[EMAIL PROTECTED] wrote:
I decided to look into the Yara branch to see if it could even be
bootstrap on PPC (with Yara turned on by default).
Thanks, for the information. It is even a surprise for me that some
tests work correctly for ppc. Last time when I had time and checked ppc
status (a month ago), yara was completely broken on ppc. Therefore I
wrote that yara will not work on ppc for now.
My major focus platform is x86 right now and the first priority task is
to speed Yara up because it is really slow (right now compiler is 3-4%
slower with YARA on SPECINT2000). If I approach the speed of the
current gcc compiler (my goal is 1-1.5% compiler time degradation when
yara is used), I can say that the project will have a chance to be
successful. Although I can say YARA now is much more faster than the
new register allocator (-fnew-ra) in previous versions of gcc.
As for x86, it is a good platform to work on most register allocator
tasks. One big problem is still waiting for a solution. It is a
dealing with constraint on the displacement size (x86 has no such
problem). Another smaller problem is a good allocation when many
hard-registers used in RTL (e.g. for x86_64).
My feeling is that YARA is a long project. Just removing reload is a
big task by itself. So please don't expect soon that it will be working
for other platforms except x86. Many things should be done also to get
a decent code for other platforms (rematerialization, register pressure
relief, better register preferrencing, different tunning). Also a big
problem is a generation of full debugging information (pseudo in yara
can live in different locations - memory, different registers which is
quite different from the current allocator). This problem is also
waiting for a solution.
Vlad
