Loops can be flattened completely with the chess_flatten_loop pragma. This can be useful for small loops that are
not optimally automated by the AI Engine compiler. The flattening done in the final
scheduling phase, such that the code generation, is still done based on the loop
construct.
For loop flattening, the loop count can be determined by the
compiler. In cases where the loop count cannot be determined by the tool
automatically, you can set the loop count using the
chess_loop_count pragma. For
example:for(int i=0;i<6;i++) chess_flatten_loop {...}
for(...) chess_loop_count(6) chess_flatten_loop {...}With chess_unroll_loop(N), the loop
body can be duplicated N-1 times, and the loop
count is divided by N. The loop can also be
completely unrolled by chess_unroll_loop(*). The
loop is unrolled and rewritten as a repeated sequence of similar independent
statements.