Re: Internal compiler error in gcc3.0.2 for ppc403

[Daniel Jacobowitz <drow at mvista dot com>]

On Fri, Feb 28, 2003 at 03:19:23PM -0800, Dan Kegel wrote:
> Dan Kegel wrote:
> >I've been using gcc3.0.2 built for ppc403 (patched to
> >support ppc405; see http://www.kegel.com/xgcc3/ )
> >for about a year with no trouble, but compiling kaffe
> >exposed an internal compiler error.  Since updating
> >to a new compiler is a somewhat major effort, I thought
> >I'd post details about it here, and see if anyone knows
> >what version of gcc (if any) fixes this problem before
> >I start trying versions at random.  Here's the compiler
> >error when building kaffe:
> >
> >../../../kaffe-1.0.7-libtool1.4e/kaffe/kaffevm/support.c:1051: Insn does 
> >not satisfy its constraints:
> >(insn 1003 1000 533 (set (reg/v:DF 40 f8 [77])
> >        (mem:DF (plus:SI (reg/f:SI 31 r31)
> >                (const_int 8 [0x8])) 0)) 293 {*movdf_softfloat32} (nil)
> >    (nil))
> >../../../kaffe-1.0.7-libtool1.4e/kaffe/kaffevm/support.c:1051: Internal 
> >compiler error in reload_cse_simplify_operands, at reload1.c:8364
> 
> 
> This probably has to do with the fact that Kaffe is doing
> floating point stuff, but the ppc405 doesn't have floating
> point support:

Correct.  Asm'ing a variable into a floating-point register is going to
make GCC very confused when you tell it that it can't use the floating
point registers.

> http://www.kaffe.org/pipermail/kaffe/2002-October/009100.html
> 
> Sigh.  I guess I should do a better job with google before I post!
> I'm still interested in whether there's a good way to
> make gcc output a more sensible error, if that's all it is.

Not really.  Hmm, perhaps the code for associating a variable with a
fixed register could detect this; I'm not sure we have enough
information to realize that fr1 is unusable.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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