• 问题在于乘法指令结果可能会有操作数两倍之长

    The problem is that the result of a multiply instruction can be twice as long as its operands.

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  • 由于乘法指令操作差异很大,因此SPUintrinsic并不其他操作一样将它们连接在一起。

    Because the multiplication instructions operate so differently, the SPU intrinsics do not coalesce them as much they do for other operations.

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  • 为了解决问题乘法指令使用每个32最低有效的16以便结果能够放进整个 32 位寄存器内

    To combat the problem, multiplication instructions only use the least-significant 16 bits of every 32-bit value so that the result will fit in the full 32-bit register.

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  • 现在SPU整数相乘指令多少有点问题特别是有符号乘法(使用mpy指令)。

    Now, the integer multiply instructions on the SPU are somewhat problematic, especially signed multiplication (using the mpy instruction).

    youdao

  • 文章某数值协处理器设计为例,研究了微指令格式确定以及微程序代码编写,并给出了编制的乘法微代码的实例

    Combined with the design of a math coprocessor, the paper dis-cusses how to determine microinstruction format and write microgram code. Multiplication code is presented as an example.

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  • 这些指令特点我们必须定义alu操作数ALE(地址锁存允许)运算,除了两个例外乘法和除法。

    Main characteristic of these instructions is that we have to define both ALU operands and ALE operation. Exceptions among these instructions are mul (multiply) instruction div (divide) instruction.

    youdao

  • 这些指令特点我们必须定义alu操作数ALE(地址锁存允许)运算,除了两个例外乘法和除法。

    Main characteristic of these instructions is that we have to define both ALU operands and ALE operation. Exceptions among these instructions are mul (multiply) instruction div (divide) instruction.

    youdao

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