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Merged
kolkov merged 6 commits into from
Feb 4, 2026
Merged

release: v0.2.0 #2

kolkov merged 6 commits into from
Feb 4, 2026

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@kolkov
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@kolkov kolkov commented Feb 4, 2026

Summary

Release v0.2.0 — major performance and emoji handling improvements.

Performance

  • SWAR optimization: isASCIIOnly() and asciiWidth() process 8 bytes/iter using uint64 word tricks
  • Short string optimization: strings < 8 bytes use fused ASCII check + width count
  • O(1) 3-stage table: replaced binary search fallback with hierarchical table (3.8KB, ROOT→MIDDLE→LEAVES)

Features

  • ZWJ emoji sequences: forward-scan state machine (default→emoji→emojiZWJ), family/couple/profession sequences render as width 2
  • Emoji skin tone modifiers: U+1F3FB-1F3FF handled correctly in emoji context
  • isExtendedPictographic() / isEmojiModifier() helpers

CI/CD

  • New benchmarks.yml: regression detection (benchstat) + three-way library comparison table in PR comments
  • Updated all GitHub Actions to latest versions (checkout v6, setup-go v6, codecov v5, golangci-lint v9)
  • Anti-duplication triggers with concurrency groups
  • Removed develop/release/hotfix branch triggers (main + PRs only)

Documentation

  • Updated README.md, CHANGELOG.md, ARCHITECTURE.md for v0.2.0
  • Added public ROADMAP.md (Now/Next/Later format)
  • Removed dead code: tables.go (186 lines, unused since tables_generated.go)

Benchmarks (i7-1255U)

Scenario v0.1.0 v0.2.0 Speedup
ASCII short (5 chars) ~50ns ~7ns 7x
ASCII medium (44 chars) ~300ns ~20ns 15x
CJK (6 chars) ~60ns ~40ns 1.5x
ZWJ family — ~95ns new

Test plan

  • go test -v — all tests pass
  • go test -race (via WSL2) — no races
  • golangci-lint run — 0 issues
  • gofmt -l . — all formatted
  • scripts/pre-release-check.sh — green (1 warning: planned TODO)
  • CI passes on GitHub

kolkov added 6 commits February 5, 2026 00:14
@kolkov
bench: add three-way comparison with rivo/uniseg
326c301 
- Add rivo/uniseg as third comparison library alongside go-runewidth
- Add Uniseg variants for all StringWidth benchmarks (15 new benchmarks)
- Add Complex Unicode section: flags, ZWJ sequences, combined strings (9 benchmarks)
- Update README.md with results tables and library comparison
- Total: 51 benchmarks (was 30)
- Addresses #1
@kolkov
perf: SWAR optimization for ASCII fast paths
4c7f02b 
- Replace byte-by-byte isASCIIOnly() with SWAR processing 8 bytes/iter
- Add asciiWidth() with Daniel Lemire's SWAR control char detection
- Add short string fast path (<8 bytes) to avoid SWAR call overhead
- ASCII Short: 9 ns → 6 ns (1.5x faster)
- ASCII Medium: 71 ns → 24 ns (3x faster)
- ASCII Long: 340 ns → 77 ns (4.4x faster)
- Now 46x faster than go-runewidth, 77x faster than uniseg on long ASCII
- Zero allocations maintained for all ASCII paths
@kolkov
perf: replace binary search with O(1) multi-stage lookup table
1ca4923 
- 3-stage hierarchical table: ROOT(256B) → MIDDLE(17×64) → LEAVES(78×32)
- Total size: 3.8KB with bucket deduplication
- 2-bit width encoding: 0=zero-width, 1=narrow, 2=wide, 3=ambiguous
- Exhaustive verification: all 1,112,064 valid codepoints match
- Coverage improved: 87.1% → 97.6%
- Merged zero-width format chars (0x200B-0x200F) into single range
- Updated generator with buildWidthMap() and buildMultiStageTable()
- Fixed 3 conformance test expectations for Unicode 16.0 data
@kolkov
feat: ZWJ emoji sequence and skin tone modifier support
06aa51e 
- Forward-scan state machine for correct ZWJ width calculation
- Family emoji (👨‍👩‍👧‍👦) now correctly returns width 2, not 8
- Emoji modifier sequences (👍🏽) return width 2, not 4
- Handles profession ZWJ (👩‍🔬), flags (🏳️‍🌈), hearts (❤️‍🔥)
- Zero overhead for ASCII strings (fast paths unchanged)
- Zero allocations for short emoji sequences (stack-allocated)
- Added isExtendedPictographic() and isEmojiModifier() helpers
- 48 new test cases: ZWJ sequences, modifiers, edge cases
- 4 new benchmarks: ZWJ family, couple, modifier, mixed
- Coverage: 96.4%, lint: 0 issues
@kolkov
docs: update public documentation for v0.2.0 release
e576f96 
- CHANGELOG.md: add v0.2.0 section (ZWJ, SWAR, 3-stage table)
- README.md: update features, architecture, benchmarks, coverage
- ARCHITECTURE.md: add ZWJ state machine, SWAR, 3-stage table sections
- ROADMAP.md: add public roadmap (Now/Next/Later format)
- tables.go: remove dead code (replaced by tables_generated.go)
@kolkov
chore: update CI workflows and fix code formatting
2f20abd 
- Update GitHub Actions: checkout v6, setup-go v6, codecov v5, golangci-lint v9
- Add benchmarks.yml: regression detection (benchstat) + library comparison table
- Remove develop/release/hotfix branch triggers (main-only + PRs)
- Add concurrency groups to prevent duplicate CI runs
- Fix gofmt formatting in source files
@github-actions
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github-actions bot commented Feb 4, 2026

