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From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/102285] New flag -ftrivial-auto-var-init=zero causes
 crash in pr82421.c
Date: Mon, 04 Oct 2021 17:16:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102285

--- Comment #25 from qinzhao at gcc dot gnu.org ---
(In reply to Richard Biener from comment #22)
> Hmm, my proposed patch seems to work.  I've adjusted it to not regress
> previously correctly handled cases and will test it fully.

I guess the reason for it worked for you because you tested it after the pa=
tch
for 102587?

--- a/gcc/internal-fn.c
+++ b/gcc/internal-fn.c
@@ -3035,7 +3035,8 @@ expand_DEFERRED_INIT (internal_fn, gcall *stmt)
       /* Expand this memset call.  */
       expand_builtin_memset (m_call, NULL_RTX, TYPE_MODE (var_type));
     }
-  else
+  /* ???  Deal with poly-int sized registers.  */
+  else if (tree_fits_uhwi_p (TYPE_SIZE_UNIT (var_type)))
     {
       /* If this variable is in a register, use expand_assignment might
         generate better code.  */=