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What does this C code do [Duffs device]? - Stack Overflow 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 Its discovery is credited to Tom Duff in November of 1983, who at the time was working for Lucasfilm
gcc - Is Duffs device still useful? - Stack Overflow In the Duff's Device case, the target was a memory-mapped register, and the source was an arbitrary pointer Today, the memory-mapped register would likely have to be tagged as volatile and it's not clear whether the compiler could determine whether the source and destination pointers could ever alias
c - How does Duffs device work? - Stack Overflow What Duff's device does is implement this idea, in C, but (as you saw on the Wiki) with serial copies What you're seeing above, with the unwound example, is 10 comparisons compared to 100 in the original - this amounts to a minor, but possibly significant, optimisation
Does Duffs Device Speed up Java Code? - Stack Overflow A trick known as Duff's device can be used in C or C++ to unroll the loop, but this is not valid code in the Java programming language: Or, more bluntly (from the same section): Great C hack, Tom, but it's not valid here EDIT: To answer your more (too) general question, usually no You should generally rely on the JIT
Android ColorFilter - Porter-Duff Modes - Stack Overflow Note that Porter-Duff modes are only defined to work properly with premultiplied alpha That means that none of the R, G or B components can exceed the alpha value GitHub project for the Android project which shows off all the Porter-Duff modes
Revising the syntax of Duffs device - Is this legal C C++? Only last night I encountered the curious Duff's device for the first time I've been doing some reading on it, and I don't think it's that daunting to understand What I am curious about is the strange syntax (from Wikipedia):
c - Writing a macro for Duffs Device - Stack Overflow Duff's Device, though nifty in select coding, is not a useful general purpose C idiom You may find some kudos using it, but be prepared for negative push-back – chux
c++ - How can Duffs device code be compiled? - Stack Overflow A simple explanation of why Duff's Device compiles is that the syntax of the switch statement isn't particularly specific about the form that the switch statement block might need to take There are a few restrictions, and a couple of things permitted in the controlled statement that aren't permitted outside a switch (the case and default labels)