Re: [Tack-devel] arm and powerpc assembly

[David G. <dg...@co...>]

On 06/05/13 18:14, David Given wrote:
[...]
> I have
> actually found these in the working directory and will try to check them
> in soon.

So that's all checked in now... and there was a lot more stuff there
than I expected.

The PowerPC code generator all builds and runs, although I don't know
whether it generates working code; the code quality is pretty dire but
much less bad than I remember. There's a linuxppc plat to put it all
together but trying to build executables fails.

There is *also* a linux68k plat which uses the m68020 code generator.
That's checked in too (and produces quite nice code; the m68k's
addressing modes play nicely with em). As there's now three Linux plat,
I also seem to have factored out a lot of the platform-independent Linux
runtime code into plat/linux.

In addition I found why I never checked all this in. I'd added EM
support for a new opcode, STACKADJUST. This was used to tell ncgg about
changes to (sp-fp), to allow it to calculate fp on-the-fly and not have
to store it in a register.

I recall that all this *worked*... for C. Unfortunately it violated some
core em assumptions which caused the other languages (which used much
more exotic em opcodes) to fail. I notice that this functionality's not
actually used anywhere, so I obviously decided against using it in the
PowerPC code generator. It's also likely to be full of bugs.

Therefore I have not checked this into trunk, and have instead created a
branch for it, dtrg-experimental-powerpc. It probably wants looking at
carefully and piecemeal merging into trunk...

http://tack.hg.sourceforge.net/hgweb/tack/tack/rev/e58c27045378

-- 
┌─── ｄｇ＠ｃｏｗｌａｒｋ．ｃｏｍ ───── http://www.cowlark.com ─────
│
│ "Home is where, when you have to go there, they have to take you in."
│ --- Cordelia Naismith (via Robert Frost)