Vector Widening Floating-Point Multiply和Vector Single-Width Floating-Point Multiply/Divide Instructions

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一直不理解Vector Widening Floating-Point Multiply和Vector Single-Width Floating-Point Multiply的区别？在看官方给的v扩展手册0.7.1时，没有发现例子，可以解答一下嘛？万分感谢！
# Floating-point multiply vfmul.vv vd, vs2, vs1, vm # Vector-vector

# Widening floating-point multiply vfwmul.vv vd, vs2, vs1, vm # vector-vector