[S] Change in coreboot[main]: commonlib: Add generic word-at-a-time optimization to ipchksum()

[Julius Werner (Code Review)]

Attention is currently required from: Arthur Heymans.

Hello Arthur Heymans,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/80304?usp=email

to look at the new patch set (#2).

Change subject: commonlib: Add generic word-at-a-time optimization to ipchksum()
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commonlib: Add generic word-at-a-time optimization to ipchksum()

This patch adds a generic optimization to calculate a machine-word-sized
"wide sum" for the ipchksum() algorithm. This is often not as
efficient as handcrafted assembly (about half as fast on arm64 and
x86_32, about the same speed on x86_64), but likely still much better
than nothing on architectures that we don't have handcrafted assembly
for.

Change-Id: I8f0fe117e2788d1b6801b73824b97e1e31ecc694
Signed-off-by: Julius Werner 
---
M src/commonlib/bsd/ipchksum.c
1 file changed, 13 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/04/80304/2