Re: Reducing the cost of autodecoding

[Ilya Yaroshenko via Digitalmars-d]

On Wednesday, 12 October 2016 at 16:07:39 UTC, Ilya Yaroshenko 
wrote:
On Wednesday, 12 October 2016 at 13:53:03 UTC, Andrei 
Alexandrescu wrote:
So we've had a good run with making popFront smaller. In ASCII 
microbenchmarks with ldc, the speed is indistinguishable from 
s = s[1 .. $]. Smaller functions make sure that the impact on 
instruction cache in larger applications is not high.

Now it's time to look at the end-to-end cost of autodecoding. 
I wrote this simple microbenchmark:

=====
import std.range;

alias myPopFront = std.range.popFront;
alias myFront = std.range.front;

void main(string[] args) {
    import std.algorithm, std.array, std.stdio;
    char[] line = "0123456789".dup.repeat(50_000_000).join;

For fair test line should be feet into L1 cache. --Ilya

EDITL For fair test the line should be in the L1 cache. --Ilya