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.text
.globl factorial
.type factorial, @function
factorial:
// If input <= 1, just return the given thing.
addi t0, zero, 1
bgt a0, t0, else
jr ra
else:
// Preserve the argument and the return address before the call.
addi sp, sp, -16
sd a0, 0(sp)
sd ra, 8(sp)
// Call the same function but with a value of argument-1.
addi a0, a0, -1
call factorial
// Restore back the original argument and the return address. Then multiply
// the original argument with the returned one from the previous call.
ld t1, 0(sp)
ld ra, 8(sp)
addi sp, sp, 16
mul a0, t1, a0
// And return to the caller.
jr ra
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