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Re: Should we remove java from the default bootstrap languages?
* Ian Lance Taylor wrote on Sun, Jun 22, 2008 at 04:42:19PM CEST:
>
> First I'll note that insn-attrtab.c is particularly slow for
> x86/x86_64, presumably due to the many processor varieties and complex
> scheduling. It is much faster for other targets.
>
> Compiling it earlier than it would otherwise be does work. The
> problem is that insn-attrtab.o depends on the generated file
> insn-attr.h. GNU make works by making a pass over the targets, and it
> builds all the ones whose dependencies are already built. Then it
> makes another pass. The effect is that all the objects which do not
> depend upon insn-attr.h wind up getting built before insn-attrtab.o.
>
> We could game the system to force insn-attrtab.o to be compiler even
> earlier by adding false dependencies in the Makefile.
I would be surprised if just dependency ordering could improve things
for insn-attrtab on trunk further than this patch (a variant of which
was committed to trunk on 2008-04-03):
<http://gcc.gnu.org/ml/gcc-patches/2008-03/msg01888.html>
> A cleaner approach would be to somehow change genattrtab.c [...]
That sounds like the next logical step to me.
Cheers,
Ralf