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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99863] [10/11 Regression] wrong code with -O
 -fno-tree-forwprop -mno-sse2
Date: Thu, 01 Apr 2021 09:58:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99863

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 6da66985ad6..1f417a52702 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -5231,6 +5231,7 @@ gimplify_init_constructor (tree *expr_p, gimple_seq
*pre_p, gimple_seq *post_p,
                                                       TREE_TYPE (ce->value=
)))
              TREE_STATIC (ctor) =3D 0;
          }
+       recompute_constructor_flags (ctor);
        if (!is_gimple_reg (TREE_OPERAND (*expr_p, 0)))
          TREE_OPERAND (*expr_p, 1) =3D get_formal_tmp_var (ctor, pre_p);
       }

simplifies the IL (vector lowering was supposed to simplify the element
extraction but GENERIC match.pd folding is confused about TREE_SIDE_EFFECTS
on the vector CTOR).  It still nicely triggers the bug though.=