> Both gcc versions you quote are fairly old; if efficiency interests you, > you might try a current version. Were you able to show a significant > difference in performance on a CPU which is important to you? I have not checked that, my goal is to produce, if it is possible, the same assembly code. I would > guess the most important reason for avoiding use of eax here would be to > keep that register available for other use. The optimization could be > affected by compiler switches (-Os, -O2) or by selection of -march > option, and many other possibilities. If I try using optimisation flags or -march, i get a completely different code. > Newer CPUs have hardware merging of operations, as well as stalls on > certain immediate data operations, so it is impossible to know the > performance implications from what you have presented. What do you mean by "hardware merging of operations" ? Accédez au courrier électronique de La Poste : www.laposte.net 3615 LAPOSTENET (0,34 ?/mn)
