That’s only been my experience with software that depends on many different libraries. And it’s extra painful when you find out that it needs hyper specific versions of libraries that are older than the ones you have already installed. Rust is only painless because it just downloads all the right dependencies.

Some old software does use 8-Bit ASCII for special/locale specific characters. Also there is this Unicode hack where the last bit is used to determine if the byte is part of a multi-byte sequence.

Interesting feature, I had no idea. I just verified this with gcc and indeed the return register is always set to 0 before returning unless otherwise specified.

int main(void)
{
    int foo = 10;
}

push   %rbp
mov    %rsp,%rbp
movl   $0xa,-0x4(%rbp) # Move 10 to stack variable
mov    $0x0,%eax       # Return 0
pop    %rbp
ret

int main(void)
{
    int foo = 10;
    return foo;
}

push   %rbp
mov    %rsp,%rbp
movl   $0xa,-0x4(%rbp) # Move 10 to stack variable
mov    -0x4(%rbp),%eax # Return foo
pop    %rbp
ret

Unless your machine has error correcting memory. Then it will take literally forever.

Your CPU has big registers, so why not use them!

#include <x86intrin.h>
#include <stdio.h>

static int increment_one(int input)
{
    int __attribute__((aligned(32))) result[8]; 
    __m256i v = _mm256_set_epi32(0, 0, 0, 0, 0, 0, 1, input);
    v = (__m256i)_mm256_hadd_ps((__m256)v, (__m256)v);
    _mm256_store_si256((__m256i *)result, v);
    return *result;
}

int main(void)
{
    int input = 19;
    printf("Input: %d, Incremented output: %d\n", input, increment_one(input));
    return 0;
}

It doesn’t help that they keep deprecating and changing standard stuff every other version. It’s like they can’t make up their mind and everything may be subject to change. Updating to the most recent release can suddenly cause 10s or 100s of compiler warnings/errors and things may no longer behave the same. Then you look up the new documentation and realize that you have to refactor a large part of the codebase because the “new way” is for whatever reason vastly different.