Library Comparison

Scenario uniwidth go-runewidth uniseg vs runewidth vs uniseg Winner
RuneWidth ASCII 2.179 ns 2.494 ns — ns 1.1x — uniwidth
RuneWidth CJK 2.801 ns 21.65 ns — ns 7.7x — uniwidth
RuneWidth Emoji 2.490 ns 13.63 ns — ns 5.4x — uniwidth
StringWidth ASCII Long 67.22 ns 3388 ns 5122 ns 50.4x 76.1x uniwidth
StringWidth ASCII Medium 16.17 ns 636.3 ns 957.3 ns 39.3x 59.2x uniwidth
StringWidth ASCII Short 5.643 ns 74.20 ns 113.3 ns 13.1x 20.0x uniwidth
StringWidth CJK Medium 743.3 ns 1546 ns 2009 ns 2.0x 2.7x uniwidth
StringWidth CJK Short 74.73 ns 157.6 ns 210.6 ns 2.1x 2.8x uniwidth
StringWidth Combined 289.9 ns 404.9 ns 707.0 ns 1.3x 2.4x uniwidth
StringWidth Emoji Medium 660.0 ns 1010 ns 1433 ns 1.5x 2.1x uniwidth
StringWidth Emoji Short 162.5 ns 266.3 ns 399.9 ns 1.6x 2.4x uniwidth
StringWidth Flags 111.8 ns 234.1 ns 310.7 ns 2.0x 2.7x uniwidth
StringWidth Mixed Medium 549.1 ns 890.7 ns 1252 ns 1.6x 2.2x uniwidth
StringWidth Mixed Short 157.4 ns 255.5 ns 366.1 ns 1.6x 2.3x uniwidth
StringWidth TUI Prompt 169.8 ns 270.2 ns 386.8 ns 1.5x 2.2x uniwidth
StringWidth TUI StatusLine 596.7 ns 940.1 ns 1317 ns 1.5x 2.2x uniwidth
StringWidth TUI TableHeader 573.7 ns 679.9 ns 942.2 ns 1.1x 1.6x uniwidth
StringWidth ZWJ 190.0 ns 218.1 ns 486.6 ns 1.1x 2.5x uniwidth
Raw benchmark output 
goos: linux
goarch: amd64
pkg: github.com/unilibs/uniwidth/bench
cpu: AMD EPYC 7763 64-Core Processor                
BenchmarkRuneWidth_ASCII_Uniwidth-4                  	49838874	         2.190 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_ASCII_Uniwidth-4                  	54926318	         2.179 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_ASCII_Uniwidth-4                  	54913222	         2.176 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_ASCII_GoRunewidth-4               	45334152	         2.493 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_ASCII_GoRunewidth-4               	47730303	         2.494 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_ASCII_GoRunewidth-4               	47421700	         2.497 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_CJK_Uniwidth-4                    	42694309	         2.801 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_CJK_Uniwidth-4                    	41525134	         2.800 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_CJK_Uniwidth-4                    	42749017	         2.814 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_CJK_GoRunewidth-4                 	 5646406	        21.89 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_CJK_GoRunewidth-4                 	 5544555	        21.64 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_CJK_GoRunewidth-4                 	 5521453	        21.65 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_Emoji_Uniwidth-4                  	47997312	         2.490 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_Emoji_Uniwidth-4                  	47697805	         2.490 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_Emoji_Uniwidth-4                  	44462786	         2.492 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_Emoji_GoRunewidth-4               	 8868778	        13.63 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_Emoji_GoRunewidth-4               	 8871834	        13.64 ns/op	       0 B/op	       0 allocs/op
BenchmarkRuneWidth_Emoji_GoRunewidth-4               	 8823595	        13.63 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_Uniwidth-4          	21458713	         5.678 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_Uniwidth-4          	21415515	         5.643 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_Uniwidth-4          	21275037	         5.606 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_GoRunewidth-4       	 1619046	        74.20 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_GoRunewidth-4       	 1620382	        74.12 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_GoRunewidth-4       	 1619709	        74.29 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_Uniseg-4            	 1000000	       113.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_Uniseg-4            	  913388	       113.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Short_Uniseg-4            	 1000000	       113.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_Uniwidth-4         	 7455320	        16.19 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_Uniwidth-4         	 7415560	        16.15 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_Uniwidth-4         	 7426452	        16.17 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_GoRunewidth-4      	  187984	       636.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_GoRunewidth-4      	  186658	       636.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_GoRunewidth-4      	  188799	       636.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_Uniseg-4           	  125059	       959.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_Uniseg-4           	  124186	       957.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Medium_Uniseg-4           	  125232	       957.