restrict BitScanForward() to VS2005+

suggested by @aqrit in #947
2020-11-14 14:26:08 -08:00 · 2020-11-14 14:26:08 -08:00 · 581c459b4e
commit 581c459b4e
parent 80751571ae
1 changed files with 1 additions and 1 deletions
--- a/lib/lz4.c
+++ b/lib/lz4.c
@ -533,7 +533,7 @@ static unsigned LZ4_NbCommonBytes (reg_t val)
            return (unsigned)(((U64)((val & (m - 1)) * m)) >> 56);
 #       endif
        } else /* 32 bits */ {
-#       if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+#       if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(LZ4_FORCE_SW_BITCOUNT)
            unsigned long r;
            _BitScanForward(&r, (U32)val);
            return (unsigned)r >> 3;