Burst no alias hint

Unity Engine
1

The Burst documentation is a bit outdated. In my case specifically:

Aliasing Checks
Since aliasing is so key to the compilers ability to optimize for performance, we’ve added some experimental aliasing intrinsics:

  • Unity.Burst.Aliasing.ExpectAlias expects that the two pointers do alias, and generates a compiler error if not.
  • Unity.Burst.Aliasing.ExpectNoAlias expects that the two pointers do not alias, and generates a compiler error if not.

Unity.Burst.Aliasing doesn’t exist anymore. I need to instruct Burst to disable Alias checks, as I am sure there is no aliasing. How?

2

I guess it’s the NoAlias attribute that must be set on the parameters. I’ll do some tests.

3

Yeah you want the NoAlias attribute on the parameters.

The experimental Aliasing intrinsics are for ensuring that the compiler definitely knows that something does or does not alias - they will generate compiler errors if it doesn’t (its a way for us to try and give you, the user, more insight into what the compiler thinks).

I hope to have them non-experimental in the Burst 1.3.0 timeframe (so a little while away yet).