| 1 | # Multiply rational numbers
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| 2 | #
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| 3 | # Input: tos-2 multiplicand
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| 4 | #
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| 5 | # tos-1 multiplier
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| 6 | #
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| 7 | # Output: product on stack
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| 8 |
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| 9 |
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| 10 |
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| 11 | qmul = ->
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| 12 | save()
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| 13 |
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| 14 | p2 = pop()
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| 15 | p1 = pop()
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| 16 |
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| 17 | # zero?
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| 18 |
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| 19 | if (MZERO(p1.q.a) || MZERO(p2.q.a))
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| 20 | push(zero)
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| 21 | restore()
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| 22 | return
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| 23 |
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| 24 | aa = mmul(p1.q.a, p2.q.a)
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| 25 | bb = mmul(p1.q.b, p2.q.b)
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| 26 |
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| 27 | c = mgcd(aa, bb)
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| 28 |
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| 29 | c = makeSignSameAs(c,bb)
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| 30 |
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| 31 | p1 = new U()
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| 32 |
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| 33 | p1.k = NUM
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| 34 |
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| 35 | p1.q.a = mdiv(aa, c)
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| 36 | p1.q.b = mdiv(bb, c)
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| 37 |
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| 38 | #mfree(aa)
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| 39 | #mfree(bb)
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| 40 |
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| 41 | push(p1)
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| 42 |
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| 43 | restore()
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