reported errors a lot.  Glibc seems to like using the add-fefefeff
>   and or-7f7f7f7f tricks a lot.  I have a formula for getting the
>   valid bits for the result of an ADD exactly without too much effort.

Ha!  Tell me what it is (pretty please).  I have been wondering how to do
that for a long time, without success, since it would also improve accuracy
on x86.

> * I punted on VG_(saneUInstr) for now.  I really should go back and
>   fill in the parts for the new UInstrs I added.

Yes ... do.  You'd be amazed how many hours of debugging saneUInstr
has saved us collectively.

J