Bitwise rotate of integral

[Johan Engelen]

On Monday, 7 January 2019 at 14:39:07 UTC, Per Nordlöw wrote:
> What's the preferred way of doing bitwise rotate of an integral 
> value in D?
>
> Are there intrinsics for bitwise rotation available in LDC?

LDC does not expose this intrinsic currently, but you can use 
LLVM's fshl:
https://llvm.org/docs/LangRef.html#llvm-fshl-intrinsic
It's a fairly new intrinsic, so won't work with older LLVM 
versions.

https://d.godbolt.org/z/SBnJFJ

As noted by others, the optimizer is strong enough to recognize 
what you are doing (without intrinsic) and use ror/rol if it 
deems it advantageous to do so.

-Johan