Allow using MSVC intrinsics with older versions.

diff --git a/src/lj_def.h b/src/lj_def.h
index b52d5d1b7691be0342b6cdae22fb18a987e20fb8..26cf7fdcb55f994dd0c3d7ded10d65f327fc565c 100644 (file)
--- a/src/lj_def.h
+++ b/src/lj_def.h
@@ -242,6 +242,8 @@ static LJ_AINLINE uint32_t lj_getu32(const void *p)
 #define LJ_FASTCALL    __fastcall
 #endif
 
+#pragma intrinsic(_BitScanForward)
+#pragma intrinsic(_BitScanReverse)
 unsigned char _BitScanForward(uint32_t *, unsigned long);
 unsigned char _BitScanReverse(uint32_t *, unsigned long);
 unsigned long _byteswap_ulong(unsigned long);