From ef06642cc21b43f055f57be44c72ea26ade05bbc Mon Sep 17 00:00:00 2001
From: qbisi <qbisicwate@gmail.com>
Date: Mon, 15 Sep 2025 16:15:52 +0800
Subject: [PATCH] optional arm feature complex

---
 libsrc/core/simd_arm64.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libsrc/core/simd_arm64.hpp b/libsrc/core/simd_arm64.hpp
index 5bc833fd..4da11d3c 100644
--- a/libsrc/core/simd_arm64.hpp
+++ b/libsrc/core/simd_arm64.hpp
@@ -214,6 +214,7 @@ namespace ngcore
     return FNMA(SIMD<double,2> (a), b, c);
   }
 
+#ifdef __ARM_FEATURE_COMPLEX
   // ARM complex mult:
   // https://arxiv.org/pdf/1901.07294.pdf
   // c += a*b    (a0re, a0im, a1re, a1im, ...), 
@@ -231,7 +232,7 @@ namespace ngcore
     FMAComplex (a.Hi(), b.Hi(), chi);
     c = SIMD<double,4> (clo, chi);
   }
-
+#endif
   
 
   NETGEN_INLINE SIMD<double,2> operator+ (SIMD<double,2> a, SIMD<double,2> b)