Meaning of BSF in English
Bit Scan Forward (386+)
Scans source operand for first bit set.
Sets ZF if a bit is found set and loads the destination with an index to first set bit.
Clears ZF is no bits are found set.
BSF scans forward across bit pattern (0-n) while BSR scans in reverse (n-0).
Code analysis English vocabulary. Английский словарь анализа кода. 2012