windows: Add fallback for _BitScanForward64 on 32-bits system

2019-08-31 12:16:42 +02:00 · 2019-08-31 12:16:42 +02:00 · 69e9d9767a
parent a1e35d1d69
commit 69e9d9767a
1 changed files with 6 additions and 0 deletions
--- 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