Multi-operand floating point operations in a programmable integrated circuit device
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United States of America Patent
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Apr 2, 2013
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N/A
app pub date -
Sep 11, 2009
filing date -
Sep 11, 2009
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Abstract
A programmable logic device is programmed to add a plurality N of unnormalized numbers at once. Because the inputs are not normalized, they could all have different exponents. The largest exponent of the N exponents is found, and for each of the inputs, its mantissa is right-shifted at by the difference between the largest exponent and the exponent of that particular input. The N shifted mantissas are combined, optionally with sign data, in an (N+1):2 compressor to provide carry and save vectors which may be combined in a carry-propagate adder. Numbers may converted back to normalized form at the end of the operation. If necessary to avoid data loss, a number may be normalized after an intermediate step.
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