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qbe/test/call-factorial.ssa

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function w $factorial (w %n, w %acc) {
@start
jnz %n, @nz, @z
@z
ret %acc
@nz
%n_next =w sub %n, 1
%acc_next =w mul %n, %acc
%r =w call $factorial (w %n_next, w %acc)
ret %r
}