[Bug c/116723] New: performance differs in -ffinite-loop with only type changing
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116723
Bug ID: 116723
Summary: performance differs in -ffinite-loop with only type
changing
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
13.2.0-23ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-13
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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 --enable-cet
--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-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.0 (Ubuntu 13.2.0-23ubuntu4)
$ gcc -O3 -ffinite-loops case1.c - o out1.o && ./out1.o
1
$ gcc -O3 -ffinite-loops case1.c - o out2.o && ./out2.o
(no results, a infinite loop)
case1.c:
#include "stdio.h"
#include "stdint.h"
union U0 {
int16_t f0;
int32_t f1;
} g;
int func_1(union U0 p)
{
p.f1 = 0;
for (p.f0 = 1; (p.f0 != (-18)); p.f0 = (int16_t)(3 - p.f0));
return 1;
}
int main () {
printf("%d", func_1(g));
return 0;
}
case2.c:
#include "stdio.h"
#include "stdint.h"
union U0 {
uint16_t f0;
int32_t f1;
}g;
int func_1(union U0 p)
{
p.f1 = 0;
for (p.f0 = 1; (p.f0 != (-18)); p.f0 = (uint16_t)(3 - p.f0));
return 1;
}
int main () {
printf("%d", func_1(g));
return 0;
}
The change between these two files is line 5 and line 12, from int16_t to
uint16_t.
With -O3 and -ffinite-loops optimization, case1.c outputs result "1", while
case2.c is considered as an infinite loop.
[Bug middle-end/116723] performance differs in -ffinite-loop with only type changing
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116723
--- Comment #2 from Ye Xiong ---
(In reply to Andrew Pinski from comment #1)
> (p.f0 != (-18))
>
> For uint16_t, this is always true and is an always infinite loop. While for
> int16_t it is not and the loop is removed because you supplied -ffinite-loop.
>
> -ffinite-loop does NOT remove always infinite loops by design and is what is
> required by the C++ standard even.
>
> So invalid by design.
However, if swap the two types in the union (in case1.c) like:
case3.c
union U0 {
int32_t f0;
int16_t f1;
} g;
int func_1(union U0 p)
{
p.f1 = 0;
for (p.f0 = 1; (p.f0 != (-18)); p.f0 = (int32_t) (3 - p.f0));
return 1;
}
Although p.f0 is a signed int, it will outputs "1" (with -O3 and
-ffinite-loops).
Even weirder, only change the type of p1 from int16_t to int32_t the basis of
case3.c:
case4.c
union U0 {
int32_t f0;
int32_t f1;
} g;
int func_1(union U0 p)
{
p.f1 = 0;
for (p.f0 = 1; (p.f0 != (-18)); p.f0 = (int32_t) (3 - p.f0));
return 1;
}
It will be seen as an infinite loop again.
[Bug middle-end/117143] New: program crash under -O3 optimization or higher with function optimization flags assigned
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117143
Bug ID: 117143
Summary: program crash under -O3 optimization or higher with
function optimization flags assigned
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
13.2.0-23ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-13
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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 --enable-cet
--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-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.0 (Ubuntu 13.2.0-23ubuntu4)
$ cat a.c
__attribute__((optimize("-ftree-pre")))
static void f(int)
{
unsigned l;
j:
for (l = 0; l <= 2; l++)
{
int x[] = {0};
if (l)
goto j;
}
}
int main() {
f(0);
}
$ gcc a.c -o case -O3 && ./case
Segmentation fault (core dumped)
$ gcc a.c -o case && ./case
(infinite loop, the program won't stop)
This bug can be reproduced on gcc 12, 13 (15 not tested).
Any further modification would eliminate bug.
The program is a designed inifinite loop. It would crash under -O3(or higher)
optimization. -O0, -O1, -O2 won't cause segmentation fault.
The __attribute__ in function f() cannot be moved, and can be substituted by
some of the optimization flags but cannot be substituted by optimization level
such as O1, O2, O3, etc.
