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Re: [PATCH v2] Work around the NOP issue of Loongson2F
On Mon, 16 Nov 2009, Richard Sandiford wrote:
> > Per Richard's suggestion (which I second) please name the option
> > -mfix-loongson2f and adjust all the corresponding variables, etc.
> > accordingly.
> Wu Zhangjin was right; I was actually suggesting -mfix-loongson2f-nop.
> I've no problem subdividing -mfix-* options based on specific errata
> like this, especially given that new versions of the processor are
> free from it.
Ah, I misunderstood, sorry.
I'd be a little bit worried about proliferating options to handle
processor errata and actually I take the fact that current steppings have
been fixed as an argument against it (because you need no -mfix-* option
for these to run code correctly). In particular -- if we get more such
specific options, will one have to specify all of them explicitly to
gurantee predictable behaviour of all the members of the CPU family, or
will there be a global -mfix-loongson2f setting to cover all of of the
errata? The former will not scale -- you'll have to tweak Makefiles, etc.
whenever a new erratum is discovered. The latter has a problem with
negatives that'll require complex handling. I'm using loongson2f as an
example here of course -- that's a general concern of any such option.
I'm not going to defend my stand fiercely though -- I just wanted to make
sure such concerns were taken into account -- and you are the maintainer
to decide, after all.