Since I'm more comfortable with E-Mail than IRC, I'd like
to raise this subject here.
Last year I've extended the work done in 2009 by Paul Khuong
to support SSE intrinsics in SBCL core, and implemented a
contrib module with the actual intrinsic function definitions.
The patches for the SBCL core can be found here:
I took the liberty of regrouping Paul's changes from the original
time-based order into three patches based on their intent.
Note that the very first three patches deal with typos and
omissions in the already existing SSE instruction definitions,
and thus can be considered separately from the rest as bug fixes.
The actual contrib code is located here:
It also supports ECL, and is included in the latest release.