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    • 3. 发明授权
    • Zero indication forwarding for floating point unit power reduction
    • 用于浮点单元功率降低的零指示转发
    • US08255726B2
    • 2012-08-28
    • US12176191
    • 2008-07-18
    • Harry S. BarowskiMaarten J. BoersmaSilvia M. MuellerTim NiggemeierJochen Preiss
    • Harry S. BarowskiMaarten J. BoersmaSilvia M. MuellerTim NiggemeierJochen Preiss
    • G06F1/00
    • G06F1/3203G06F1/3246G06F1/3287G06F9/3001G06F9/30105G06F9/30192Y02D10/171
    • A method, system and computer program product for reducing power consumption when processing mathematical operations. Power may be reduced in processor hardware devices that receive one or more operands from an execution unit that executes instructions. A circuit detects when at least one operand of multiple operands is a zero operand, prior to the operand being forwarded to an execution component for completing a mathematical operation. When at least one operand is a zero operand or at least one operand is “unordered”, a flag is set that triggers a gating of a clock signal. The gating of the clock signal disables one or more processing stages and/or devices, which perform the mathematical operation. Disabling the stages and/or devices enables computing the correct result of the mathematical operation on a reduced data path. When a device(s) is disabled, the device may be powered off until the device is again required by subsequent operations.
    • 一种用于在处理数学运算时降低功耗的方法,系统和计算机程序产品。 在从执行指令的执行单元接收一个或多个操作数的处理器硬件设备中,功率可能会降低。 在将操作数转发到执行组件以完成数学运算之前,电路检测多个操作数的至少一个操作数是否为零操作数。 当至少一个操作数为零操作数或至少一个操作数为“无序”时,设置触发时钟信号选通的标志。 时钟信号的门控禁用执行数学运算的一个或多个处理级和/或器件。 禁用级和/或设备可以在减少的数据路径上计算数学运算的正确结果。 当设备被禁用时,可能会关闭设备电源,直到后续操作再次要求设备。