https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110842
Bug ID: 110842
Summary: [14 Regression] Openmp loops with KIND=16 DO loops
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
gfortran with a reasonably current trunk gives wrong
results for omp parallel:
$ cat dynamic.f90
program main
implicit none
integer(kind=16) :: i, anfang, ende, delta
anfang = 0
ende = 2**10
delta = 2**6
!$omp parallel do default(private) schedule(dynamic,1)
do i=anfang, ende, delta
!$omp critical
print *,i
!$omp end critical
end do
end program main
$ gfortran dynamic.f90
$ ./a.out
0
64
128
192
256
320
384
448
512
576
640
704
768
832
896
960
1024
Without openmp, no problem.
With openmp, some values are garbage:
$ gfortran -fopenmp dynamic.f90
$ ./a.out
2584020860371700504877596135129104
768
192
704
960
128
896
64
2584020860371700504877596135130128
384
448
576
640
320
512
256
832
$ gfortran -v
Es werden eingebaute Spezifikationen verwendet.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/home/ig25/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Ziel: x86_64-pc-linux-gnu
Konfiguriert mit: ../trunk/configure --prefix=/home/ig25
--enable-languages=c,c++,fortran --disable-multilib
Thread-Modell: posix
Unterstützte LTO-Kompressionsalgorithmen: zlib
gcc-Version 14.0.0 20230722 (experimental) [master r14-2725-g73cc6ce1294] (GCC)
System compiler works fine:
$ /usr/bin/gfortran -fopenmp dynamic.f90
$ ./a.out
0
64
832
256
320
960
576
192
896
640
128
384
704
768
512
448
1024
$ /usr/bin/gfortran -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gfortran
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/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
11.3.0-1ubuntu1~22.04.1' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--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 --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-11-aYxV0E/gcc-11-11.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-aYxV0E/gcc-11-11.3.0/debian/tmp-gcn/usr
--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 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04.1)
