+ * new feature: minimal runtime/compiler intrastructure support for SSE
+ SIMD values, as SB-EXT:SIMD-PACK. Enabled on x86-64 via the build-time
+ feature :sb-simd-pack. This should enable intrinsics extensions as
+ libraries, without patching SBCL itself. Thanks to Alexander Gavrilov
+ for maintaining a branch for so long.