https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94613 --- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> --- -fno-ipa-sra is required to get the same results as in the first comment. The full command line then is: c1plus -O3 -march=z14 t.ii -quiet -o t.s -fno-ipa-sra