Skip call to wcwidth for ascii in codepoint_width

bscuron · mawww · commit d82775b076cf · 2026-01-12T10:08:44.000+11:00
diff --git a/src/unicode.hh b/src/unicode.hh
@@ -101,7 +101,7 @@ inline bool is_identifier(Codepoint c) noexcept
 
 inline ColumnCount codepoint_width(Codepoint c) noexcept
 {
-    if (c == '\n')
+    if (c < 0x80) [[likely]]
         return 1;
     const auto width = wcwidth((wchar_t)c);
     return width >= 0 ? width : 1;

Original file line number	Diff line number	Diff line change
`@@ -101,7 +101,7 @@ inline bool is_identifier(Codepoint c) noexcept`
`101`	`101`
`102`	`102`	`inline ColumnCount codepoint_width(Codepoint c) noexcept`
`103`	`103`	`{`
`104`		`- if (c == '\n')`
	`104`	`+ if (c < 0x80) [[likely]]`
`105`	`105`	`return 1;`
`106`	`106`	`const auto width = wcwidth((wchar_t)c);`
`107`	`107`	`return width >= 0 ? width : 1;`