Hi all,
I’m trying to understand how to properly call an unknown function from
low-level Cmm code. If I’m just applying a function to a state token, it’s
easy; I can just do
R1 = io;
jump stg_ap_v_fast [R1];
since the calling convention is consistent in that case. But what if my
function takes actual arguments? I can’t do
R1 = fun;
R2 = arg;
jump stg_ap_p_fast [R1, R2];
because if the calling convention doesn’t pass any arguments in registers, that
would be wrong. I could check if NO_ARG_REGS is defined and generate different
code in that situation, but that seems extreme. One option I think would work
would be to do
R1 = fun;
Sp_adj(-2);
Sp(1) = arg;
jump RET_LBL(stg_ap_p) [R1];
but that seems wasteful if I have the argument in a register already anyway. Am
I missing something?
Thanks,
Alexis
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