An excellent resource on bit manipulation techniques and low-level bitwise operations.

Resource

Check out Bit Twiddling Hacks by Sean Eron Anderson at Stanford’s graphics lab.

This comprehensive guide covers various bitwise operations and optimizations, including:

• Counting set bits
• Determining if integers have opposite signs
• Computing absolute values without branching
• Swapping values without temporary variables
• Finding minimum/maximum without branching
• And many more clever bit manipulation techniques

These techniques are particularly useful for performance-critical code and understanding low-level programming concepts.