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Apply a bunch of optimizations #315

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Merged
dduan merged 14 commits into from
Feb 7, 2026
Merged

Apply a bunch of optimizations #315

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86b4871
Gate quote scanning by head byte
dduan Feb 6, 2026
fb266c7
Avoid staging terminal selector segment
dduan Feb 6, 2026
2ea9a10
Use lookup table in basic string scan
dduan Feb 6, 2026
8b1c33a
Cache matcher index counts
dduan Feb 6, 2026
fcd20ad
Sample long key hash
dduan Feb 6, 2026
14fbb25
Inline key-value token write
dduan Feb 6, 2026
8c6f0ca
Fast-path single-segment selectors
dduan Feb 6, 2026
0f8ddd3
Skip key materialization in bare array selectors
dduan Feb 6, 2026
6aad138
Tighten scanString hot path
dduan Feb 6, 2026
e46fc53
Speed up double-quoted token scan
dduan Feb 6, 2026
3064c0d
Add table key-hash bloom filter
dduan Feb 6, 2026
2200882
Trim impossible pointer-nil branches
dduan Feb 6, 2026
d60ac45
Hoist first selector path segment
dduan Feb 6, 2026
245d0c3
Fast-path two-segment selectors
dduan Feb 6, 2026
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9 changes: 9 additions & 0 deletions Sources/TOMLDecoder/Parsing/Constants.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,15 @@ enum CodeUnits {
return UnsafePointer(ptr)
}()

nonisolated(unsafe) static let isBasicStringBodyChar: UnsafePointer<Bool> = {
let ptr = UnsafeMutablePointer<Bool>.allocate(capacity: 256)
ptr.initialize(repeating: true, count: 256)
ptr[Int(CodeUnits.backslash)] = false
ptr[Int(CodeUnits.doubleQuote)] = false
ptr[Int(CodeUnits.lf)] = false
return UnsafePointer(ptr)
}()

static let null: UTF8.CodeUnit = 0x00
static let unitSeparator: UTF8.CodeUnit = 0x1F
static let delete: UTF8.CodeUnit = 0x7F
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