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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/99689] Initialized local variable becomes
 uninitialized after use
Date: Wed, 28 Feb 2024 07:26:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99689

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 9.3.0 says:
/app/example.cpp:19:18: missed:   can't use a fully-masked loop because the
target doesn't have the appropriate masked load or store.
/app/example.cpp:19:18: note:   vect_model_load_cost: aligned.
/app/example.cpp:19:18: note:   vect_model_load_cost: inside_cost =3D 2,
prologue_cost =3D 0 .
/app/example.cpp:19:18: note:   =3D=3D> examining statement: _2 =3D (unsign=
ed int)
_24;
/app/example.cpp:19:18: note:   vect_is_simple_use: operand # VUSE <.MEM_12>
MEM[(long unsigned intD.17 *)SR.139_80 + 8B], type of def: internal
...

But GCC 9.4.0 says:
/app/example.cpp:19:18: missed:   not falling back to elementwise accesses
/app/example.cpp:20:49: missed:   not vectorized: relevant stmt not support=
ed:
_24 =3D MEM[(long unsigned int *)SR.139_80 + 8B];
/app/example.cpp:19:18: missed:  bad operation or unsupported loop bound.
/app/example.cpp:19:18: missed: couldn't vectorize loop
/app/example.cpp:20:49: missed: not vectorized: relevant stmt not supported:
_24 =3D MEM[(long unsigned int *)SR.139_80 + 8B];
/app/example.cpp:9:1: note: vectorized 0 loops in function.=