Going Faster by Duplicating Code

Re:Going Faster by Duplicating Code by andersa on Wednesday October 11, 2023 @05:29AM (#37842485)

> This function doesn't know the value being multiplied until it is called. The compiler (gcc, O2) emits a generic integer multiply instruction in its loop body.

Well, that's because they did it wrong. Tiny math function like this should be defined in the header file and force-inlined, problem solved. No need for that template monstrosity suggested at the end.

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Re:Going Faster by Duplicating Code by voidstarcpp on Wednesday October 11, 2023 @08:45AM (#37843715)

The "tiny math function" is used for expository purposes of the generic application, to fit a trivial example on one page. Obviously it's not how you would literally write a function that transforms elements in a vector.

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