On Fri, Feb 01, 2019 at 06:46:53PM -0800, H.J. Lu wrote: > On Fri, Feb 1, 2019 at 4:50 PM Andi Kleen <a...@linux.intel.com> wrote: > > > > "H.J. Lu" <hjl.to...@gmail.com> writes: > > > > > To support it, we disable > > > MMX by default in 64-bit mode so that MMX registers won't be available > > > > Wouldn't that break inline assembler that references MMX register clobbers? > > Yes. You need to use -mmmx explicitly to enable MMX.
Such a breaking change needs to be clearly spelled out in the documentation / NEWS. -Andi
