Jakub Jelinek wrote: > /* X86_TUNE_USE_INCDEC */ > ~(m_PENT4 | m_NOCONA | m_CORE2I7 | m_GENERIC | m_ATOM), > > So, if you say -mtune=bdver1 or -mtune=k8, it will generate incl, > if addl is better (e.g. on Atom incl is very bad compared to addl $1), > it will generate it.
Why is lock inc/dec worse than add/sub on Core2I7? The only difference I know of is the way the carry flag is handled. Best regards, Piotr Wyderski
