https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102622
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Aldy Hernandez from comment #4) > (In reply to Andrew Pinski from comment #3) > > (In reply to Andrew Pinski from comment #2) > > > Here is a slightly more reduced testcase (without the reasonable values): > > > > Looks like the store to var_22 was fully removed, I think this is not a > > vectorizer bug really, but rather some issue with jump threading .... > > I'm getting an illegal instruction, so perhaps I don't have a machine with > the appropriate hardware. I even get the illegal instruction with > -fno-thread-jumps: > > (base) abulafia:~/bld/t/gcc$ ./xg++ -B./ a.c -O3 > -L/usr/lib/gcc/x86_64-redhat-linux/11/ -march=skylake-avx512 > (base) abulafia:~/bld/t/gcc$ ./a.out > Illegal instruction (core dumped) You can download Intel SDE to run it: https://software.intel.com/content/www/us/en/develop/articles/intel-software-development-emulator.html > Can you try with -fno-thread-jumps to make sure its really the threader at > play? I will give it a try.
