Implementing bitwise operations using pari c library

I am new to using the PARI C library.

How can I perform bitwise ('and' or 'or') operations开发者_StackOverflow on the GEN type variables?

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using gbitand and gbitor ?

Declared in arith2.c see this link (sorry for the not so direct link):

GEN     gbitand(GEN x, GEN y)
GEN     gbitor(GEN x, GEN y)