File: factorial.toy

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gcc-riscv64-unknown-elf 8.3.0.2019.08%2Bdfsg-1
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# Simple recursive factorial implementation, roughly equivalent to:
#
#  int factorial (int arg)
#  {
#     if (arg < 2)
#       return arg
#     return arg * factorial (arg - 1)
#  }

# Initial state:
# stack: [arg]

# 0:
DUP
# stack: [arg, arg]

# 1:
PUSH_CONST 2
# stack: [arg, arg, 2]

# 2:
BINARY_COMPARE_LT
# stack: [arg, (arg < 2)]

# 3:
JUMP_ABS_IF_TRUE 9
# stack: [arg]

# 4:
DUP
# stack: [arg, arg]

# 5:
PUSH_CONST 1
# stack: [arg, arg, 1]

# 6:
BINARY_SUBTRACT
# stack: [arg,  (arg - 1)

# 7:
RECURSE
# stack: [arg, factorial(arg - 1)]

# 8:
BINARY_MULT
# stack: [arg * factorial(arg - 1)]

# 9:
RETURN