Common Patterns for Bounds Check Elimination
summary
Shows concrete patterns that let the Go compiler drop bounds checks and measurably speed code: use dummy access to move checks outside loops, reslice to fixed length when an index contains a variable, and move check outside loop for sequential indices; exploit known ranges (byte = 0–255). Demonstrates on a Levenshtein implementation, cutting bounds checks from seven to one and getting 17–27% faster (≈22% average). Uses the compiler’s diagnostics that print “found is inbounds” to verify each change and stresses benchmarking and readability tradeoffs.
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