I'm delirious so here's your daily dose of fuck:

```fasm
; --- * --- * ---
; 64-bit byte-by-byte mash

macro clamp_u8 {
mov cl,$08;
mov rdx,rax;
rept 8 \{
rol rdx,cl;
xor al,dl;
\};
};

; --- * --- * ---
; give 8-bit random seed

macro prng_u8 {
rdtsc;
shl rdx,32;
or rax,rdx;
clamp_u8;
};

; --- * --- * ---
; roll dice

d20: prng_u8;

; x%20, according to gcc ;>
mov edi,eax;
mov eax,-51;
mul dil;
shr ax,12;
lea eax,[rax+rax*4];
lea edx,[0+rax*4];
mov eax,edi;
sub eax,edx;

; discard high and give
and rax,$FF;
ret;
```

I guess `d20` could be inlined too but I thought it'd be too much.

Is it faster than straight C? Probably not. But it's way lighter, so it loads faster. Below five hundred bytes mother fucker.

Now if you'll excuse me, I'll go sit in the darkness repeteadly typing roll 1d20 on the terminal. For reasons.