351 lines
2.8 KiB
NASM
351 lines
2.8 KiB
NASM
// push argument 1
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@1
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D = A
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@ARG
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A = M
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A = D + A
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D = M
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// ^ D = *(LCL + index)
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push D
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// pop pointer THAT
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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@THAT
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M = D
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// ^ pop into THAT
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// push constant 0
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@0
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D = A
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// pop that 0
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@0
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D = A
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@THAT
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A = M
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D = D + A
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@R13
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M = D
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// ^ R13 = that + index
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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// ^ pop into D
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@R13
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A = M
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M = D
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// ^ *R13 = D
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// push constant 1
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@1
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D = A
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// pop that 1
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@1
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D = A
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@THAT
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A = M
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D = D + A
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@R13
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M = D
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// ^ R13 = that + index
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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// ^ pop into D
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@R13
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A = M
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M = D
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// ^ *R13 = D
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// push argument 0
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@0
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D = A
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@ARG
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A = M
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A = D + A
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D = M
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// ^ D = *(LCL + index)
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push D
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// push constant 2
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@2
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D = A
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// sub
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@SP
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A = M
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A = A - 1
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A = A - 1
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D = M
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A = A + 1
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D = D - M
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A = A - 1
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M = D
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@SP
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M = M - 1
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// pop argument 0
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@0
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D = A
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@ARG
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A = M
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D = D + A
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@R13
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M = D
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// ^ R13 = argument + index
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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// ^ pop into D
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@R13
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A = M
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M = D
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// ^ *R13 = D
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// label MAIN_LOOP_START
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(MAIN_LOOP_START)
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// push argument 0
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@0
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D = A
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@ARG
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A = M
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A = D + A
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D = M
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// ^ D = *(LCL + index)
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push D
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// if-goto COMPUTE_ELEMENT
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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@COMPUTE_ELEMENT
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D;JNE
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// goto END_PROGRAM
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@END_PROGRAM
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0;JMP
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// label COMPUTE_ELEMENT
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(COMPUTE_ELEMENT)
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// push that 0
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@0
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D = A
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@THAT
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A = M
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A = D + A
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D = M
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// ^ D = *(LCL + index)
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push D
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// push that 1
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@1
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D = A
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@THAT
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A = M
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A = D + A
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D = M
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// ^ D = *(LCL + index)
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push D
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// add
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@SP
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A = M
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A = A - 1
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A = A - 1
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D = M
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A = A + 1
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D = D + M
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A = A - 1
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M = D
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@SP
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M = M - 1
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// pop that 2
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@2
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D = A
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@THAT
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A = M
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D = D + A
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@R13
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M = D
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// ^ R13 = that + index
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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// ^ pop into D
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@R13
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A = M
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M = D
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// ^ *R13 = D
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// push pointer THAT
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@THAT
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D = M
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push THAT
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// push constant 1
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@1
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D = A
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// add
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@SP
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A = M
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A = A - 1
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A = A - 1
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D = M
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A = A + 1
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D = D + M
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A = A - 1
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M = D
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@SP
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M = M - 1
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// pop pointer THAT
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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@THAT
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M = D
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// ^ pop into THAT
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// push argument 0
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@0
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D = A
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@ARG
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A = M
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A = D + A
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D = M
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// ^ D = *(LCL + index)
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// ^ push D
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// push constant 1
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@1
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D = A
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@SP
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A = M
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M = D
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@SP
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M = M + 1
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// sub
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@SP
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A = M
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A = A - 1
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A = A - 1
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D = M
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A = A + 1
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D = D - M
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A = A - 1
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M = D
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@SP
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M = M - 1
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// pop argument 0
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@0
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D = A
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@ARG
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A = M
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D = D + A
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@R13
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M = D
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// ^ R13 = argument + index
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@SP
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A = M
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A = A - 1
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D = M
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@SP
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M = M - 1
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// ^ pop into D
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@R13
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A = M
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M = D
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// ^ *R13 = D
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// goto MAIN_LOOP_START
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@MAIN_LOOP_START
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0;JMP
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// label END_PROGRAM
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(END_PROGRAM)
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