https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68829
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
Polyhedron 11 test_fpu2 currently segfaults on Fedora 25 due to this problem:
[uros@localhost source]$ /ssd/uros/gcc-build/gcc/xgcc -B
/ssd/uros/gcc-build/gcc -S -Ofast -funroll-loops test_fpu2.f90
[uros@localhost source]$ gfortran test_fpu2.s
[uros@localhost source]$ ulimit -s unlimited
[uros@localhost source]$ ./a.out
Benchmark running, hopefully as only ACTIVE task
Test1: Gauss - 1000 ( 250x 250) inverts in 14.892 seconds Err=0.000000000000
Test2: Crout - 1000 ( 250x 250) inverts in 16.343 seconds Err=0.000000000000
Test3: Crout - 2 (2000x2000) inverts in 9.769 seconds Err=0.000000000000
Test4: Lapack - 2 (2000x2000) inverts in 7.548 seconds Err=0.000000000013
Total = 48.6 sec
[uros@localhost source]$ ulimit -s 8192
[uros@localhost source]$ ./a.out
Benchmark running, hopefully as only ACTIVE task
Test1: Gauss - 1000 ( 250x 250) inverts in 14.810 seconds Err=0.000000000000
Test2: Crout - 1000 ( 250x 250) inverts in 16.538 seconds Err=0.000000000000
Segmentation fault (core dumped)
Also on Suse polyhedron tester [1]:
6 Apr 2017 15:03:29 gfortran_lin - Compile test_fpu2
command=/gcc/spec/sb-vangelis-head-64/x86_64/install-201704052254/bin/gfortran
-march=native -Ofast -funroll-loops test_fpu2.f90 -static -o test_fpu2
6 Apr 2017 15:03:42 gfortran_lin - Execute test_fpu2
sh: line 1: 29627 Segmentation fault ./test_fpu2 >>gfortran_lin.run
test_fpu2 Run # 1 151.34920 151.34920 - Error=100.0000%
sh: line 1: 29633 Segmentation fault ./test_fpu2 >dummyfile
test_fpu2 Run # 2 150.31599 150.83260 - Error= 0.3425%
sh: line 1: 29639 Segmentation fault ./test_fpu2 >dummyfile
test_fpu2 Run # 3 150.74271 150.80263 - Error= 0.1988%
sh: line 1: 29645 Segmentation fault ./test_fpu2 >dummyfile
test_fpu2 Run # 4 150.90080 150.82718 - Error= 0.1415%
[1] https://gcc.opensuse.org/c++bench/pb11/pb11-performance-latest
