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In computing, the **most significant bit** (**MSB**, also called the **high-order bit**) is the bit position in a binary number having the greatest value. The MSB is sometimes referred to as the **left-most bit** due to the convention in positional notation of writing more significant digits further to the left.

The MSB can also correspond to the sign bit of a signed binary number in one's or two's complement notation, "1" meaning negative and "0" meaning positive.

It is common to assign each bit a position number, ranging from zero to N-1, where N is the number of bits in the binary representation used. Normally, this is simply the exponent for the corresponding bit weight in base-2 (such as in `2`

). Although a few CPU manufacturers assign bit numbers the opposite way (which is not the same as different endianness), the ^{31}..2^{0}*MSB* unambiguously remains the *most* significant bit. This may be one of the reasons why the term *MSB* is often used instead of a bit number, although the primary reason is probably that different number representations use different numbers of bits.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Most_significant_bit

In software, **find first set** (**ffs**) or **find first one** is a bit operation that, given an unsigned machine word, identifies the least significant index or position of the bit set to one in the word. A nearly equivalent operation is **count trailing zeros** (**ctz**) or **number of trailing zeros** (**ntz**), which counts the number of zero bits following the least significant one bit. The complementary operation that finds the index or position of the most significant set bit is *log base 2*, so called because it computes the binary logarithm . This is closely related to **count leading zeros** (**clz**) or **number of leading zeros** (**nlz**), which counts the number of zero bits preceding the most significant one bit. These four operations also have negated versions:

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Find_first_set

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