[Bug middle-end/63311] [9/10/11/12 Regression] -O1 optimization introduces valgrind warning

["mark at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63311

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

           What    |Removed                     |Added
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                 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=c11 -g PR63311.c -lm && valgrind --track-origins=yes ./a.out
==2836066== Memcheck, a memory error detector
==2836066== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==2836066== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==2836066== Command: ./a.out
==2836066== 
==2836066== Conditional jump or move depends on uninitialised value(s)
==2836066==    at 0x4011E2: test (PR63311.c:41)
==2836066==    by 0x401223: main (PR63311.c:130)
==2836066==  Uninitialised value was created by a stack allocation
==2836066==    at 0x40112D: test (PR63311.c:11)
==2836066== 
==2836066== 
==2836066== HEAP SUMMARY:
==2836066==     in use at exit: 0 bytes in 0 blocks
==2836066==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==2836066== 
==2836066== All heap blocks were freed -- no leaks are possible
==2836066== 
==2836066== For lists of detected and suppressed errors, rerun with: -s
==2836066== ERROR SUMMARY: 4 errors from 1 contexts (suppressed: 0 from 0)