In software, find first set (ffs) or find first one is a bit operation that, given an unsigned machine word, identifies the index or position of the least significant 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 Failed to parse (Missing texvc executable; please see math/README to configure.): \lfloor \log_2 x\rfloor . 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:

There are two common variants of find first set, the POSIX definition which starts indexing of bits at 1, herein labelled ffs, and the variant which starts indexing of bits at zero, which is equivalent to ctz and so will be called by that name.

David Howell Evans (born 8 August 1961), more widely known by his stage name The Edge (or just Edge), is a musician best known as the guitarist, backing vocalist, and keyboardist of the Irish rock band U2. A member of the group since its inception, he has recorded 12 studio albums with the band and has released one solo record. As a guitarist, The Edge has crafted a minimalistic and textural style of playing. His use of a rhythmic delay effect yields a distinctive ambient, chiming sound that has become a signature of U2's music.

The Edge was born in England to a Welsh family, but was raised in Ireland after moving there as an infant. In 1976, at Mount Temple Comprehensive School, he formed U2 with his fellow students and his older brother Dik. Inspired by the ethos of punk rock and its basic arrangements, the group began to write its own material. They eventually became one of the most popular acts in popular music, with successful albums such as 1987's The Joshua Tree and 1991's Achtung Baby. Over the years, The Edge has experimented with various guitar effects and introduced influences from several genres of music into his own style, including American roots music, industrial music, and alternative rock. With U2, The Edge has also played keyboards, co-produced their 1993 record Zooropa, and occasionally contributed lyrics. The Edge met his second and current wife, Morleigh Steinberg, through her collaborations with the band.

Allah Rakha Rahman (born 6 January 1966 as A. S. Dileep Kumar) is an Indian composer, singer-songwriter, music producer, musician, multi-instrumentalist and philanthropist. Described as the world's most prominent and prolific film composer by Time, his works are notable for integrating eastern classical music with electronic music sounds, world music genres and traditional orchestral arrangements. He has won two Academy Awards, two Grammy Awards, a BAFTA Award, a Golden Globe, four National Film Awards, fifteen Filmfare Awards, thirteen Filmfare Awards South in addition to numerous other awards and nominations. His extensive body of work for film and the stage earned him the nickname “the Mozart of Madras” and several Tamil commentators and fans have coined him the nickname Isai Puyal (English: Music Storm). In 2009, Time placed Rahman in its list of World's Most Influential People. The UK based World Music magazine Songlines named him one of 'Tomorrow's World Music Icons' in August 2011.