[Bug target/86828] [7 Regression] wrong-code bug with "-march=knl -Ofast" (invalid memory reference)

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86828

--- Comment #9 from janus at gcc dot gnu.org ---
(In reply to Richard Biener from comment #8)
> More details are needed here.

What exactly do you need?


$ gfortran-7 -march=knl -Ofast -g c0.f90
$ gdb ./a.out
[..]
(gdb) run
Starting program: /home/janus/fort/gfortran_bugs/86828_knl/a.out 

Program received signal SIGSEGV, Segmentation fault.
s (n=..., n=...) at c0.f90:26
26            liKOB = Y(n%list)
(gdb) bt
#0  s (n=..., n=...) at c0.f90:26
#1  0x0000555555554a9b in knl_bug () at c0.f90:17
#2  main (argc=argc@entry=1, argv=0x7fffffffe53a) at c0.f90:17
#3  0x00007ffff7626b97 in __libc_start_main (main=0x555555554800 <main>,
argc=1, argv=0x7fffffffe298, 
    init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
stack_end=0x7fffffffe288)
    at ../csu/libc-start.c:310
#4  0x0000555555554bca in _start ()