// Bootstrap code
@256
D = A
@SP
M = D
// ^ SP = 256

// call Sys.init 0
@Sys.init:return:0
D = A
@SP
A = M
M = D
@SP
M = M + 1
// ^ push return-address
@LCL
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push lcl
@ARG
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push arg
@THIS
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push this
@THAT
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push that
@SP
D = M
@0
D = D - A
@5
D = D - A
@ARG
M = D
// ^ ARG = SP - 0 - 5
@SP
D = M
@LCL
M = D
// ^ LCL = SP
@Sys.init
0;JMP
// ^ goto Sys.init
(Sys.init:return:0)


// Start /home/felixm/dev/nand2tetris/projects/08/FunctionCalls/FibonacciElement/Sys.vm

// function Sys.init 0
(Sys.init)
@0
D = A
// ^ push 0 * 0

// push constant 4
@4
D = A
@SP
A = M
M = D
@SP
M = M + 1

// call Main.fibonacci 1
@Main.fibonacci:return:1
D = A
@SP
A = M
M = D
@SP
M = M + 1
// ^ push return-address
@LCL
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push lcl
@ARG
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push arg
@THIS
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push this
@THAT
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push that
@SP
D = M
@1
D = D - A
@5
D = D - A
@ARG
M = D
// ^ ARG = SP - 1 - 5
@SP
D = M
@LCL
M = D
// ^ LCL = SP
@Main.fibonacci
0;JMP
// ^ goto Main.fibonacci
(Main.fibonacci:return:1)


// label Sys.init:WHILE
(Sys.init:WHILE)

// goto Sys.init:WHILE
@Sys.init:WHILE
0;JMP

// Start /home/felixm/dev/nand2tetris/projects/08/FunctionCalls/FibonacciElement/Main.vm

// function Main.fibonacci 0
(Main.fibonacci)
@0
D = A
// ^ push 0 * 0

// push argument 0
@0
D = A
@ARG
A = M
A = D + A
D = M
// ^ D = *(ARG + index)
@SP
A = M
M = D
@SP
M = M + 1
// ^ push D

// push constant 2
@2
D = A
@SP
A = M
M = D
@SP
M = M + 1

// lt
@SP
A = M
A = A - 1
A = A - 1
D = M
A = A + 1
D = D - M
@IF_JLT_1
D;JLT
@ELSE_JLT_1
0;JMP
(IF_JLT_1)
D = -1
@END_JLT_1
0;JMP
(ELSE_JLT_1)
D = 0
(END_JLT_1)
@SP
A = M
A = A - 1
A = A - 1
M = D
@SP
M = M - 1

// if-goto Main.fibonacci:IF_TRUE
@SP
A = M
A = A - 1
D = M
@SP
M = M - 1
@Main.fibonacci:IF_TRUE
D;JNE
// goto Main.fibonacci:IF_FALSE
@Main.fibonacci:IF_FALSE
0;JMP

// label Main.fibonacci:IF_TRUE
(Main.fibonacci:IF_TRUE)

// push argument 0
@0
D = A
@ARG
A = M
A = D + A
D = M
// ^ D = *(ARG + index)
@SP
A = M
M = D
@SP
M = M + 1
// ^ push D

// return
@LCL
D = M
@R13
M = D
// ^ R13 = FRAME = LCL
@5
D = A
@R13
A = M - D
D = M
@R14
M = D
// ^ R14 = RET = *(FRAME - 5)
@SP
A = M
A = A - 1
D = M
@SP
M = M - 1
@ARG
A = M
M = D
// ^ POP into *ARG
@ARG
D = M + 1
@SP
M = D
// ^ SP = ARG + 1
@1
D = A
@R13
A = M - D
D = M
@THAT
M = D
// ^ THAT = *(FRAME - 1)
@2
D = A
@R13
A = M - D
D = M
@THIS
M = D
// ^ THIS = *(FRAME - 2)
@3
D = A
@R13
A = M - D
D = M
@ARG
M = D
// ^ ARG = *(FRAME - 3)
@4
D = A
@R13
A = M - D
D = M
@LCL
M = D
// ^ LCL = *(FRAME - 4)
@R14
A = M
0;JMP
// ^ goto RET


// label Main.fibonacci:IF_FALSE
(Main.fibonacci:IF_FALSE)

// push argument 0
@0
D = A
@ARG
A = M
A = D + A
D = M
// ^ D = *(ARG + index)
@SP
A = M
M = D
@SP
M = M + 1
// ^ push D

// push constant 2
@2
D = A
@SP
A = M
M = D
@SP
M = M + 1

// sub
@SP
A = M
A = A - 1
A = A - 1
D = M
A = A + 1
D = D - M
A = A - 1
M = D
@SP
M = M - 1

// call Main.fibonacci 1
@Main.fibonacci:return:2
D = A
@SP
A = M
M = D
@SP
M = M + 1
// ^ push return-address
@LCL
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push lcl
@ARG
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push arg
@THIS
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push this
@THAT
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push that
@SP
D = M
@1
D = D - A
@5
D = D - A
@ARG
M = D
// ^ ARG = SP - 1 - 5
@SP
D = M
@LCL
M = D
// ^ LCL = SP
@Main.fibonacci
0;JMP
// ^ goto Main.fibonacci
(Main.fibonacci:return:2)


// push argument 0
@0
D = A
@ARG
A = M
A = D + A
D = M
// ^ D = *(ARG + index)
@SP
A = M
M = D
@SP
M = M + 1
// ^ push D

// push constant 1
@1
D = A
@SP
A = M
M = D
@SP
M = M + 1

// sub
@SP
A = M
A = A - 1
A = A - 1
D = M
A = A + 1
D = D - M
A = A - 1
M = D
@SP
M = M - 1

// call Main.fibonacci 1
@Main.fibonacci:return:3
D = A
@SP
A = M
M = D
@SP
M = M + 1
// ^ push return-address
@LCL
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push lcl
@ARG
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push arg
@THIS
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push this
@THAT
D = M
@SP
A = M
M = D
@SP
M = M + 1
// ^ push that
@SP
D = M
@1
D = D - A
@5
D = D - A
@ARG
M = D
// ^ ARG = SP - 1 - 5
@SP
D = M
@LCL
M = D
// ^ LCL = SP
@Main.fibonacci
0;JMP
// ^ goto Main.fibonacci
(Main.fibonacci:return:3)


// add
@SP
A = M
A = A - 1
A = A - 1
D = M
A = A + 1
D = D + M
A = A - 1
M = D
@SP
M = M - 1

// return
@LCL
D = M
@R13
M = D
// ^ R13 = FRAME = LCL
@5
D = A
@R13
A = M - D
D = M
@R14
M = D
// ^ R14 = RET = *(FRAME - 5)
@SP
A = M
A = A - 1
D = M
@SP
M = M - 1
@ARG
A = M
M = D
// ^ POP into *ARG
@ARG
D = M + 1
@SP
M = D
// ^ SP = ARG + 1
@1
D = A
@R13
A = M - D
D = M
@THAT
M = D
// ^ THAT = *(FRAME - 1)
@2
D = A
@R13
A = M - D
D = M
@THIS
M = D
// ^ THIS = *(FRAME - 2)
@3
D = A
@R13
A = M - D
D = M
@ARG
M = D
// ^ ARG = *(FRAME - 3)
@4
D = A
@R13
A = M - D
D = M
@LCL
M = D
// ^ LCL = *(FRAME - 4)
@R14
A = M
0;JMP
// ^ goto RET