https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69311
--- Comment #3 from Matthias Klose <doko at gcc dot gnu.org> --- sorry, that should be -O3: s390x-linux-gnu-gcc -std=c99 -Wall -march=zEC12 -O3 -c tiny_psnr.i
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69311
--- Comment #3 from Matthias Klose <doko at gcc dot gnu.org> --- sorry, that should be -O3: s390x-linux-gnu-gcc -std=c99 -Wall -march=zEC12 -O3 -c tiny_psnr.i