On Thu, Feb 08, 2018 at 09:47:53AM +0000, David Laight wrote: > From: Peter Zijlstra
> > I went through the register opcodes and matched it against the ModR/M > > encoding, and the best option I've found so far is using 0xd6 as the > > next byte. > > Wouldn't 0xc3 work as well. > A retq is probably better than an extra (bad). I explicity did not use c3 because that generates spurious "retq" in the code flow which is mighty confusing when you read the stuff.
