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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/102147] IRA dependent on 32-bit vs 64-bit
 pointer size
Date: Wed, 01 Sep 2021 08:34:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102147

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Well, ira_conflict_vector_profitable_p is dependent on sizeof (ira_object_t)
but it's a decision about the representation of conflicts.  The question is=
 now
whether at any point processing of the two representations can yield differ=
ent
answers.  That might happen if we somewhere iterate over conflicts?

I suppose the simplest fix for the actual bootstrap issue is to make
ira_conflict_vector_profitable_p independent of sizeof (ira_object_t)
and sizeof (IRA_INT_TYPE) and simplify

  return (2 * sizeof (ira_object_t) * (num + 1)
          < 3 * nw * sizeof (IRA_INT_TYPE));

for example to

  return (2 * (num + 1) < 3 * nw);

(note 'nw' is also rounded up to IRA_INT_BITS).=