Ondřej Bílka writes:
It is possible enchancement, but I am not yet at stage of calculating
register dependencies on jumps.
That's someting we do, but we only handle a simple jump-back for the
loop.
(That branch limitation is a slght problem for some division loops,
which use an unlikely a
ni...@lysator.liu.se (Niels Möller) writes:
Another feature, which I looked into while ago without getting very far
with the loopmixer, is to make it understand associativity. I.e, try
reordering certain instructions with the same destination register, like
xor %r8, %rax
xor %r9,
On Wed, Oct 02, 2013 at 07:14:24PM +0200, Torbjorn Granlund wrote:
>
> It sounds a lot like David Harvey's and my tool, which we call the
> "loopmixer". We never wrote it neatly enough for public release, but
> we've used it for the last 4 years or so for tweaking the assembly code
> of GMP. (
On Wed, Oct 02, 2013 at 08:19:29PM +0200, Niels Möller wrote:
> Torbjorn Granlund writes:
>
> > We don't handle alternatives currently, except with a loop around the
> > loopmixer. One could think of several classes, some known to the tool,
> > others not-always-valid only by source file annotat
Torbjorn Granlund writes:
> We don't handle alternatives currently, except with a loop around the
> loopmixer. One could think of several classes, some known to the tool,
> others not-always-valid only by source file annotation. Examples of the
> former would be "xor rax,rax" vs "xor eax,eax" a
Ondřej Bílka writes:
I am writing a tool that might be useful, a simple optimizer of assembly
routines. You need to write a benchmark that measures performance and
prints elapsed time and assembly file. Currently it has two optimization
patterns, first is enclosing block of code without c
On Thu, Sep 26, 2013 at 09:20:29PM +0200, Torbjorn Granlund wrote:
> For the last few months, I have been working on writing and rewriting
> basecase code for X64-64 processors. The result is now in the
> mainline GMP repo.
>
I am writing a tool that might be useful, a simple optimizer of assembl
