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1. (WO2018038830) VARIABLE PRECISION FLOATING-POINT MULTIPLIER

Pub. No.:    WO/2018/038830    International Application No.:    PCT/US2017/043154
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Fri Jul 21 01:59:59 CEST 2017
IPC: G06F 7/487
Applicants: ALTERA CORPORATION
Inventors: LANGHAMMER, Martin
Title: VARIABLE PRECISION FLOATING-POINT MULTIPLIER
Abstract:
Integrated circuits with specialized processing blocks are provided. The specialized processing blocks may include floating-point multiplier circuits that can be configured to support variable precision. A multiplier circuit may include a first carry-propagate adder (CPA), a second carry-propagate adder (CPA), and an associated rounding circuit. The first CPA may be wide enough to handle the required precision of the mantissa. In a bridged mode, the first CPA may borrow an additional bit from the second CPA while the rounding circuit will monitor the appropriate bits to select the proper multiplier output. A parallel prefix tree operable in a non-bridged mode or the bridged mode may be used to compute multiple multiplier outputs. The multiplier circuit may also include exponent and exception handling circuitry using various masks corresponding to the desired precision width.