Re: [PATCH][PR target/97540] Don't extract memory from operand for normal memory constraint.

[Hongtao Liu <crazylht@gmail.com>]

On Tue, Nov 3, 2020 at 9:51 PM Richard Sandiford
<richard.sandiford@arm.com> wrote:
>
> Vladimir Makarov via Gcc-patches <gcc-patches@gcc.gnu.org> writes:
> > On 2020-10-27 2:53 a.m., Hongtao Liu wrote:
> >> Hi:
> >>    For inline asm, there could be an operand like (not (mem:)), it's
> >> not a valid operand for normal memory constraint.
> >>    Bootstrap is ok, regression test is ok for make check
> >> RUNTESTFLAGS="--target_board='unix{-m32,}'"
> >>
> >> gcc/ChangeLog
> >>          PR target/97540
> >>          * ira.c: (ira_setup_alts): Extract memory from operand only
> >>          for special memory constraint.
> >>          * recog.c (asm_operand_ok): Ditto.
> >>          * lra-constraints.c (process_alt_operands): MEM_P is
> >>          required for normal memory constraint.
> >>
> >> gcc/testsuite/ChangeLog
> >>          * gcc.target/i386/pr97540.c: New test.
> >>
> > I understand Richard's concerns and actually these concerns were my
> > motivations to constraint possible cases for extract_mem_from_operand in
> > the original patch introducing the function.
> >
> > If Richard proposes a better solution we will reconsider the current
> > approach and revert the changes if it is necessary.
> >
> > Meanwhile I am approving this patch.  I hope it will not demotivate
> > Richard's attempt to find a better solution.
>
> OK, that's fine with me.  I might come back to this next stage 1,
> depending on how things turn out.
>
> Richard

Thanks for all your comments, patch committed.
And I'm not going to add "Br" to more patterns until the final
solution is in place.

-- 
BR,
Hongtao