perf: ~25% faster utf16.isWellFormed

ChALkeR · ChALkeR · commit 58a0c1f2003e · 2026-01-06T04:38:57.000+05:30
diff --git a/fallback/utf16.js b/fallback/utf16.js
@@ -161,7 +161,7 @@ export function isWellFormed(u16) {
       const b = u32[i + 1]
       const c = u32[i + 2]
       const d = u32[i + 3]
-      if (a & 0x80_00_80_00 || b & 0x80_00_80_00 || c & 0x80_00_80_00 || d & 0x80_00_80_00) break
+      if ((a | b | c | d) & 0x80_00_80_00) break
     }
 
     for (; i < u32length; i++) if (u32[i] & 0x80_00_80_00) break

Original file line number	Diff line number	Diff line change
`@@ -161,7 +161,7 @@ export function isWellFormed(u16) {`
`161`	`161`	`const b = u32[i + 1]`
`162`	`162`	`const c = u32[i + 2]`
`163`	`163`	`const d = u32[i + 3]`
`164`		`- if (a & 0x80_00_80_00 \|\| b & 0x80_00_80_00 \|\| c & 0x80_00_80_00 \|\| d & 0x80_00_80_00) break`
	`164`	`+ if ((a \| b \| c \| d) & 0x80_00_80_00) break`
`165`	`165`	`}`
`166`	`166`
`167`	`167`	`for (; i < u32length; i++) if (u32[i] & 0x80_00_80_00) break`