On Tue, Sep 20, 2022 at 12:58 PM Dave Thaler <dthaler@xxxxxxxxxxxxx> wrote: > > > + For ISA versions prior to 3, Clang v7.0 and later can enable > > > +``BPF_ALU`` support with > > > + ``-Xclang -target-feature -Xclang +alu32``. > > > > I also suspect the clang notes would be better off in a separate document > > from the main ISA. > > No one else raised concerns at LPC when I explicitly asked this, but I > have no strong opinion either way other than whatever we do for Linux > notes and for Clang notes, the answer should be the same. It feels to me it would be better to document the latest ISA instead of diverging into -mcpu=v1,v2,v3 differences. So the standard would include all insns as of writing of the doc including atomics. Older compilers and compilers with certain flags may generate a subset of full ISA, but that can be a footnote or 'clang notes'. No one needs to read a history of how instructions were added over the last 8 years. That bit is in git logs anyway.
