[PATCH 2/2] [ARM] Add support for -mpure-code in thumb-1 (v6m)

[Christophe Lyon]

On Tue, 12 Nov 2019 at 12:17, Richard Earnshaw (lists)
<Richard.Earnshaw@arm.com> wrote:
>
> On 18/10/2019 14:18, Christophe Lyon wrote:
> > +thumb1_gen_const_int (rtx op0, HOST_WIDE_INT op1)
> > +{
> > +  bool mov_done_p = false;
> > +  int i;
> > +
> > +  /* Emit upper 3 bytes if needed.  */
> > +  for (i = 0; i < 3; i++)
> > +    {
> > +      int byte = (op1 >> (8 * (3 - i))) & 0xff;
> > +
> > +      if (byte)
> > +     {
> > +       emit_set_insn (op0, mov_done_p
> > +                      ? gen_rtx_PLUS (SImode,op0, GEN_INT (byte))
> > +                      : GEN_INT (byte));
> > +       mov_done_p = true;
> > +     }
> > +
> > +      if (mov_done_p)
> > +     emit_set_insn (op0, gen_rtx_ASHIFT (SImode, op0, GEN_INT (8)));
> > +    }
> > +
> > +  /* Emit lower byte if needed.  */
> > +  if (!mov_done_p)
> > +    emit_set_insn (op0, GEN_INT (op1 & 0xff));
> > +  else if (op1 & 0xff)
> > +    emit_set_insn (op0, gen_rtx_PLUS (SImode, op0, GEN_INT (op1 & 0xff)));
> > +}
> > +
>
> What about Armv8-m.baseline, which has movw/movt?
>
This is already supported since r247585 (May 2017) "[ARM] Enable
Purecode for ARMv8-M Baseline" AFAICT.

Thanks,

Christophe

> R.