Date: Thu, 3 Jun 1999 21:22:17 +0200
To: pgcc AT delorie DOT com
Subject: Re: Random i386 patches.
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In-Reply-To: <19990603154857.01824@atrey.karlin.mff.cuni.cz>; from Jan Hubicka on Thu, Jun 03, 1999 at 03:48:57PM +0200
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From: Marc Lehmann <pcg AT goof DOT com>
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On Thu, Jun 03, 1999 at 03:48:57PM +0200, Jan Hubicka wrote:
> > * your long mov patch was broken (argument mismtach in singlemove).
> Oops... I will take a look for it and update it (at least for egcs)

The version in pgcc cvs is fixed (i.e. it inhibits the optimization in
that case).

> > * pgcc still generates movdf mem <- const insns so movdf with
> >   i387_register_operand does not work.
> Huh. I don't understand what do you mean...

you inihibit constants in the movdf pattern after reload, yet these
pattersn exist (and cause the compiler to not abort).

> > * your patch to movdf_push is broken.
> > * and, well one patch contained HTML :(
> Oops.. I was getting them from egcs mailing list archives and I probably
> didn't got rid of those html tags completely...

The weird thing is that only < was escaped, whereas & was not. Shoddy list
archive ;)

> > I also removed the subl => pushl peephole from pgcc (the 4 byte one, not
> > the 8 byte one).
> I've done some tests with translating sobl-> two pushes and at least on my
> Pentium, it don't help...

How have you tested? In my (limited) tests it was slightly faster since it
avoids possible agis when arguments are fetched.

> > How about doing this for pops as well? ;)
> Hmm... you need some register to pop into. Any idea where to get it?

If I had one... Maybe one could scan for REG_DEAD notes (these should be
valid in current egcs and pgcc snapshots).

> Yesterday I've done some work, but didn't got very far. I will download
> the patches i386 files and restart next week (I have exams now, so I am
> quite busy)

Then I can only wish you good luck! Ah, you're so good as not to depend on
luck anyway... ;)

> > I'll try to get out a snapshot soon, btw.
> Cool :)

Actually, I buggered Bernhard to do it, and he seems to be already busy
doing it ;)

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