The first line is the entry point of the function at address
#x41AEAF8. This is followed by the standard function prologue that
sets up the Lisp stack frame and loads the single 32-bit argument
(either a fixnum or a heap-allocated bignum) into the register
%NL2. (Note that the register names do not follow the standard
sparc names; the register names denote the specific type of register.
In this case %NL<n> means non-descriptor register <n>).
At label L1, the heart of the routine starts. The next three
instructions implement the logior, logxor and logand
functions. Afterwards, the code is allocating space in case the
result is a bignum. As in the x86 version, care is taken to make sure
the allocation is done pseudo-atomically.
Finally, at label L2, we have the standard function epilogue
that destroys our stack frame and returns to the caller.