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balsa user: how to implement multiplication in balsa

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sages

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when I'm trying to multiply A by 2, it seems there is no pre-defined macro in balsa.
Thus, I'm trying to use shift method to implement multiplication as below:

variable A : 8 bits

type A8 is array 8 of bit
type B8 is 8 bits

B := (A8 {0}@{(#A)[0:6] as B8})

but there is an error message occure: expression list has fewer elements than expected

anyone could solve this problem?

PS: B := ( (#A)[0:6]@{0} as B8 ) this is right, but not multiplicaiton
 

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