|
|
|
|
|
|
by Veedrac
3283 days ago
|
|
|
That's not to say these optimisations are no longer needed; you just need to be smarter about applying them. If you're multiplying by 2^n - 1, for example, keeping n around and writing a pair of shifts is not an optimisation a compiler will be able to make, and even when doing the power inline (x * ((1 << n) - 1)) most compilers aren't able to optimise it properly. https://godbolt.org/g/aHmMDL |
|
|