[Bug target/67002] [5] [SH]: Bootstrap stage 2/3 comparison failure - gcc/real.o differs

[kkojima at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67002

--- Comment #19 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
(In reply to Kazumoto Kojima from comment #18)
In the problematic situation, get_max_insn_count returns the false
value after

  if (MAY_HAVE_DEBUG_INSNS)
    expand_debug_locations ();

in pass_expand::execute (function *fun).  expand_debug_locations
calls sh_recog_treg_set_expr indirectly at this very early stage
to compute rtx costs.  sh_recog_treg_set_expr makes some set insns
and they cause the differences of cur_insn_uid with -g.  Oleg, how
about the patch below?  My first trial was --cur_insn_uid just
after make_insn_raw there but I'm afraid that it will make another
surprise.

diff --git a/config/sh/sh.c b/config/sh/sh.c
index f429193..450d634 100644
--- a/config/sh/sh.c
+++ b/config/sh/sh.c
@@ -14165,6 +14165,12 @@ sh_recog_treg_set_expr (rtx op, machine_mode mode)
   if (!can_create_pseudo_p ())
     return false;

+  /* expand_debug_locations may call this to compute rtx costs at
+     very early stage.  In that case, don't make new insns here to
+     avoid codegen differences with -g. */
+  if (currently_expanding_to_rtl)
+    return false;
+
   /* We are going to invoke recog in a re-entrant way and thus
      have to capture its current state and restore it afterwards.  */
   recog_data_d prev_recog_data = recog_data;