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MTDiscord |
<luatic> sfan5: Have you considered the performance implications of https://github.com/minetest/irrlicht/commit/81bae5b717a79fc2b05a09f760afc7b44da98487 ? It looks like those "questionable" bit hacks were used to improve performance by getting rid of expensive branching. |
| 10:13 |
MTDiscord |
<Sublayer plank> improving performance by making it return wrong at times doesn't feel like a smart way of doing things |
| 10:15 |
sfan5 |
yes and the result I arrived at is "the compiler should optimize it somehow" |
| 10:16 |
sfan5 |
perhaps using a CMOV instructions or by applying a (this time correct) version of the bit hacks itself |
| 11:02 |
MTDiscord |
<luatic> Well, IIRC ternaries don't use branching, and simple if-return things might be optimized to ternaries. |
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pgimeno |
compilers know how to optimize return a < b ? a : b; and similar |
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pgimeno |
if the boolean operation is better, they will use that |
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pgimeno |
this proves that the compiler knows about it: https://godbolt.org/z/vo4Ma676x |
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pgimeno |
in x86-64, ARM etc. it uses conditional move (cmov / movlt) |
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