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

问题在于乘法指令的结果可能会有其操作数的两倍之长。

youdao

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

现在，SPU上的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)。

youdao

This is done with the mpyu instruction (multiply unsigned).

这可以通过 mpyu 指令（无符号相乘）实现。

youdao