Inlining Code Test

[bearophile]

Nick Voronin:

> Looks like alignment of local variables is somewhat broken.

This is a very nice bug. If not already present then please add it to Bugzilla. If you don't want to add it, then I will add it myself. I have modified your code like this:

import core.stdc.stdio: printf;
void main() {
    int a;
    double d;
    printf("%u %u\n", (cast(size_t)&a) % 8, (cast(size_t)&d) % 8);
}

And this shows the performance difference:

import core.stdc.stdio: printf;
import std.date: getUTCtime, ticksPerSecond;
void main() {
    double d = 0.0;
    auto t0 = getUTCtime();
    for (size_t i = 0; i < 100_000_000; i++)
        d += 1;
    auto t1 = getUTCtime();
    printf("%lf\n", d);
    printf("%u\n", (cast(size_t)&d) % 8);
    printf("%lf\n", (cast(double)t1 - cast(double)t0) / ticksPerSecond);
}

Bye,
bearophile