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An example of function bechmarking in D for various ways of emplementing mixins
import std.stdio;
import std.conv : to;
import std.datetime.stopwatch: benchmark, Duration;
mixin template kroundup32(T) {
// string mstr = "String from template";
void kroundup32(ref T x){
// pragma(inline, true);
--x;
x|=x>>1;
x|=x>>2;
x|=x>>4;
x|=x>>8;
x|=x>>16;
++x;
// writeln("X:", x, " v1: ", v1);
}
}
void mxroundup32(T)(ref T x){
mixin ("--x;x|=x>>1;x|=x>>2;x|=x>>4;x|=x>>8;x|=x>>16;++x;");
}
// String mixin version by Ali Çehreli
// Discussion: http://forum.dlang.org/post/ocbl17$14vl$1@digitalmars.com
string roundUp(alias x)()
if (is (typeof(x) == uint)) {
import std.string : format;
return format(q{
--%1$s;
%1$s |= %1$s >> 1;
%1$s |= %1$s >> 2;
%1$s |= %1$s >> 4;
%1$s |= %1$s >> 8;
%1$s |= %1$s >> 16;
++%1$s;
}, x.stringof);
}
unittest{
int n1 = 31;
int n2 = 32;
writeln("Testing kroundup32");
mixin kroundup32!(int, 3);
kroundup32(n1);
assert(n1 == 32);
kroundup32(n2);
assert(n2 == 32);
int num = 31;
// int mstr = 1234;
writeln("Before: ", num); // 31
mixin kroundup32!(int);
kroundup32(num);
writeln("After: ", num); //32
// writeln("Mstr: ", mstr);
num = 31;
mxroundup32!int(num);
writeln("Num 31 ->", num);
assert(num == 32);
num = 33;
mxroundup32!int(num);
writeln("Num 33 ->", num);
assert(num == 64);
}
void testMixinTemplate(){
uint n1 = 31;
mixin kroundup32!(uint);
kroundup32(n1);
}
void testMixinFunction(){
uint n2 = 31;
mxroundup32!uint(n2);
}
void testStringMixin(){
uint n3 = 31;
roundUp!(n3);
}
int main(){
writeln("Bench marking...");
auto r = benchmark!(testMixinTemplate, testMixinFunction, testStringMixin)(10_000);
auto f0 = to!Duration(r[0]);
auto f1 = to!Duration(r[1]);
auto f2 = to!Duration(r[2]);
writeln("Mixin Teplate: ", f0, "\nMixin Function: ", f1, "\nMixin string: ", f2);
return 0;
}
@biocyberman

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commented Apr 9, 2017

Moving the import format statement outside did not help much:

Before: 31
After: 32
Num 31 ->32
Num 33 ->64
Bench marking...
Mixin Teplate: 71 μs and 1 hnsec
Mixin Function: 73 μs and 3 hnsecs
Mixin string: 27 ms, 285 μs, and 5 hnsecs

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