Indeed, most of the instructions for bit extracting appeared later for SSE
and AVX. I did find one instruction that works with general-purpose
registers, named BEXTR, but it only extracts contiguous bits and requires
BMI1.
Gareth aka. Kit
On Sat 23/02/19 10:27 , Jonas Maebe jo...@freepascal.o
On 23/02/2019 01:30, J. Gareth Moreton wrote:
Given that the reference is an offset from %rbp, the compiler will know
for sure that the variable is local, so there won't be any problems with
multi-threading that prevents a lot of temporary register storage for
safety reasons.
Unpacking record
