On Aug 15, 2013, at 20:36, Konstantin Belousov <kostikbel_at_gmail.com> wrote: > On Thu, Aug 15, 2013 at 08:13:34PM +0200, Dimitry Andric wrote: >> Alternatively, we could attempt to figure out why gcc doesn't want to >> inline those 64 bit builtins on FreeBSD. It seems to have no problem >> doing so on the first Linux box I tried... > > Does the linux box defaults to pentium or higher for -march ? > 64 bit atomics cannot be implemented in usermode on i386 on > processors which do not have cmpxchg8b instruction. Ah yes, you are totally right, with -v it gives: COLLECT_GCC_OPTIONS='-O2' '-S' '-v' '-mtune=generic' '-march=i586' So we should really disable atomics for i486 and lower? Though I have understood that there also some pentiums without cmpxchg8b...Received on Thu Aug 15 2013 - 17:13:04 UTC
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