From e4cae049ce9d581b7d3906fc9891b83283744bc1 Mon Sep 17 00:00:00 2001
From: Nursultan Zarlyk <nzarlyk@microsoft.com>
Date: Wed, 21 Sep 2022 15:43:44 +0200
Subject: [PATCH] Fix MSVC intrinsics

---
 src/lib/geogram/delaunay/periodic_delaunay_3d.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/lib/geogram/delaunay/periodic_delaunay_3d.cpp b/src/lib/geogram/delaunay/periodic_delaunay_3d.cpp
index cb5a990e1da4..81315db26cb7 100644
--- a/src/lib/geogram/delaunay/periodic_delaunay_3d.cpp
+++ b/src/lib/geogram/delaunay/periodic_delaunay_3d.cpp
@@ -122,7 +122,11 @@ namespace {
 #if defined(GEO_COMPILER_GCC_FAMILY)
 	return GEO::index_t(Numeric::uint32(__builtin_popcount(x)));
 #elif defined(GEO_COMPILER_MSVC)
-	return GEO::index_t(__popcnt(x));
+    #if defined(_M_ARM64)
+	return GEO::index_t(_CountOneBits(x));
+    #else
+ 	return GEO::index_t(__popcnt(x));
+    #endif
 #else
 	int result = 0;
 	for(int b=0; b<32; ++b) {