Don't initialize the first parameter of _BitScanForward* functions

Like the document example, no need to initialize `r` to 0. https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64
2021-09-25 16:36:53 +08:00
parent 95f492ea17
commit e5ba858270
5 changed files with 10 additions and 12 deletions
@@ -391,7 +391,7 @@ MEM_STATIC unsigned ZSTD_countTrailingZeros(size_t val)
 #           if STATIC_BMI2
                return _tzcnt_u64(val);
 #           else
-                unsigned long r = 0;
+                unsigned long r;
                return _BitScanForward64( &r, (U64)val ) ? (unsigned)(r >> 3) : 0;
 #           endif
 #       elif defined(__GNUC__) && (__GNUC__ >= 4)
@@ -409,7 +409,7 @@ MEM_STATIC unsigned ZSTD_countTrailingZeros(size_t val)
 #       endif
    } else { /* 32 bits */
 #       if defined(_MSC_VER)
-            unsigned long r=0;
+            unsigned long r;
            return _BitScanForward( &r, (U32)val ) ? (unsigned)(r >> 3) : 0;
 #       elif defined(__GNUC__) && (__GNUC__ >= 3)
            return (__builtin_ctz((U32)val) >> 3);