[Tinycc-devel] A double-to-float conversion bug

[Viktor M]

Hello everyone. So today I stumbled upon this bug when doing math
involving conversions between float and double. A minimal example:

---
#include <stdio.h>

struct V {
    int x, y, z;
};

struct V vec(void)
{
    return (struct V) { 0, 0, 1 };
}

void func(float f, struct V v)
{
    printf("%f %d %d %d\n", f, v.x, v.y, v.z);
}

int main(void)
{
    float f = 5;
    double d = f;
    func(d, vec());
    return 0;
}
---

The code should print this:
5.000000 0 0 1

but it prints garbage in the first value like this:
-85964.625000 0 0 1

I've tried Linux x86_64 and both mob branch and 0.9.27 release.
tcc -run also fails.

I hope there is an easy fix for this. Thanks.