Jan 20, 2017 · Duff's device In computer science, Duff's device is an optimized implementation of a serial copy that uses a technique widely applied in assembly language for loop unwinding.

Duff's device deals with serial copying, rather than just any old problem, but is a classic example of how optimisations can be made by reducing the number of times that a comparison needs to be done in a …

Jan 12, 2012 · Duff's device is all about omitting most of the continuation checks, so it needs to be possible to predict how the continuation check behaves. Probably, as long as dim is a power of 2 or …

Jun 7, 2015 · I would like to know what PorterDuff.Mode means in android graphics. I know that it is a transfer mode. I also know, that it has attributes such as DST_IN, Multiply etc.

I have a timestamp column where the timestamp is in the following format 2016-06-16T21:35:17.098+01:00 I want to extract date and time from it. I have done the following: import …

May 14, 2018 · I want to know how to map values in a specific column in a dataframe. I have a dataframe which looks like:

Feb 9, 2019 · I am trying to create a new column in an dataframe, by creating a dictionary based on an existing column and calling the 'map' function on the column. It seemed to be working for quite some …

Implementations of Duff's Device in particular lend themselves well to the equivalent machine code or IL because each block of instructions will often be the same length without needing the addition of nop …

Sep 18, 2008 · This Duff's device implementation has a bug that makes it extremely slow: count is type int so the % must perform a real division/modulo operation. Make count unsigned (or better yet, …

Jul 28, 2010 · Consider also the classic use of do-while in Duff's device (wherein a while loop is transformed into an unrolled do-while with a larger step plus a jump table to handle the remainder) …