================
@@ -4265,9 +4219,9 @@ bool AArch64AsmParser::parseSyspAlias(StringRef Name, 
SMLoc NameLoc,
 
   if (Tok.isNot(AsmToken::Identifier))
     return TokError("expected register identifier");
-  auto Result = tryParseSyspXzrPair(Operands);
-  if (Result.isNoMatch())
-    Result = tryParseGPRSeqPair(Operands);
+  auto Result = tryParseConsecutiveGPRSeqPair</*AllowXZRPair=*/true>(Operands);
+  if (Result.isFailure())
+    return true;
----------------
CarolineConcatto wrote:

Why we are not testing anymore Result.isNoMatch()?
What is the difference between  Result.isFailure() and Result.isSuccess()

https://github.com/llvm/llvm-project/pull/182410
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