From 3f00059bebad0220ac79b40a6b45d785f4baabfa Mon Sep 17 00:00:00 2001
From: Adam Cogdell <adamcogdell@google.com>
Date: Thu, 5 Jun 2025 22:27:35 +0000
Subject: [PATCH] Fix fuzzer range error for scalar parity check.

---
 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h b/unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
index 5f95fd0ca..1c3ce8738 100644
--- a/unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
+++ b/unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
@@ -1455,7 +1455,7 @@ struct zeta_impl {
 
     if (q <= zero) {
       if (q == numext::floor(q)) {
-        if (x == numext::floor(x) && long(x) % 2 == 0) {
+        if (numext::rint(Scalar(0.5) * x) == Scalar(0.5) * x) {
           return maxnum;
         } else {
           return nan;