From 69e9d9767a0bd1d324f8271d820220cd4e87db7d Mon Sep 17 00:00:00 2001
From: scribam <scribam@users.noreply.github.com>
Date: Sat, 31 Aug 2019 12:16:42 +0200
Subject: [PATCH] windows: Add fallback for _BitScanForward64 on 32-bits system

---
 core/log/BitSet.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/core/log/BitSet.h b/core/log/BitSet.h
index 4bf909df8..7fc0246f8 100644
--- a/core/log/BitSet.h
+++ b/core/log/BitSet.h
@@ -45,7 +45,13 @@ inline int LeastSignificantSetBit(u32 val)
 inline int LeastSignificantSetBit(u64 val)
 {
   unsigned long index;
+#ifdef _WIN64
   _BitScanForward64(&index, val);
+#else
+  if (!_BitScanForward(&index, (u32)val) && _BitScanForward(&index, (u32)(val >> 32))) {
+    index += 32;
+  }
+#endif
   return (int)index;
 }
 #else