------- Additional Comments From bonzini at gcc dot gnu dot org  2005-07-14 
08:45 -------
> But I don't see immediately how reload could be convinced to do so  
> automatically, as the choice of the reload class for one insn is independend  
> from the choices of reloads for the same reg but in other insns.  

We can use PREFERRED_RELOAD_CLASS and PREFERRED_OUTPUT_RELOAD_CLASS.  I am not
sure if the fix is over-eager, but it works great on libsse2.  Every fld that
was there disappears, and from a cursory check, in current mainline's code all
of them could have been inherited.

Patches are at:
- http://gcc.gnu.org/ml/gcc-patches/2005-07/msg00914.html (regclass)
- http://gcc.gnu.org/ml/gcc-patches/2005-07/msg00983.html (reload+i386)

It is also necessary to remove from the MD the `#' hints for regclass, with

  sed -i 's/#[^",\][^",]*\([",]\)/\1/g' i386.md

Paolo

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19653

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