G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 7/50 (2006.01) G06F 5/01 (2006.01) G06F 7/38 (2006.01) G06F 7/52 (2006.01)
Patent
CA 2050799
Abstract of the Disclosure: In a floating-point arithmetic unit for performing floating-point arithmetic of first and second input data which are represented by a floating-point representation and composed of first and second exponent parts and first and second mantissa parts, a shift amount calculating circuit comprises first and second subtracters (26, 27) supplied with lower (n + 1) bits of the first and the second exponent parts. The first subtracter subtracts a first lower number (#EA1) from a second lower number (#EB1) to produce a first difference signal (RS1). The second subtracter subtracts the second lower number (#EB1) from the first lower number (#EA1) to produce a second difference signal (RS1). Supplied with the first and the second exponent parts, an exponent comparing unit (28) compares the first exponent part with the second exponent part to produce a comparison result signal (CP1, CP2, CP3, CP4). Responsive to the comparison result signal, a first selector (31) selects one of the first difference signal and first and second value signals ("0", "64") as a first right-shift amount signal (SD1). Responsive to the comparison result signal, a second selector (32) selects one of the second difference signal and the first and the second value signals as a second right-shift amount signal (SD2).
Corporation Nec
Smart & Biggar
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