[Bug middle-end/117243] New: program crash under -O3 optimization or higher
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117243
Bug ID: 117243
Summary: program crash under -O3 optimization or higher
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc-14
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
14-20240412-0ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr
--with-gcc-major-version-only --program-suffix=-14
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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 --enable-cet
--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-14-OQFzmN/gcc-14-14-20240412/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-14-OQFzmN/gcc-14-14-20240412/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver
--enable-checking=yes,extra,rtl --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240412 (experimental) [master r14-9935-g67e1433a94f]
(Ubuntu 14-20240412-0ubuntu1)
$ cat a.c
void foo(int a, int b) {
int i, j;
j:
for (b=0; b<2; b++)
{
int c[1][1];
int i, j;
for (i = 0; i < 1; i++)
for (j = 0; j < 1; j++)
c[i][j] = 1;
if (b)
goto j;
}
}
int main() {
foo(1, 2);
}
$ gcc a.c -O3 && ./a.out
Segmentation fault (core dumped)
$ gcc a.c && ./a.out
(infinite loop, the program won't stop)
This bug can be reproduced on gcc 14 and trunk.
Any further modification would eliminate bug.
The program is a designed inifinite loop. It would crash under -O3(or higher)
optimization. -O0, -O1, -O2 won't cause segmentation fault.
Interestingly, if param b in func foo is unsigned, the bug can be reproduced on
gcc 13(12 or lower cannot reproduce it)
[Bug middle-end/117243] program crash under -O3 optimization or higher
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117243 --- Comment #6 from Ye Xiong --- (In reply to Sam James from comment #1) > Trunk works. When param b is unsigned, trunk will crash.
[Bug middle-end/117243] program crash under -O3 optimization or higher
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117243 --- Comment #5 from Ye Xiong --- (In reply to Sam James from comment #1) > Trunk works.
[Bug middle-end/117243] program crash under -O3 optimization or higher
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117243
--- Comment #7 from Ye Xiong ---
(In reply to Ye Xiong from comment #6)
> (In reply to Sam James from comment #1)
> > Trunk works.
>
> When param b is unsigned, trunk will crash.
The original reduced file is:
#include
void foo(uint32_t a, uint8_t b)
{
int i, j;
lbl:
for (b = 0; (b <= 7); b += 1)
{
uint8_t c[1][1];
int i, j, k;
for (i = 0; i < 1; i++)
{
for (j = 0; j < 1; j++)
{
c[i][j] = 1;
}
}
if (b)
goto lbl;
}
}
int main() {
foo(1, 2);
}
this version will crash on -O3 or higher on trunk version, we reduced a bit
more but seems the bug would eliminate on trunk version.
[Bug middle-end/116749] New: program crash under -O3 optimization
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116749
Bug ID: 116749
Summary: program crash under -O3 optimization
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
13.2.0-23ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-13
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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 --enable-cet
--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-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.0 (Ubuntu 13.2.0-23ubuntu4)
$ cat case.c
int main ()
{
int g=0;
int l1[1];
int *l2 = &g;
int i;
for (i=0; i<1; i++)
l1[i] = (1);
for (g=0; g; ++g)
{
int *l3[1] = {&l1[0]};
}
*l2 = *l1;
b:
for (i=0; i<2; ++i)
{
if (i)
goto b;
if (g)
continue;
}
return 0;
}
$ gcc case.c -o case -O3 && ./case
Segmentation fault (core dumped)
$ gcc case.c -o case && ./case
(infinite loop, the program won't stop)
This bug can be reproduced on gcc 12 or higher.
Any further modification would eliminate bug.
