[Bug regression/56738] [4.9 Regression] ICE in c-c++-common/torture/vshuf-v4di.c

steven at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Wed Mar 27 23:45:00 GMT 2013


Steven Bosscher <steven at gcc dot gnu.org> changed:

           What    |Removed                     |Added
                 CC|                            |steven at gcc dot gnu.org

--- Comment #4 from Steven Bosscher <steven at gcc dot gnu.org> 2013-03-27 23:45:01 UTC ---

Index: df-scan.c
--- df-scan.c   (revision 197180)
+++ df-scan.c   (working copy)
@@ -1158,8 +1158,17 @@ df_insn_delete (rtx insn)
      In any case, we expect BB to be non-NULL at least up to register
      allocation, so disallow a non-NULL BB up to there.  Not perfect
      but better than nothing...  */
+  /* ??? bb can also be NULL if lower-subreg.c:resolve_simple_mov emits
+     an insn into a sequence and then does delete_insn on it.  Not sure
+     if that makes sense, but for now it means this assert cannot work.
+     See PR56738.
+     Disable for now but revisit before the end of GCC 4.9 stage1.  */
+#if 0
   gcc_checking_assert (bb != NULL || reload_completed);
+  if (bb == NULL)
+    return;

   df_grow_bb_info (df_scan);
   df_grow_reg_info ();

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