[Issue 16560] [Mir] Prefetch intrinsics like in LDC

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16560

--- Comment #4 from Илья Ярошенко <ilyayaroshenko at gmail.com> ---
Copy-past from GitHub

Wow, that was fast!

Nitpicks:

LLVM parameter is missing. This is not used now, but likely be used in the
future. For example intel CPU has non shared L1 / L2 caches. If GDC BE has not
this feature, it can just ignore it.

Only __prefetch should be presented, and it would be nice to have it as a part
of the language instead of DRuntime hack. Making it a function breaks final
fastmath optimization for LDC. So, only real intrinsics should be provided for
user without any function shells. Underscored __names looks good to me. Also
this will help to BetterC mode.

A clean API without encodings is required for __prefetch in context of (2).

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