perf: optimize decode_checked for extended characters#18
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- Make Entry::write() branchless by always copying 3 bytes - Add ASCII fast path in decode_slice to skip table lookup for ASCII bytes - Use const generic to unify decode_slice variants This fixes a regression in decode_checked/extended (was 25-30% slower than v0.2.0) while improving decode_checked/mostly_ascii by 10-24% over v0.2.0. Benchmarks vs v0.2.0: - decode_checked/extended: now equal (was 25-30% slower) - decode_checked/mostly_ascii: 10-24% faster - decode_checked/ascii: equal - decode_lossy/*: 1.7-2.3x faster (unchanged) - encode_*: 2x+ faster (unchanged)
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Summary
Entry::writebranchless by always copying 3 bytes, then advancing by actual lengthdecode_slice_innerusing const generic to skip table lookups for ASCII bytesdecode_slicevariants withconst ASCII_OPT: boolgeneric parameterBenchmark Results (vs master)
decode_checked/extended (primary target):
decode_checked/mostly_ascii:
Test plan