fast check for ascii

danielaparker · danielaparker · commit 485b4fb2f7c5 · 2026-07-02T10:19:32.000-04:00
diff --git a/include/jsoncons/utility/unicode_traits.hpp b/include/jsoncons/utility/unicode_traits.hpp
@@ -1150,10 +1150,10 @@ namespace unicode_traits {
         conv_errc  result{};
         while (it != end) 
         {
-            if ((end - it) >= 8)
+            /*if ((end - it) >= 8)
             {
-                while (true) JSONCONS_REPEAT8({if (JSONCONS_LIKELY((trailing_bytes_for_utf8[*it] == 0) && (*it >= 0x80 && *it < 0xC2))) ++it; else break;})
-            }
+                while (true) JSONCONS_REPEAT8({if (JSONCONS_LIKELY((trailing_bytes_for_utf8[*it] == 0) && !(*it >= 0x80 && *it < 0xC2))) ++it; else break;})
+            }*/
             const std::size_t len = static_cast<std::size_t>(trailing_bytes_for_utf8[*it]) + 1;
             if (len > (std::size_t)(end - it))
             {

Original file line number	Diff line number	Diff line change
`@@ -1150,10 +1150,10 @@ namespace unicode_traits {`
`1150`	`1150`	`conv_errc result{};`
`1151`	`1151`	`while (it != end)`
`1152`	`1152`	`{`
`1153`		`- if ((end - it) >= 8)`
	`1153`	`+ /*if ((end - it) >= 8)`
`1154`	`1154`	`{`
`1155`		`- while (true) JSONCONS_REPEAT8({if (JSONCONS_LIKELY((trailing_bytes_for_utf8[it] == 0) && (it >= 0x80 && *it < 0xC2))) ++it; else break;})`
`1156`		`- }`
	`1155`	`+ while (true) JSONCONS_REPEAT8({if (JSONCONS_LIKELY((trailing_bytes_for_utf8[it] == 0) && !(it >= 0x80 && *it < 0xC2))) ++it; else break;})`
	`1156`	`+ }*/`
`1157`	`1157`	`const std::size_t len = static_cast<std::size_t>(trailing_bytes_for_utf8[*it]) + 1;`
`1158`	`1158`	`if (len > (std::size_t)(end - it))`
`1159`	`1159`	`{`