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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101419] [9/10/11/12 Regression] collapsing
 memset() calls can break __builtin_object_size()
Date: Mon, 12 Jul 2021 11:26:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101419

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The above patch will slightly pessimize optimizations during the
      NEXT_PASS (pass_remove_cgraph_callee_edges);
      /* Initial scalar cleanups before alias computation.
         They ensure memory accesses are not indirect wherever possible.  */
      NEXT_PASS (pass_strip_predict_hints, false /* early_p */);
      NEXT_PASS (pass_ccp, true /* nonzero_p */);
      NEXT_PASS (pass_post_ipa_warn);
      /* After CCP we rewrite no longer addressed locals into SSA
         form if possible.  */
      NEXT_PASS (pass_complete_unrolli);
      NEXT_PASS (pass_backprop);
      NEXT_PASS (pass_phiprop);
      NEXT_PASS (pass_forwprop);
passes right after IPA, where we currently only pessimize it before and dur=
ing
IPA.=