On Sun, Jun 28, 2026 at 07:09:37PM -0700, H. Peter Anvin wrote: > On 2026-06-26 13:05, Xiang Mei wrote: > > > > Thanks for your questions and attention. > > > > 1) `enter` can do big enough stack pivoting (where we can't find many > > `add/sub/adc/sbb rsp, ` doing so) > > Say what? > > Using add/sub/lea on %rsp is probably more common than enter, because enter is > considered kind of slow. > > gcc, I believe, will generate "leave" but not "enter" as a result. > > > > 2) `enter` is not rare since we can take part in the instruction. > > This sentence doesn't parse.
They mean that we can jump into the middle of an instruction, and it is not rare to see a 'c8' byte in the instruction stream.
