In this report we present the design of a stencil compiler for the
Connection Machine system CM--5.  The stencil compiler will optimize the 
data motion between processing nodes, minimize the data motion within a 
node, and minimize the data motion between registers and local memory in a node.
The compiler will natively support two--dimensional stencils, but stencils in
three dimensions will be automatically decomposed.  Lower dimensional stencils
are treated as degenerate stencils.  The compiler will be integrated as part
of the CM Fortran programming system.

Much of the compiler code will be adapted from the CM--2/200 stencil
compiler, which is part of CMSSL (the Connection Machine Scientific
Software Library) Release 3.1 for the CM--2/200, and the compiler will be
available as part of the Connection Machine Scientific Software Library
(CMSSL) for the CM-5.

In this report, we discuss the implementation status of the
stencil compiler. In particular, we discuss optimization strategies and
status of code conversion from CM-2/200 to CM-5 architecture, and
report on the measured performance of prototype target code which the
compiler will generate.