Re: Weird behavior of nested functions

[Marco Gerards]

Jeroen Dekkers <address@hidden> writes:

> On Mon, Nov 10, 2003 at 03:42:17PM +0100, Jeroen Dekkers wrote:
> > On Mon, Nov 10, 2003 at 10:10:52AM +0100, Yoshinori K. Okuji wrote:
> > > On Monday 10 November 2003 00:11, Marco Gerards wrote:
> > > > Is it possible that some object files for the utils and pupa mix up?
> > > 
> > > No. The files in utils are compiled without -mrtd or -mregparm, because 
> > > otherwise they are incompatible against your C library. So it is 
> > > necessary to 
> > > compile files in PUPA in per-target basis.
> > > 
> > > BTW, are you good at reading assembly code generated by GCC? For this 
> > > kind of 
> > > problem, it is inevitable to take a look at what GCC produced. I myself 
> > > will 
> > > try your code as soon as possible.
> > 
> > It's a gcc bug triggered by the combination of -mregparm=3 and nested
> > functions. The problem is that it wants to put the address of test in
> > %ecx but that register is also used for the third argument with
> > -mregparm=3. Below is a copy of the assembly code generated by gcc.
> 
> And the bug is already reported by somebody else:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12329

This is interesting.  According to this bug report the problem is in
CX, the third register.

What about this option, in addition to the possible workarounds I
proposed in my previous mail?:

- Use -mregparm=2 instead of -mregparm=3.

(I've tried that and it works)

Thanks,
Marco