How to use the multiply and accumulate intrinsics in ARM Cortex-a8?

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how to use the Multiply-Accumulate intrinsics provided by GCC?

float32x4_t vmlaq_f32 (float32x4_t , float32x4_t , float32x4_t);

Can anyone explain what three parameters I have to pass to this function. I mean the Source and destination registers and what the function returns?

Help!!!

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