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_Uniwidth-4           	 1788534	        67.22 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_Uniwidth-4           	 1785237	        67.11 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_Uniwidth-4           	 1786659	        67.43 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_GoRunewidth-4        	   35353	      3393 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_GoRunewidth-4        	   35276	      3388 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_GoRunewidth-4        	   35334	      3384 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_Uniseg-4             	   23497	      5117 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_Uniseg-4             	   23468	      5122 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ASCII_Long_Uniseg-4             	   23386	      5127 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_Uniwidth-4            	 1601445	        74.85 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_Uniwidth-4            	 1606744	        74.73 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_Uniwidth-4            	 1604410	        74.59 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_GoRunewidth-4         	  710343	       158.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_GoRunewidth-4         	  760442	       157.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_GoRunewidth-4         	  682083	       157.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_Uniseg-4              	  586581	       211.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_Uniseg-4              	  517755	       210.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Short_Uniseg-4              	  560793	       209.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Medium_Uniwidth-4           	  156175	       738.9 ns/op	     144 B/op	       1 allocs/op
BenchmarkStringWidth_CJK_Medium_Uniwidth-4           	  152496	       745.5 ns/op	     144 B/op	       1 allocs/op
BenchmarkStringWidth_CJK_Medium_Uniwidth-4           	  154004	       743.3 ns/op	     144 B/op	       1 allocs/op
BenchmarkStringWidth_CJK_Medium_GoRunewidth-4        	   77684	      1544 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Medium_GoRunewidth-4        	   77914	      1546 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Medium_GoRunewidth-4        	   78126	      1549 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Medium_Uniseg-4             	   60061	      2009 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Medium_Uniseg-4             	   59727	      2010 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_CJK_Medium_Uniseg-4             	   59646	      2005 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_Uniwidth-4          	  754402	       157.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_Uniwidth-4          	  746642	       158.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_Uniwidth-4          	  756145	       157.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_GoRunewidth-4       	  437407	       255.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_GoRunewidth-4       	  462003	       256.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_GoRunewidth-4       	  446251	       255.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_Uniseg-4            	  322711	       366.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_Uniseg-4            	  323512	       366.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Short_Uniseg-4            	  320295	       365.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Medium_Uniwidth-4         	  198525	       555.2 ns/op	     192 B/op	       1 allocs/op
BenchmarkStringWidth_Mixed_Medium_Uniwidth-4         	  195218	       547.1 ns/op	     192 B/op	       1 allocs/op
BenchmarkStringWidth_Mixed_Medium_Uniwidth-4         	  193483	       549.1 ns/op	     192 B/op	       1 allocs/op
BenchmarkStringWidth_Mixed_Medium_GoRunewidth-4      	  131833	       891.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Medium_GoRunewidth-4      	  134012	       888.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Medium_GoRunewidth-4      	  133040	       890.7 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Medium_Uniseg-4           	   95731	      1251 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Medium_Uniseg-4           	   96200	      1252 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Mixed_Medium_Uniseg-4           	   95924	      1258 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_Uniwidth-4          	  704008	       168.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_Uniwidth-4          	  702706	       161.7 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_Uniwidth-4          	  735058	       162.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_GoRunewidth-4       	  446917	       266.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_GoRunewidth-4       	  426264	       266.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_GoRunewidth-4       	  439464	       266.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_Uniseg-4            	  301629	       400.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_Uniseg-4            	  298545	       397.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Short_Uniseg-4            	  295819	       399.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Medium_Uniwidth-4         	  162589	       660.0 ns/op	     240 B/op	       1 allocs/op
BenchmarkStringWidth_Emoji_Medium_Uniwidth-4         	  165393	       658.9 ns/op	     240 B/op	       1 allocs/op
BenchmarkStringWidth_Emoji_Medium_Uniwidth-4         	  165699	       665.0 ns/op	     240 B/op	       1 allocs/op
