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Apparatus and method for sharing overflow/underflow compare hardware in a floating-point multiply-accumulate (FMAC) or floating-point adder (FADD) unit
Apparatus and method for sharing overflow/underflow compare hardware in a floating-point multiply-accumulate (FMAC) or floating-point adder (FADD) unit
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机译:在浮点乘法累加(FMAC)或浮点加法器(FADD)单元中共享溢出/下溢比较硬件的设备和方法
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摘要
An apparatus and method provide for performing either an overflow or underflow comparison while minimizing overflow/underflow comparison circuitry. In particular, the apparatus and are implemented with overflow/underflow possible check circuitry that determines if a mathematical operation between a first exponent signal and a second exponent signal creates a potential overflow condition. The overflow/underflow possible check circuitry generates a signal indicating whether an overflow or underflow condition is a possibility. Exponent compare circuitry computes an actual overflow or underflow condition. The exponent compare circuitry computes an actual overflow condition if the signal, from the overflow/underflow possible check circuitry, indicates that overflow is possible, and computes an actual underflow condition if the signal, from the overflow/underflow possible check circuitry, does not indicate overflow is possible.
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