Bounds Check Elimination: What the Compiler Can Prove
Locate surviving bounds checks and preserve input behavior when changing the proof available to the compiler.
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What this chapter teaches
Bounds checks are negligible, and the compiler removes them all anyway — slice indexing is basically free.
the compiler removes a bounds check when control-flow and value analysis prove that the index is in range. Facts can propagate across basic blocks, but opaque calls and relationships the compiler cannot establish can prevent elimination. In tight loops, surviving checks can be measurable.
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