BenchmarkStringWidth_Emoji_Medium_GoRunewidth-4      	  118756	      1010 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Medium_GoRunewidth-4      	  115443	      1009 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Medium_GoRunewidth-4      	  119396	      1011 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Medium_Uniseg-4           	   83901	      1433 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Medium_Uniseg-4           	   83782	      1429 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Emoji_Medium_Uniseg-4           	   83689	      1436 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_Uniwidth-4           	  676634	       169.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_Uniwidth-4           	  705380	       169.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_Uniwidth-4           	  705912	       170.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_GoRunewidth-4        	  411105	       270.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_GoRunewidth-4        	  441027	       270.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_GoRunewidth-4        	  426532	       270.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_Uniseg-4             	  309457	       386.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_Uniseg-4             	  311006	       386.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_Prompt_Uniseg-4             	  310588	       387.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_TableHeader_Uniwidth-4      	  194296	       574.5 ns/op	     144 B/op	       1 allocs/op
BenchmarkStringWidth_TUI_TableHeader_Uniwidth-4      	  192854	       573.7 ns/op	     144 B/op	       1 allocs/op
BenchmarkStringWidth_TUI_TableHeader_Uniwidth-4      	  194044	       567.0 ns/op	     144 B/op	       1 allocs/op
BenchmarkStringWidth_TUI_TableHeader_GoRunewidth-4   	  176648	       676.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_TableHeader_GoRunewidth-4   	  177211	       681.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_TableHeader_GoRunewidth-4   	  178377	       679.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_TableHeader_Uniseg-4        	  127844	       942.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_TableHeader_Uniseg-4        	  128294	       942.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_TableHeader_Uniseg-4        	  127563	       941.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_StatusLine_Uniwidth-4       	  180753	       602.2 ns/op	     224 B/op	       1 allocs/op
BenchmarkStringWidth_TUI_StatusLine_Uniwidth-4       	  172407	       596.7 ns/op	     224 B/op	       1 allocs/op
BenchmarkStringWidth_TUI_StatusLine_Uniwidth-4       	  184326	       589.8 ns/op	     224 B/op	       1 allocs/op
BenchmarkStringWidth_TUI_StatusLine_GoRunewidth-4    	  124364	       939.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_StatusLine_GoRunewidth-4    	  126272	       951.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_StatusLine_GoRunewidth-4    	  126242	       940.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_StatusLine_Uniseg-4         	   91730	      1318 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_StatusLine_Uniseg-4         	   90500	      1309 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_TUI_StatusLine_Uniseg-4         	   87979	      1317 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_Uniwidth-4                	 1000000	       111.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_Uniwidth-4                	 1000000	       111.7 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_Uniwidth-4                	 1000000	       111.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_GoRunewidth-4             	  516010	       233.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_GoRunewidth-4             	  515590	       234.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_GoRunewidth-4             	  513493	       234.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_Uniseg-4                  	  389570	       310.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_Uniseg-4                  	  386178	       310.7 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Flags_Uniseg-4                  	  378362	       310.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_Uniwidth-4                  	  637665	       190.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_Uniwidth-4                  	  630670	       189.8 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_Uniwidth-4                  	  602185	       190.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_GoRunewidth-4               	  532197	       217.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_GoRunewidth-4               	  514846	       218.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_GoRunewidth-4               	  551551	       218.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_Uniseg-4                    	  246598	       481.1 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_Uniseg-4                    	  246361	       486.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_ZWJ_Uniseg-4                    	  248539	       487.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_Uniwidth-4             	  360996	       289.7 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_Uniwidth-4             	  409076	       289.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_Uniwidth-4             	  417097	       290.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_GoRunewidth-4          	  295912	       404.7 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_GoRunewidth-4          	  290848	       405.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_GoRunewidth-4          	  291074	       404.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_Uniseg-4               	  170401	       707.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_Uniseg-4               	  169340	       707.0 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringWidth_Combined_Uniseg-4               	  169815	       704.8 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/unilibs/uniwidth/bench	20.124s

