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1. 发明授权

US4823260A Mixed-precision floating point operations from a single instruction opcode 失效
标题翻译：来自单指令操作码的混合精度浮点运算
公开(公告)号：US4823260A
公开(公告)日：1989-04-18
申请号：US119547
申请日：1987-11-12
申请人： Michael T. Imel , Konrad Lai , Glenford J. Myers , Randy Steck , James Valerio
发明人： Michael T. Imel , Konrad Lai , Glenford J. Myers , Randy Steck , James Valerio
IPC分类号： G06F7/57 , G06F7/48
CPC分类号： G06F7/483 , G06F2207/3816 , G06F7/49957
摘要： Apparatus for performing mixed precision calculations in the floating point unit of a microprocessor from a single instruction opcode. 80-bit floating-point registers (44) may be specified as the source or destination address of a floating-point instruction. When the address range of the destination indicates (26) that a floating point register is addressed, the result of that operation is not rounded to the precision specified by the instruction, but is rounded (58) to extended 80-bit precision and loaded into the floating point register (FP-44). When the address range of the source indicates (26) that an FP register is addressed, the data is loaded from the FP register in extended precision, regardless of the precision specified by the instruction. In this way, real and long-real operations can be made to use extended precision numbers without explicitly specifying that in the opcode.
摘要翻译：用于从单个指令操作码在微处理器的浮点单元中执行混合精度计算的装置。可以将80位浮点寄存器（44）指定为浮点指令的源地址或目标地址。当目的地的地址范围指示（26）指定浮点寄存器时，该操作的结果不会舍入到指令指定的精度，而是舍入（58）到扩展的80位精度并加载到浮点寄存器（FP-44）。当源地址范围指示（26）FP寄存器被寻址时，无论指令指定的精度如何，数据都以扩展精度从FP寄存器加载。以这种方式，可以使用实际和长期实际的操作来使用扩展精度数字，而无需在操作码中明确指定。

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