36 lines
1.2 KiB
Plaintext
36 lines
1.2 KiB
Plaintext
program Multiply-function
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// Input: x, y, and z
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// Output: x * y * z
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// Remarks: Inefficient for large or negative values of x or y
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// -----------------------------------------------------------------------------
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10: 82FF read R[2] x
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11: 83FF read R[3] y
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12: 84FF read R[4] z
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// Multiply x and y
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13: 1A20 R[A] <- R[2] x
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14: 1B30 R[B] <- R[3] y
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15: FF30 R[F] <- pc; goto 30 x * y
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// Multiply (x * y) and z
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16: 1AC0 R[A] <- R[C] x * y
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17: 1B40 R[B] <- R[4] z
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18: FF30 R[F] <- pc; goto 30 (x * y) * z
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19: 9CFF write R[C]
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1A: 0000 halt
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function multiply
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// Input: R[A] and R[B] (should be passed by value)
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// Return address: R[F]
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// Output: R[C] = R[A] * R[B]
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// Temporary variables: R[1] = 1
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30: 7C00 R[C] <- 0000
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31: 7101 R[1] <- 0001
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32: CA36 if (R[A] == 0) goto 36
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33: 1CCB R[C] <- R[C] + R[B]
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34: 2AA1 R[A] <- R[A] - R[1]
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35: C032 goto 32
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36: EF00 goto R[F]
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