[RS6000] Fix 65576 regression

[Alan Modra]

On Thu, Apr 02, 2015 at 01:03:19PM -0400, David Edelsohn wrote:
> On Thu, Apr 2, 2015 at 1:22 AM, Alan Modra <amodra@gmail.com> wrote:
> > This cures an unrecognizable insn ICE by modifying a predicate of
> > extenddftf2_internal (the only place this predicate is used) to ensure
> > that rtl optimization passes do not substitute 0.0 for a register with
> > known 0.0 value, except when VSX is enabled.  ie. Don't undo the
> > necessary register move emitted by the extenddftf2_fprs expander.
> > Bootstrapped and regression tested powerpc64le-linux, powerpc64-linux
> > and powerpc-linux.  OK to apply?
> >
> >         PR target/65576
> >         PR target/65240
> >         * config/rs6000/predicates.md (zero_reg_mem_operand): Exclude
> >         0.0 constant unless TARGET_VSX.
> 
> This change seems to disable the final alternative in the
> extenddftf2_internal pattern.

It looks to me like it was already disabled, by r96390.

-- 
Alan Modra
Australia Development Lab, IBM