On Wed, Sep 28, 2016 at 11:51 AM, Tim Prince <n8tm@xxxxxxx> wrote: > Most CPU s are designed to favor forward conditional branches not taken, as > far as static prediction is concerned. This should correspond with the > priorities you quoted. If you wish to change the code generation to favor a > given training set (without sorting source code), you may try the profile > guided feature of your compiler. > In some cases where several branches are likely, putting the shortest cases > first may be helpful. Thanks Tim. I audited a class that provides a BigInteger in C++. It performed well before the profile driven changes. Reordering the statements to take advantage of the profiling data sped up public key operations. It was a small change, but it was measurable and repeatable. It also looks like newer processors benefit the most. Jeff
