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请教msp430内部的硬件乘法器在c语言中如何使用



在c语言中,iar设置选择了硬件乘法器,但是感觉编译后并没有使用硬件乘法器运算量还是那么的大!

比如long x = 8,y= 1000;

时能硬件乘法器后,理论上x*y应该很快算完,

但是没有!花费了很多的时间,

请教如何搞呢

谢谢