Rust's integer intrinsics are impressive

Re:Rust's integer intrinsics are impressive by Animats on Saturday June 10, 2017 @02:57AM (#14526429)

Now that most CPUs have population count, it may as well be exposed at the language level.

Doing it by table lookup results in questions such as "am I wasting too much cache space on this?" and "is a 64K table causing cache misses".

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Re:Rust's integer intrinsics are impressive by tjalfi on Saturday June 10, 2017 @11:59AM (#14527795)

Fortran 2008 added a number of bit twiddling intrinsics[0].

Here are a few of the scalar intrinsics for bit counting.

  popcnt() - population count
  leadz() - leading zero
  trailz() - trailing zero
  poppar() - parity

[0] ftp://ftp.nag.co.uk/sc22wg5/n1701-n1750/n1729.pdf

Edited to fix formatting.

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Re:Rust's integer intrinsics are impressive by mpweiher on Saturday June 10, 2017 @03:01AM (#14526439)

> be exposed at the library level.

TFTFY :-)

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