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两个有符号数乘法怎么用DSP指令实现？类似_dmpyu4指令是无符号与无符号数乘法，_dmpysu4指令是有符号与无符号数乘法，如何用DSP指令实现两个有符号数相乘？
_dmpy2是有符号乘法，请看下面编译器手册Table 8-7. TMS320C6600 C/C++ Compiler Intrinsics (continued)描述。https://www.ti.com/lit/ug/sprui04b/sprui04b.pdf
