re: [COMMIT] romcc 0.63 and some fixes...

[YhLu]

linuxbios image is 71069 bytes; only 65536 allowed

after change some print_debug to printo_debug, it gets bigger. Before that
it about 68000.

Regards

YH

-----邮件原件-----
发件人: [e-mail] [mailto:[e-mail]] 
发送时间: 2004年6月7日 14:19
收件人: YhLu
抄送: LinuxBIOS
主题: Re: 答复: 答复: [COMMIT] romcc 0.63 and some fixes...

YhLu  writes:
> I see. The code is getting larger.

Not quite.  There is less generated code, but it requires
extra registers to hold the return addresses so the register
pressure is higher.

Some of that extra register pressure may be artificial and
go away when this bug is fixed.  Some of it may result from
poor choices of the register allocator, and may be remedied
by enhancing the register allocator.  There is hope of
remedies as the kind of code presented to the register
allocator is very different when code is not inlined.
> Also the reboot in OS can not work.

Hmm.  At least with reboot=hard that should work on the Opterons.
I have not tested that lately though.

Eric

[COMMIT] romcc 0.63 and some fixes...

YhLu  writes:
> linuxbios image is 71069 bytes; only 65536 allowed
>
> after change some print_debug to printo_debug, it gets bigger. Before that
> it about 68000.

Ouch.  I guess it must be some of the missed opportunities for
optimization.  Or the increase in moving values around in
registers.

So in theory it works, but we are having a hard time applying it :(

Do you have any significant size regression with just switching to the
new romcc.

Eric