https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94135
--- Comment #2 from Jens Seifert <jens.seifert at de dot ibm.com> --- POWER8 Processor User’s Manual for the Single-Chip Module: addi addis add add. subf subf. addic subfic adde addme subfme addze. subfze neg neg. nego 1 - 2 cycles (GPR) 2 cycles (XER) 5 cycles (CR) 6/cycle, 2/cycle (with XER or CR updates) CA is part of XER. 1-2 cycles versus 2 cycles.