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Re: [patch] MIPS gas problems with gcc's explicit relocs
On Fri, 28 May 2004, Thiemo Seufer wrote:
> > > Maciej W. Rozycki wrote:
> > > [snip]
> > >> asm("dla\t%0,%1" : "=r" (result) : "m" (foo));
> > > [snip]
> > >> lui $2,%highest(foo)
> > >> daddiu $2,$2,%higher(foo)
> > >> dsll $2,$2,16
> > >> daddiu $2,$2,%hi(foo)
> > >> dsll $2,$2,16
> > >> #APP
> > >> dla $2,%lo(foo)($2)
> > >> #NO_APP
> > >
> > > IMHO this is broken in the compiler. It should either only provide the
> > > sympol for %1, or handle the dla expansion correctly, preferably with
> > > better optimization for superscalar processors (that is, a
> > > lui - lui - daddiu - daddiu - dsll32 - daddu sequence).
> >
> > Huh? This is an asm statement; the compiler has no idea that it's a
> > dla instruction.
>
> AFAICS it tries to alter it.
It merely substitutes "$2" for "%0" and "%lo(foo)($2)" for "%1".
--
+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+--------------------------------------------------------------+
+ e-mail: macro@ds2.pg.gda.pl, PGP key available +