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From: "hliu at amperecomputing dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110531] Vect: slp_done_for_suggested_uf is
 not initialized in tree-vect-loop.cc
Date: Tue, 04 Jul 2023 09:33:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110531

--- Comment #10 from Hao Liu <hliu at amperecomputing dot com> ---
> foo is just an example for not getting inlined, the point here is extra c=
ost paid.

My point is that the case is different from the original case in
tree-vect-loop.cc.  For example, change the case as following:

__attribute__((noipa)) int foo(int *a) { *a =3D=3D 1 ? return 1 : return 0;}

That's similar to the original problem (the value of "a" is undefiend).

I don't mean that "a" must be initialized in test().  We can also initalize=
 "a"
in foo, but should not use "a" before initialization. E.g.

__attribute__((noipa)) int foo(int *a) {=20
  *a =3D=3D 1;
  ...
  if (*a)
}

The above case has no problem.=