On Wed, Sep 24, 2025 at 8:28 PM Thomas Monjalon <thomas@monjalon.net> wrote:

> Hello,
>
> 16/07/2025 12:34, Shreesh Adiga:
> > Replace the clearing of lower 32 bits of XMM register with blend of
> > zero register.
> > Replace the clearing of upper 64 bits of XMM register with
> _mm_move_epi64.
> > Clang is able to optimize away the AND + memory operand with the
> > above sequence, however GCC is still emitting the code for AND with
> > memory operands which is being explicitly eliminated here.
> >
> > Additionally replace the 48 byte crc_xmm_shift_tab with the contents of
> > shf_table which is 32 bytes, achieving the same functionality.
> >
> > Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
>
> Sorry I'm not following.
> Please could you start with defining the goal of this patch?
> Is it a code simplification or a performance optimization?

It is intended to be a minor performance optimization.