Don't initialize the first parameter of _BitScanReverse* functions

Like the document example, no need to initialize `r` to 0. https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanreverse-bitscanreverse64
2021-09-25 16:36:53 +08:00
parent cc22042da0
commit 95f492ea17
11 changed files with 21 additions and 30 deletions
@@ -708,7 +708,7 @@ static unsigned ZSTD_NbCommonBytes (size_t val)
 #           if STATIC_BMI2
 			    return _lzcnt_u64(val) >> 3;
 #           else
-			    unsigned long r = 0;
+			    unsigned long r;
 			    return _BitScanReverse64(&r, (U64)val) ? (unsigned)(r >> 3) : 0;
 #           endif
 #       elif defined(__GNUC__) && (__GNUC__ >= 4)
@@ -723,7 +723,7 @@ static unsigned ZSTD_NbCommonBytes (size_t val)
 #       endif
        } else { /* 32 bits */
 #       if defined(_MSC_VER)
-            unsigned long r = 0;
+            unsigned long r;
            return _BitScanReverse( &r, (unsigned long)val ) ? (unsigned)(r >> 3) : 0;
 #       elif defined(__GNUC__) && (__GNUC__ >= 3)
            return (__builtin_clz((U32)val) >> 3);