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* [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used
@ 2022-04-26 12:08 364961 at mail dot ru
2022-04-26 12:12 ` [Bug c++/105393] " pinskia at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: 364961 at mail dot ru @ 2022-04-26 12:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
Bug ID: 105393
Summary: A simple for loop becomes an infinite when -O1/2/3
used
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: 364961 at mail dot ru
Target Milestone: ---
Created attachment 52884
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52884&action=edit
the preprocessed bug's source file
The main function calls a function with a for loop inside. The called function
is declared like boolean, but in fact doesn't return any result. In this case
the for
loop becomes infinite when any optimisation used. But if:
- disable an optimisation;
- return boolean result;
- declare the function as void.
The behaviour will become correct. It looks like the bug 49218, but a little
bit
different.
build row:
g++ -O2 -std=c++11 -c main.cpp main.o
the compiler output:
main.cpp: In function ‘bool initAllBuffers()’:
aleksandr@workHost:~/work/multaleksandr@workHost:~/work/multex/
main.cpp:47:1: warning: no return statement in function returning non-void
[-Wreturn-type]
aleksandr@workHost:~/work/mulaleksandr@workHost:~/work/multex/a
47 | }
g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.1-6'
--with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-10
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie
--with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-gcn/usr,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-mutex
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.1 20210110 (Debian 10.2.1-6)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/105393] A simple for loop becomes an infinite when -O1/2/3 used
2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
@ 2022-04-26 12:12 ` pinskia at gcc dot gnu.org
2022-04-26 12:17 ` 364961 at mail dot ru
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-04-26 12:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Falling through to the end of a non void function in c++ is undefined.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/105393] A simple for loop becomes an infinite when -O1/2/3 used
2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
2022-04-26 12:12 ` [Bug c++/105393] " pinskia at gcc dot gnu.org
@ 2022-04-26 12:17 ` 364961 at mail dot ru
2022-04-26 12:32 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: 364961 at mail dot ru @ 2022-04-26 12:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
Laryushin Aleksandr <364961 at mail dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |FIXED
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/105393] A simple for loop becomes an infinite when -O1/2/3 used
2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
2022-04-26 12:12 ` [Bug c++/105393] " pinskia at gcc dot gnu.org
2022-04-26 12:17 ` 364961 at mail dot ru
@ 2022-04-26 12:32 ` jakub at gcc dot gnu.org
2022-04-27 6:51 ` 364961 at mail dot ru
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-04-26 12:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |INVALID
CC| |jakub at gcc dot gnu.org
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/105393] A simple for loop becomes an infinite when -O1/2/3 used
2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
` (2 preceding siblings ...)
2022-04-26 12:32 ` jakub at gcc dot gnu.org
@ 2022-04-27 6:51 ` 364961 at mail dot ru
2022-04-27 6:54 ` jakub at gcc dot gnu.org
2022-04-27 7:08 ` 364961 at mail dot ru
5 siblings, 0 replies; 7+ messages in thread
From: 364961 at mail dot ru @ 2022-04-27 6:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
Laryushin Aleksandr <364961 at mail dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |FIXED
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/105393] A simple for loop becomes an infinite when -O1/2/3 used
2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
` (3 preceding siblings ...)
2022-04-27 6:51 ` 364961 at mail dot ru
@ 2022-04-27 6:54 ` jakub at gcc dot gnu.org
2022-04-27 7:08 ` 364961 at mail dot ru
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-04-27 6:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |INVALID
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Please don't change the RESOLVED INVALID status, that is the right thing, there
was nothing fixed on the GCC side because the testcase was invalid.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/105393] A simple for loop becomes an infinite when -O1/2/3 used
2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
` (4 preceding siblings ...)
2022-04-27 6:54 ` jakub at gcc dot gnu.org
@ 2022-04-27 7:08 ` 364961 at mail dot ru
5 siblings, 0 replies; 7+ messages in thread
From: 364961 at mail dot ru @ 2022-04-27 7:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
--- Comment #3 from Laryushin Aleksandr <364961 at mail dot ru> ---
Sorry, this is my first bug report.
>Среда, 27 апреля 2022, 9:54 +03:00 от jakub at gcc dot gnu.org <gcc-bugzilla@gcc.gnu.org>:
>
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105393
>
>Jakub Jelinek <jakub at gcc dot gnu.org> changed:
>
> What |Removed |Added
>----------------------------------------------------------------------------
> Resolution|FIXED |INVALID
>
>--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
>Please don't change the RESOLVED INVALID status, that is the right thing, there
>was nothing fixed on the GCC side because the testcase was invalid.
>
>--
>You are receiving this mail because:
>You reported the bug.
Best regards, Laryushin Aleksandr
^ permalink raw reply [flat|nested] 7+ messages in thread
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2022-04-26 12:08 [Bug c++/105393] New: A simple for loop becomes an infinite when -O1/2/3 used 364961 at mail dot ru
2022-04-26 12:12 ` [Bug c++/105393] " pinskia at gcc dot gnu.org
2022-04-26 12:17 ` 364961 at mail dot ru
2022-04-26 12:32 ` jakub at gcc dot gnu.org
2022-04-27 6:51 ` 364961 at mail dot ru
2022-04-27 6:54 ` jakub at gcc dot gnu.org
2022-04-27 7:08 ` 364961 at mail dot ru
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