News for hackers. Stuff that matters.

A comment on Echo – Assembly program that prints the first positional argument to stdout. Parent comment

Re:Echo – Assembly program that prints the first positional ... by tptacek on Monday January 02, 2017 @06:07AM (#13300459)
They're still the x86-64 implementation for things like strlen on a bunch of platforms. They're not always the fastest, but have code size advantages.

http://agner.org/optimize/optimizing_assembly.pdf

[ Parent | on HN ]
Re:Echo – Assembly program that prints the first positional ... by Stratoscope on Monday January 02, 2017 @06:25AM (#13300531)
That's a really interesting document - I am going to spend some time studying it, thanks!

Good point about the code size. I imagine there are likely to be cases where that would let some algorithm run faster overall because it fits in the instruction cache, even if the string operation considered on its own is slower.

[ Parent | on HN ]