The program is a designed inifinite loop. It would crash under -O3(or higher)
optimization. -O0, -O1, -O2 won't cause segmentation fault
[Bug middle-end/116906] New: floating point exception under -O2 optimization
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116906
Bug ID: 116906
Summary: floating point exception under -O2 optimization
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc-14
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
14-20240412-0ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr
--with-gcc-major-version-only --program-suffix=-14
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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 --enable-cet
--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-14-OQFzmN/gcc-14-14-20240412/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-14-OQFzmN/gcc-14-14-20240412/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver
--enable-checking=yes,extra,rtl --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240412 (experimental) [master r14-9935-g67e1433a94f]
(Ubuntu 14-20240412-0ubuntu1)
$ cat case.c
#include
int a = 1, b = 0;
uint64_t safe_mod(uint64_t a, uint64_t b)
{
if (b == 0) return a;
else return a % b;
}
int f(uint64_t p) {
int c = 0;
j:
b = safe_mod(
(c = ((a &= (0 < p)) && 1), 1), p);
if (!c)
goto j;
return 0;
}
int main() {
f(b);
}
$ gcc case.c -o case -O2 && ./case
Floating point exception (core dumped)
$ gcc case.c -o case -O3 && ./case
(infinite loop, the program won't stop)
This bug can be reproduced on gcc 11 or higher(gcc 15 not tested).
Any further modification would eliminate bug.
The program is a designed infinite loop. It would crash only under -O2
optimization. Other optimization levels won't cause crash.
btw, could you tell me where is gcc 15 available? Thanks a lot.
[Bug middle-end/118258] New: dead code causes missed optimization at -O2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118258
Bug ID: 118258
Summary: dead code causes missed optimization at -O2
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc-14
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
14-20240412-0ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr
--with-gcc-major-version-only --program-suffix=-14
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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 --enable-cet
--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-14-OQFzmN/gcc-14-14-20240412/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-14-OQFzmN/gcc-14-14-20240412/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver
--enable-checking=yes,extra,rtl --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240412 (experimental) [master r14-9935-g67e1433a94f]
(Ubuntu 14-20240412-0ubuntu1)
$ cat case.c
#include
int g1, g2 = 0L;
volatile int8_t g3;
volatile int8_t *g4 = &g3;
uint8_t g5;
int8_t g6;
int main() {
if (g2) {
int8_t *l = &g3;
for (g5 = 0; g5 <= 1; g5 += 1) {
*l ^= 1;
g4 = (l = &g6, (void *)0);
for (g6 = 1; (g6 >= 0); g6 -= 1)
g1 = 0;
}
} else {
for (int i = 0; i > -23; i = (uint16_t)(i - 1)) {
g3 = (g1 == 0 ? 0 : 1 % g1);
}
}
return 0;
}
$ gcc case.c -o case -O2 && ./case
Floating point exception (core dumped)
$ gcc case.c -o case -O0 && ./case
(infinite loop, the program won't stop)
This bug can be reproduced from gcc 9 or higher(but works on trunk).
Any further modification would eliminate bug.
The program is a designed infinite loop. It would crash under -O2 optimization
for gcc 9-14, -O3(and -Ofast) for gcc 9-11.
[Bug c++/119999] New: Wrong Pointer Comparison in GCC 10/11/12/13 with -Os/-Oz Flags
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11
Bug ID: 11
Summary: Wrong Pointer Comparison in GCC 10/11/12/13 with
-Os/-Oz Flags
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bouncy12578 at gmail dot com
Target Milestone: ---
***
gcc version:
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc-13
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
13.1.0-8ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs
--enable-languages=c,ada
,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr
--with-gcc-major-version-only --program-suffix=-13
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-l
inker-build-id --libexecdir=/usr/libexec --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap
--enable-clocale=gnu --e
nable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-defaul
t-pie --with-system-zlib --enable-libphobos-checking=release
--with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch
--disable-werror --enable-cet --
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-13-IvzKaI/gcc
-13-13.1.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-IvzKaI/gcc-13-13.1.0/debian/tmp-gcn/usr
--enable-offload-defaulted --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-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.1.0 (Ubuntu 13.1.0-8ubuntu1~22.04)
***
Program:
$ cat a.cpp
#include
int a = 0;
static int b = 1;
void f(int * p){
l:
assert (p == &a);
if (b)
goto l;
}
int * g(){
return &a;
}
int main(int argc, char* argv[]){
f(g());
return 0;
}
***
Command Lines:
$ gcc a.cpp -o a.out -Os && ./a.out
a.out: a.cpp:7: void f(int*): Assertion `p == &a' failed.
Aborted
fail in gcc 10/11/12/13 with -Os/-Oz
