* Re: Loop unrolling and asm
[not found] <199803100938.KAA18441@lslsun17.epfl.ch>
@ 1998-03-10 7:15 ` H.J. Lu
1998-03-11 11:32 ` Richard Henderson
0 siblings, 1 reply; 2+ messages in thread
From: H.J. Lu @ 1998-03-10 7:15 UTC (permalink / raw)
To: Christian Iseli; +Cc: egcs, gas2
>
> Hi folks,
>
> While trying out egcs-1.0.2-prerelease, I compiled the
> new XFree86-3.3.2 on a Linux 2.1.88 (RH 5.0) PPro box.
> binutils-2.8.(...).21 is installed.
>
> I used -O2 -march=i686 -funroll-loops to compile XFree.
> I encountered a small problem where a loop containing asm
> was unrolled. The asm included labels (.label00, .label01, ...)
> and the assembler died because of multiple definitions of
> the labels.
>
> The problem, of course, went away when I recompiled the incriminated
> file without loop unrolling.
>
> XFree seems to run fine.
>
> Now the question: how do you go about including an asm with labels
> in a loop that will be unrolled?
>
Use 0f, 1f, .... 9f, 0b, .... 9b instead of .label00 in asm. But
At one time, I needed more than 10 lables backward/forward. I had
to disable inline. I think it is limited by binutils. Can we change
binutils to accept more than 10 local lables?
--
H.J. Lu (hjl@gnu.org)
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