CI runners have ~10-20% variance. For accurate results, run locally: cd bench && go test -bench=. -benchmem -count=10

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github-actions bot commented Feb 4, 2026

Regression Detection

Comparing main → PR #2

Summary: geomean 37.72n 36.46n -14.83%

⚠️ Potential regressions detected:

StringWidth_CJK_Short-4                52.11n ± ∞ ¹    71.21n ± ∞ ¹  +36.65% (p=0.008 n=5)
StringWidth_CJK_Medium-4               575.3n ± ∞ ¹    715.8n ± ∞ ¹  +24.42% (p=0.008 n=5)
StringWidth_Mixed_Short-4              96.85n ± ∞ ¹   149.70n ± ∞ ¹  +54.57% (p=0.008 n=5)
StringWidth_Mixed_Medium-4             341.3n ± ∞ ¹    505.8n ± ∞ ¹  +48.20% (p=0.008 n=5)
StringWidth_Emoji_Short-4              101.7n ± ∞ ¹    153.1n ± ∞ ¹  +50.54% (p=0.008 n=5)
StringWidth_Emoji_Medium-4             410.7n ± ∞ ¹    624.9n ± ∞ ¹  +52.15% (p=0.008 n=5)
StringWidth_TUI_Prompt-4               92.97n ± ∞ ¹   158.20n ± ∞ ¹  +70.16% (p=0.008 n=5)
StringWidth_TUI_TableHeader-4          530.1n ± ∞ ¹    561.1n ± ∞ ¹   +5.85% (p=0.008 n=5)
StringWidth_TUI_StatusLine-4           361.4n ± ∞ ¹    561.8n ± ∞ ¹  +55.45% (p=0.008 n=5)
Conformance/ControlChars-4             1.869n ± ∞ ¹    2.492n ± ∞ ¹  +33.33% (p=0.008 n=5)
Full benchstat output 
goos: linux
goarch: amd64
pkg: github.com/unilibs/uniwidth
cpu: AMD EPYC 7763 64-Core Processor                
                                   │ base-bench.txt │             pr-bench.txt             │
                                   │     sec/op     │    sec/op      vs base               │
RuneWidth_ASCII-4                      2.494n ± ∞ ¹    2.187n ± ∞ ¹  -12.31% (p=0.008 n=5)
RuneWidth_CJK-4                        2.494n ± ∞ ¹    2.497n ± ∞ ¹        ~ (p=0.143 n=5)
RuneWidth_Emoji-4                      2.803n ± ∞ ¹    2.806n ± ∞ ¹        ~ (p=0.190 n=5)
StringWidth_ASCII_Short-4              8.392n ± ∞ ¹    5.929n ± ∞ ¹  -29.35% (p=0.008 n=5)
StringWidth_ASCII_Medium-4             46.59n ± ∞ ¹    16.81n ± ∞ ¹  -63.92% (p=0.008 n=5)
StringWidth_ASCII_Long-4              231.30n ± ∞ ¹    63.15n ± ∞ ¹  -72.70% (p=0.008 n=5)
StringWidth_CJK_Short-4                52.11n ± ∞ ¹    71.21n ± ∞ ¹  +36.65% (p=0.008 n=5)
StringWidth_CJK_Medium-4               575.3n ± ∞ ¹    715.8n ± ∞ ¹  +24.42% (p=0.008 n=5)
