[PATCH RFA MIPS] Prohibit vector modes in accumulators

[Moore, Catherine]

> -----Original Message-----
> From: Matthew Fortune [mailto:Matthew.Fortune@imgtec.com]
> Sent: Tuesday, January 27, 2015 7:19 AM
> To: Richard Sandiford
> Cc: Robert Suchanek; gcc-patches@gcc.gnu.org; Moore, Catherine
> Subject: RE: [PATCH RFA MIPS] Prohibit vector modes in accumulators
> 
> Richard Sandiford <rdsandiford@googlemail.com> writes:
> > Matthew Fortune <Matthew.Fortune@imgtec.com> writes:
> > >> 2015-01-23  Robert Suchanek  <robert.suchanek@imgtec.com>
> > >>
> > >> 	* config/mips/mips.c (mips_hard_regno_mode_ok_p): Prohibit
> > >> accumulators
> > >> 	for all vector modes.
> > >
> > > This seems like a genuine bug and although it can only be triggered
> > > by loongson or paired-single support it probably qualifies for fixing.
> >
> > Agreed FWIW.  We shouldn't mark something as valid for a mode if even
> > the mode's move pattern can't handle it.
> >
> > I think this kind of thing should go in regardless of development stage.
> 
> Given that it was one of the pre-existing tests that failed I'm happy that we
> are covering this issue. All of these LRA related issues are likely to phase in
> and out with subtle changes to code-gen so I don't think we can always get a
> test case that fails on trunk.
> 
That's true.

> Since Catherine asked for further info then I will leave her to say if she is
> happy to accept on this basis.
> 

I withdraw my request for a testcase.

Catherine