a939670129 / bit-twiddling-hacks-collection Goto Github PK

A single C header files containing functions with different bit twiddling hacks and a short explanation. I've put them together for myself as a cheatsheet and to play around with them. If you know any hacks not included, just submit a PR, or if you encounter any wrong stuff or a typo!

Short hack assortment:

• Number multiplication, division
• Even, odd and power checks
• Uppercase, lowercase
• Set, clear and flip bits
• Insert and extract bitfields into words
• Convert LSL, MSB, trailing bits
• Masked copy
• Bit swap
• Population count
• Bit island count
• Bit scans
• Lexiocographic permutations
• Swapping without temporaries
• Size comparison: min() and max() functions without branching
• Modular additions
• Power rounding
• Significant masking
• Logbase2 of power2 calculation using deBruijin sequence
• Fast inverse sqrt
• Bit reversion
• Masked color operations
• XOR en/decryption
• Branchless assignments