The embodiment of the invention discloses a
leading zero detection circuit which comprises a first selection module, a comparison module and a second selection module, the input end of the second selection module is connected with the output end of the first selection module, and the selection end of the second selection module is connected with the output end of the comparison module; the
floating point operand is equally divided into N sections of input numbers, each group of input ends of the first selection module inputs a group of preset constants, each section of input number is input into one selection end of the first selection module, and the first selection module is configured to output N
leading zero data of the
floating point operand in parallel; the comparison module is configured to input each segment of input number and output a preset identifier corresponding to each segment of input number in parallel; and the output end of the second selection module is configured to output the
leading zero quantity according to N preset identifiers, so that segmentation parallel and result cascading are realized, the
stage number of a key path can be greatly reduced, and the implementation
delay of the leading zero
detector is remarkably reduced.