https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87649
Bug ID: 87649
Summary: ICE in OpenMP doacross (ordered) loop
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: omrimor2 at illinois dot edu
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Created attachment 44855
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44855&action=edit
Minimal Working Example (C)
An OpenMP loop construct with an ordered clause with a parameter and a nested
ordered construct with no depend clause causes an internal compiler error
during the 'ompexp' GIMPLE pass. This is invalid OpenMP*, but should not cause
an ICE segfault. Clang returns with an error, while ICC compiles (!) the
invalid code but imposes no ordering constraint. Occurs on both macOS
(Homebrew, GCC 8.2.0) and a Linux cluster (GCC 7.2.0).
I haven't confirmed if this is C/C++ frontend-specific or errors with Fortran
as well.
*The loop or loop SIMD region to which an ordered region arising from an
ordered construct without a depend clause binds must have an ordered clause
without the parameter specified on the corresponding loop or loop SIMD
directive. (OpenMP 4.5 Specification, ยง2.13.8, pp. 168)
#pragma omp parallel for ordered(1)
for (int i = 0; i < 100; i++) {
#pragma omp ordered
array[i] = i;
}
macOS:
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/8.2.0/libexec/gcc/x86_64-apple-darwin18.0.0/8.2.0/lto-wrapper
Target: x86_64-apple-darwin18.0.0
Configured with: ../configure --build=x86_64-apple-darwin18.0.0
--prefix=/usr/local/Cellar/gcc/8.2.0
--libdir=/usr/local/Cellar/gcc/8.2.0/lib/gcc/8
--enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-8
--with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr
--with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl
--with-system-zlib --enable-checking=release --with-pkgversion='Homebrew GCC
8.2.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--disable-nls --disable-multilib --with-native-system-header-dir=/usr/include
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
Thread model: posix
gcc version 8.2.0 (Homebrew GCC 8.2.0)
Linux:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc/7.2.0/libexec/gcc/x86_64-pc-linux-gnu/7.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-7.2.0/configure --with-gmp=/usr/local/gmp/6.1.0
--with-mpfr=/usr/local/mpfr/3.1.4 --with-mpc=/usr/local/mpc/1.0.3
--with-cloog=/usr/local/cloog/ --with-isl=/usr/local/isl/0.16.1
--enable-cloog-backend=isl --prefix=/usr/local/gcc/7.2.0
Thread model: posix
gcc version 7.2.0 (GCC)
Command line:
gcc -o test1 -fopenmp test1.c
Compiler output:
test1.c: In function 'main':
test1.c:7:10: internal compiler error: Segmentation fault: 11
#pragma omp parallel for ordered(1)
^~~
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://github.com/Homebrew/homebrew-core/issues> for instructions.
