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CN105808208B 具有条件指令的微处理器及其处理方法 有权

具有条件指令的微处理器及其处理方法
摘要：
一个执行条件非分支指令的微处理器。该微处理器包含：一预测器，用以提供关于一条件非分支指令的预测；一指令转译器，用以：在该预测预测该条件将不会被满足时，将该条件非分支指令转译为具有条件码的一不操作微指令，其中具有条件码的不操作微指令除了使执行单元启动来检查该预测外不会执行其它操作；以及在该预测预测该条件将会被满足时，将该条件非分支指令转译为单个具有条件码的可操作微指令以非条件地执行该操作；一执行管线，包括指令发布单元和多个执行单元，其中指令发布单元操作来发布该单个具有条件码的可操作微指令给多个执行单元的选择的一个，并且所选择的执行单元操作来执行该单个具有条件码的可操作微指令。
摘要（英）：

An ISA-defined instruction includes an immediate field having a first and second portions specifying first and second values, which instructs the microprocessor to perform an operation using a constant value as one of its source operands. The constant value is the first value rotated/shifted by a number of bits based on the second value. An instruction translator translates the instruction into one or more microinstructions. An execution pipeline executes the microinstructions generated by the instruction translator. The instruction translator, rather than the execution pipeline, generates the constant value for the execution pipeline as a source operand of at least one of the microinstructions for execution by the execution pipeline. Alternatively, if the immediate field value is not within a predetermined subset of values known by the instruction translator, the instruction translator generates, rather than the constant, a second microinstruction for execution by the execution pipeline to generate the constant.

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