feat(c-api): complete the stable ZSTDLIB_API surface + btopt/btultra perf - #413

Merged

polaz merged 12 commits into

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feat/#127-abi-completion

Jun 14, 2026

Commits on Jun 13, 2026

feat(c-api): complete the stable ZSTDLIB_API symbol surface
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perf(encode): seed the lazy row probe with the rep candidate
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perf(encode): table-lookup the literal-length code in the cost model
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perf(encode): table-lookup the match-length code in the cost model
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perf(encode): hoist the BT pointer-pair base out of self in the tree walk
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perf(encode): fold the BT decode underflow branch into the window check
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perf(encode): read opt[cur] on demand in DP, drop held node copy
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perf(encode): prefetch BT hash bucket to hide cold-miss stall
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perf(encode): prefetch next position's BT hash bucket a full iteration ahead
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perf(encode): get_unchecked BT child-descent compare (helps L18/L22)
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perf(encode): donor-form BT-walk window check in the loop condition
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fix(encode): reject stale BT candidate underflow on rebased streams
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