SBCL-2.2.5 is out
Latest commit of sb-simd is not working on sbcl older then 2.2.4.

Please note that sb-simd is planned to be integrated into sbcl-2.2.5 with one function used in the benchmark codes missing, therefore most codes using it will have to be also updated when the integration is done.

I did modify the spectral-norm CL codes but since you are not accepting my PR I don't know what to do.

I could describe what to change or just look at my PR and see what is needed to be changed and update the codes accordingly.