Remove .sdf from gitignore
9565ms - Current Best

Just as it says - it's the current best.
11830ms - Oldest Recovered

The ancestor of the code.
with all "rerolled" loops, etc.
11533ms - Removed Useless actor for iteration.
9569ms - Loop Unrolling

Unrolled actor's for loops to eliminate temporary variable 'z'
9570ms - elimination of unrolled loop variable

removed variable 'i' and i++ statements.
NO PERFORMANCE GAIN! (Can be considered same as the previous result.)
9566ms - elimination of useless 'w' variables

removal of w variables which doesn't need to be accessed
with a form of array. (caused by loop unrolling)
Almost no performance gain (in this case only, I think.)
6941ms - const mark of StreamIt static variables

Marked constant variables 'const'
which were 'static' variables in StreamIt.
Doing this will substitute some numbers
in compile time.