[Sbcl-devel] Issue Fresh in SBCL 1.1.8: SSE Intrinsics!

[Lynn Q. <quam@AI.SRI.COM>]

When experimenting with the code in 
http://www.pvk.ca/Blog/2013/06/05/fresh-in-sbcl-1-dot-1-8-sse-intrinsics 
I experienced problems with "arithmetic error FLOATING-POINT-OVERFLOW 
signalled".    After studying the code for a while I determined that the 
code must be run with floating traps disabled, as shown below, and the 
return results are then correct.   Paul Khuong's blog article doesn't 
mention this.

(sb-int:with-float-traps-masked (:OVERFLOW :INVALID)
   (mandelbrot-escape (%make-simd-pack-single 1.0 -1.0 3.0 0.0)
              (replicate-float 0.0)
              256))
1 256 0 256