Writing my own backend. I am trying to understand reg_classes On the face of it, it looks like a list of registers with flags saying what classes they are in (int , float..)
So get_reg works down the table looking for registers of the right class, fine, got it. But the RC_RET function uses a register class as an index into that table , R_RET(t) returned the class required for the return register and RC_RET used that class as in index and then returned the value it found as a class. So this is saying that the entries in this table are register classes not a list of registers with their classes. I must be missing something obvious cos the existing backends work 😊
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