================
@@ -1920,10 +1921,25 @@ bool Lexer::LexUnicodeIdentifierStart(Token &Result,
uint32_t C,
return true;
}
-static const char *
-fastParseASCIIIdentifier(const char *CurPtr,
- [[maybe_unused]] const char *BufferEnd) {
-#ifdef __SSE4_2__
+static const char *fastParseASCIIIdentifierScalar(const char *CurPtr) {
+ unsigned char C = *CurPtr;
+ while (isAsciiIdentifierContinue(C))
+ C = *++CurPtr;
+ return CurPtr;
+}
+
+// Fast path for lexing ASCII identifiers using SSE4.2 instructions.
+// Only enabled on x86/x86_64 when building with __SSE4_2__ enabled, or with a
+// compiler that supports the 'target' attribute, used for runtime dispatch.
+// Otherwise, we fall back to the scalar implementation.
+// We avoid runtime check on Windows because it is not yet well-supported.
+#if defined(__SSE4_2__) || (defined(__i386__) || defined(__x86_64__)) &&
\
----------------
Thibault-Monnier wrote:
I tried to simplify with macros in e8370a9512f6851d39256139b722b09e783e0305,
but I'm not satisfied with the result. What exactly were you proposing?
https://github.com/llvm/llvm-project/pull/175452
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