StringWidth_Mixed_Short-4              96.85n ± ∞ ¹   149.70n ± ∞ ¹  +54.57% (p=0.008 n=5)
StringWidth_Mixed_Medium-4             341.3n ± ∞ ¹    505.8n ± ∞ ¹  +48.20% (p=0.008 n=5)
StringWidth_Emoji_Short-4              101.7n ± ∞ ¹    153.1n ± ∞ ¹  +50.54% (p=0.008 n=5)
StringWidth_Emoji_Medium-4             410.7n ± ∞ ¹    624.9n ± ∞ ¹  +52.15% (p=0.008 n=5)
IsASCIIOnly_Short_ASCII-4              2.548n ± ∞ ¹    2.628n ± ∞ ¹        ~ (p=0.151 n=5)
IsASCIIOnly_Medium_ASCII-4            15.640n ± ∞ ¹    6.732n ± ∞ ¹  -56.96% (p=0.008 n=5)
IsASCIIOnly_Long_ASCII-4               79.33n ± ∞ ¹    24.49n ± ∞ ¹  -69.13% (p=0.008 n=5)
IsASCIIOnly_Short_NonASCII-4          2.7490n ± ∞ ¹   0.9361n ± ∞ ¹  -65.95% (p=0.008 n=5)
StringWidth_TUI_Prompt-4               92.97n ± ∞ ¹   158.20n ± ∞ ¹  +70.16% (p=0.008 n=5)
StringWidth_TUI_TableHeader-4          530.1n ± ∞ ¹    561.1n ± ∞ ¹   +5.85% (p=0.008 n=5)
StringWidth_TUI_StatusLine-4           361.4n ± ∞ ¹    561.8n ± ∞ ¹  +55.45% (p=0.008 n=5)
Conformance/AllCategories-4            62.56n ± ∞ ¹    44.54n ± ∞ ¹  -28.80% (p=0.008 n=5)
Conformance/CombiningMarks-4           15.29n ± ∞ ¹    14.70n ± ∞ ¹   -3.86% (p=0.008 n=5)
Conformance/ControlChars-4             1.869n ± ∞ ¹    2.492n ± ∞ ¹  +33.33% (p=0.008 n=5)
RuneWidthWithOptions/ASCII-4           22.31n ± ∞ ¹    22.60n ± ∞ ¹        ~ (p=0.310 n=5)
RuneWidthWithOptions/Ambiguous-4       45.41n ± ∞ ¹    26.38n ± ∞ ¹  -41.91% (p=0.008 n=5)
RuneWidthWithOptions/CJK-4             22.43n ± ∞ ¹    22.59n ± ∞ ¹        ~ (p=0.151 n=5)
StringWidthWithOptions/ASCII-4         29.41n ± ∞ ¹    25.05n ± ∞ ¹  -14.82% (p=0.008 n=5)
StringWidthWithOptions/Ambiguous-4     99.46n ± ∞ ¹    55.56n ± ∞ ¹  -44.14% (p=0.008 n=5)
StringWidthWithOptions/Mixed-4        115.70n ± ∞ ¹    70.42n ± ∞ ¹  -39.14% (p=0.008 n=5)
StringWidth_ZWJ_Family-4                               84.86n ± ∞ ¹
StringWidth_ZWJ_CoupleHeart-4                          72.85n ± ∞ ¹
StringWidth_EmojiModifier-4                            33.18n ± ∞ ¹
StringWidth_ZWJ_Mixed-4                                298.3n ± ∞ ¹
geomean                                37.72n          36.46n        -14.83%
¹ need >= 6 samples for confidence interval at level 0.95

