[Openmcl-devel] PPC Floating-Point Compiler for MCL/OpenMCL

Randall Beer beer at eecs.cwru.edu
Fri Feb 7 18:33:25 UTC 2003


I'm releasing version 0.1 of FPC-PPC, a floating-point compiler for MCL 
and OpenMCL.

The source code and documentation can be found in the Software section 
at
http://vorlon.cwru.edu/~beer

FPC-PPC compiles Lisp double-float expressions directly into PPC 
assembly language, producing code that is usually significantly faster 
and that allocates much less memory than the Lisp compiler.

For example, the following function takes about 370 ms to execute 
100,000 times (on a 1GHz PowerBook G4; not including GC time) and 
allocates 14.4MB of memory on MCL 5.0b:

(defun euclidean-distance-3 (x1 y1 z1 x2 y2 z2)
   (let ((dx (- x1 x2))
         (dy (- y1 y2))
         (dz (- z1 z2)))
     (sqrt (+ (* dx dx) (* dy dy) (* dz dz)))))

Using FPC-PPC, the following executes in just 33 ms and allocates *no* 
memory:

(define-double-function  %euclidean-distance-3 (x1 y1 z1 x2 y2 z2)
   (let ((dx (- x1 x2))
         (dy (- y1 y2))
         (dz (- z1 z2)))
     (sqrt (+ (* dx dx) (* dy dy) (* dz dz)))))

(setf x! (%copy-float 0.0))

(time
   (dotimes (i 100000)
     (%set-double! x! (euclidean-distance-3 1.0D0 2.0D0 3.0D0 4.0D0 
5.0D0 6.0D0))))

This is a PRELIMINARY release.  Comments and bug reports are welcome.

Randy Beer


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