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Jan 17, 2023

21 minute watch

rust · cpp · asm

I ported some Advent of Code solutions from C/C++ to Rust, and used the opportunity to compare performance. When I couldn't explain why they performed differently, I had no choice but to disassemble both and look at what the codegen was like!

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Next power of two

Feb 22, 2013

9 minute read

gamedev · programming · asm

While looking to write a pure ooc version of ftgl, I was reading the source of ftgl-gl3 and I stumbled upon this piece of code:

cpp

static inline GLuint NextPowerOf2(GLuint in)
{
     in -= 1;

     in |= in >> 16;
     in |= in >> 8;
     in |= in >> 4;
     in |= in >> 2;
     in |= in >> 1;

     return in + 1;
}