                                   │ base-bench.txt │            pr-bench.txt             │
                                   │      B/op      │    B/op      vs base                │
RuneWidth_ASCII-4                       0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidth_CJK-4                         0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidth_Emoji-4                       0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ASCII_Short-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ASCII_Medium-4              0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ASCII_Long-4                0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_CJK_Short-4                 0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_CJK_Medium-4                144.0 ± ∞ ¹   144.0 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Mixed_Short-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Mixed_Medium-4              192.0 ± ∞ ¹   192.0 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Emoji_Short-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Emoji_Medium-4              240.0 ± ∞ ¹   240.0 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Short_ASCII-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Medium_ASCII-4              0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Long_ASCII-4                0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Short_NonASCII-4            0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_TUI_Prompt-4                0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_TUI_TableHeader-4           144.0 ± ∞ ¹   144.0 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_TUI_StatusLine-4            224.0 ± ∞ ¹   224.0 ± ∞ ¹       ~ (p=1.000 n=5) ²
Conformance/AllCategories-4             0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
Conformance/CombiningMarks-4            0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
Conformance/ControlChars-4              0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidthWithOptions/ASCII-4            16.00 ± ∞ ¹   16.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidthWithOptions/Ambiguous-4        16.00 ± ∞ ¹   16.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidthWithOptions/CJK-4              16.00 ± ∞ ¹   16.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidthWithOptions/ASCII-4          16.00 ± ∞ ¹   16.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidthWithOptions/Ambiguous-4      16.00 ± ∞ ¹   16.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidthWithOptions/Mixed-4          16.00 ± ∞ ¹   16.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ZWJ_Family-4                              0.000 ± ∞ ¹
StringWidth_ZWJ_CoupleHeart-4                         0.000 ± ∞ ¹
StringWidth_EmojiModifier-4                           0.000 ± ∞ ¹
StringWidth_ZWJ_Mixed-4                               0.000 ± ∞ ¹
geomean                                           ³                +0.00%               ³
¹ need >= 6 samples for confidence interval at level 0.95
² all samples are equal
³ summaries must be >0 to compute geomean

                                   │ base-bench.txt │            pr-bench.txt             │
                                   │   allocs/op    │  allocs/op   vs base                │
RuneWidth_ASCII-4                       0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidth_CJK-4                         0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidth_Emoji-4                       0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ASCII_Short-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ASCII_Medium-4              0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ASCII_Long-4                0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_CJK_Short-4                 0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_CJK_Medium-4                1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Mixed_Short-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Mixed_Medium-4              1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Emoji_Short-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_Emoji_Medium-4              1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Short_ASCII-4               0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Medium_ASCII-4              0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Long_ASCII-4                0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
IsASCIIOnly_Short_NonASCII-4            0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_TUI_Prompt-4                0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_TUI_TableHeader-4           1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_TUI_StatusLine-4            1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
Conformance/AllCategories-4             0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
Conformance/CombiningMarks-4            0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
Conformance/ControlChars-4              0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidthWithOptions/ASCII-4            1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidthWithOptions/Ambiguous-4        1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
RuneWidthWithOptions/CJK-4              1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidthWithOptions/ASCII-4          1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidthWithOptions/Ambiguous-4      1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidthWithOptions/Mixed-4          1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
StringWidth_ZWJ_Family-4                              0.000 ± ∞ ¹
StringWidth_ZWJ_CoupleHeart-4                         0.000 ± ∞ ¹
StringWidth_EmojiModifier-4                           0.000 ± ∞ ¹
StringWidth_ZWJ_Mixed-4                               0.000 ± ∞ ¹
geomean                                           ³                +0.00%               ³
¹ need >= 6 samples for confidence interval at level 0.95
² all samples are equal
³ summaries must be >0 to compute geomean

@kolkov kolkov merged commit 68c3057 into main Feb 4, 2026
9 checks passed
@kolkov kolkov deleted the release/0.2.0 branch February 4, 2026 23:40
@kolkov kolkov mentioned this pull request Feb 4, 2026
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