Re: [PATCH] net/crc: reduce usage of static arrays in net_crc_sse.c

[Stephen Hemminger <stephen@networkplumber.org>]

On Sat, 11 Oct 2025 16:59:34 +0530
Shreesh Adiga <16567adigashreesh@gmail.com> wrote:

> Replace the clearing of lower 32 bits of XMM register with blend of
> zero register.
> Remove the clearing of upper 64 bits of tmp1 as it is redundant.
> tmp1 after clearing upper bits was being xor with tmp2 before the
> bits 96:65 from tmp2 were returned. The xor operation of bits 96:65
> remains unchanged due to tmp1 having bits 96:64 cleared to 0.
> After removing the xor operation, the clearing of upper 64 bits of tmp1
> becomes redundant and hence can be removed.
> 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.
> 

Applied to net-next