[Bug rtl-optimization/42511] [4.5 Regression] bootstrap error in stage3 on alpha-linux-gnu

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #18 from ubizjak at gmail dot com  2010-01-06 23:16 -------
Following patch changes the fix from PR21767 to remove REG_EQUAL notes from all
moved instructions, not only from ones that have non-function-invariant
sources.

--cut here--
Index: ifcvt.c
===================================================================
--- ifcvt.c     (revision 155681)
+++ ifcvt.c     (working copy)
@@ -4079,15 +4079,12 @@ dead_or_predicable (basic_block test_bb,
       insn = head;
       do
        {
-         rtx note, set;
+         rtx note;

          if (! INSN_P (insn))
            continue;
          note = find_reg_note (insn, REG_EQUAL, NULL_RTX);
-         if (! note)
-           continue;
-         set = single_set (insn);
-         if (!set || !function_invariant_p (SET_SRC (set)))
+         if (note)
            remove_note (insn, note);
        } while (insn != end && (insn = NEXT_INSN (insn)));

--cut here--

Matthias, can you please test this patch if it fixes bootstrap for you?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42511