[S] Change in coreboot[main]: lib/lzmadecode: Allow for 8 byte reads on 64bit

[Arthur Heymans (Code Review)]

Attention is currently required from: Arthur Heymans, Julius Werner, Paul Menzel, Subrata Banik.

Hello Julius Werner, Subrata Banik, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/70175?usp=email

to look at the new patch set (#4).

The following approvals got outdated and were removed:
Code-Review+2 by Julius Werner, Code-Review+2 by Subrata Banik, Verified+1 by build bot (Jenkins)

Change subject: lib/lzmadecode: Allow for 8 byte reads on 64bit
......................................................................

lib/lzmadecode: Allow for 8 byte reads on 64bit

This adds an optimization to lzma decode to also read from the boot
medium in chunks of 8 bytes if that is the general purpose register
length instead of always 4 bytes. It depends on the cache / memory / spi
controller whether this is faster, but it's likely to be either the same
or faster.

TESTED
- google/vilboz: cached boot medium
64bit before - 32bit - 64bit after
load FSP-M: 35,674 - 35,595 - 34,690
load ramstage: 42,134 - 43,378 - 40,882
load FSP-S: 24,954 - 25,496 - 24,368

- foxconn/g41m: uncached boot medium for testing
64bit before - 32bit - 64bit after
load ramstage: 51,164 - 51,872 - 51,894

Change-Id: I890c075307c0aec877618d9902ea352ae42a3bfa
Signed-off-by: Arthur Heymans 
---
M src/lib/lzmadecode.c
M src/lib/lzmadecode.h
2 files changed, 10 insertions(+), 10 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/70175/4