Module tr 

Functions

complement

Parse a tr character set string into a Vec of expanded characters.

delete

delete_mmap

Delete from mmap’d byte slice. Uses SIMD memchr for single-character delete (common case). For multi-char delete, uses 8-byte unrolled scan with bitset lookup.

delete_squeeze

delete_squeeze_mmap

Delete + squeeze from mmap’d byte slice.

expand_set2

Expand SET2 to match SET1 length for translation. If SET2 has [c*] repeats, fill them. Otherwise repeat last char.

parse_set

Parse a SET string into expanded bytes.

squeeze

squeeze_mmap

Squeeze from mmap’d byte slice. Uses a two-pass approach: find runs of squeezable bytes with memchr, then copy non-squeezed content in bulk.

translate

translate_mmap

Translate bytes from an mmap’d byte slice — zero syscall reads. Uses SIMD AVX2 for range-delta patterns (e.g., a-z → A-Z). Chunked approach: 1MB buffer fits in L2 cache, avoids large allocations. Translation is memory-bandwidth-bound (not compute-bound), so parallel offers minimal gain but costs 100MB+ allocation + zero-init overhead.

translate_squeeze

translate_squeeze_mmap

Translate + squeeze from mmap’d byte slice. Single buffer: translate into buffer, then squeeze in-place (wp <= i always holds). Eliminates second buffer allocation and reduces memory traffic.