Apply bitwise tricks for performance

Q: Apply bitwise tricks for performance

This question evaluates proficiency with bitwise operations, branchless programming, low-level performance optimizations, and microarchitectural reasoning about pipeline stalls, instruction-level parallelism, and cache behavior.

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Question

For an integer-heavy inner loop, propose bit-level optimizations that reduce branches and memory traffic: e.g., population count usage, fast modulo by power-of-two with masks, branchless conditional updates via bitwise selects, and alignment checks. Provide concise code examples, explain correctness, and analyze the microarchitectural impact (pipeline stalls, ILP, cache behavior).

Apply bitwise tricks for performance

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