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From: "mark at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/63311] [9/10/11/12 Regression] -O1 optimization
 introduces valgrind warning
Date: Tue, 15 Feb 2022 12:09:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D63311

Mark Wielaard <mark at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at gcc dot gnu.org

--- Comment #19 from Mark Wielaard <mark at gcc dot gnu.org> ---
This still replicates with valgrind 3.18.1 and gcc 11.2.1:

$ gcc -O1 -std=3Dc11 -g PR63311.c -lm && valgrind --track-origins=3Dyes ./a=
.out
=3D=3D2836066=3D=3D Memcheck, a memory error detector
=3D=3D2836066=3D=3D Copyright (C) 2002-2017, and GNU GPL'd, by Julian Sewar=
d et al.
=3D=3D2836066=3D=3D Using Valgrind-3.18.1 and LibVEX; rerun with -h for cop=
yright info
=3D=3D2836066=3D=3D Command: ./a.out
=3D=3D2836066=3D=3D=20
=3D=3D2836066=3D=3D Conditional jump or move depends on uninitialised value=
(s)
=3D=3D2836066=3D=3D    at 0x4011E2: test (PR63311.c:41)
=3D=3D2836066=3D=3D    by 0x401223: main (PR63311.c:130)
=3D=3D2836066=3D=3D  Uninitialised value was created by a stack allocation
=3D=3D2836066=3D=3D    at 0x40112D: test (PR63311.c:11)
=3D=3D2836066=3D=3D=20
=3D=3D2836066=3D=3D=20
=3D=3D2836066=3D=3D HEAP SUMMARY:
=3D=3D2836066=3D=3D     in use at exit: 0 bytes in 0 blocks
=3D=3D2836066=3D=3D   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
=3D=3D2836066=3D=3D=20
=3D=3D2836066=3D=3D All heap blocks were freed -- no leaks are possible
=3D=3D2836066=3D=3D=20
=3D=3D2836066=3D=3D For lists of detected and suppressed errors, rerun with=
: -s
=3D=3D2836066=3D=3D ERROR SUMMARY: 4 errors from 1 contexts (suppressed: 0 =
from 0)=