| 1 | /**************************************** |
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| 2 | * Computer Algebra System SINGULAR * |
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| 3 | ****************************************/ |
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| 4 | /*************************************************************** |
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| 5 | * File: p_Add_q__Template.cc |
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| 6 | * Purpose: template for p_Add_q |
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| 7 | * Author: obachman (Olaf Bachmann) |
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| 8 | * Created: 8/00 |
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| 9 | *******************************************************************/ |
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| 10 | |
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| 11 | /*************************************************************** |
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| 12 | * |
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| 13 | * Returns: p + q, |
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| 14 | * Shorter, where Shorter == Length(p) + Length(q) - Length(p+q); |
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| 15 | * Destroys: p, q |
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| 16 | * |
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| 17 | ***************************************************************/ |
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| 18 | LINKAGE poly p_Add_q__T(poly p, poly q, int &Shorter, const ring r) |
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| 19 | { |
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| 20 | p_Test(p, r); |
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| 21 | p_Test(q, r); |
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| 22 | #if PDEBUG > 0 |
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| 23 | int l = pLength(p) + pLength(q); |
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| 24 | #endif |
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| 25 | assume(p!=NULL && q!=NULL); |
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| 26 | |
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| 27 | Shorter = 0; |
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| 28 | |
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| 29 | number t, n1, n2; |
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| 30 | int shorter = 0; |
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| 31 | spolyrec rp; |
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| 32 | poly a = &rp; |
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| 33 | DECLARE_LENGTH(const unsigned long length = r->CmpL_Size); |
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| 34 | DECLARE_ORDSGN(const long* ordsgn = r->ordsgn); |
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| 35 | |
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| 36 | Top: // compare p and q w.r.t. monomial ordering |
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| 37 | p_MemCmp__T(p->exp, q->exp, length, ordsgn, goto Equal, goto Greater , goto Smaller); |
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| 38 | |
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| 39 | Equal: |
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| 40 | n1 = pGetCoeff(p); |
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| 41 | n2 = pGetCoeff(q); |
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| 42 | n_InpAdd__T(n1,n2,r->cf); |
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| 43 | t = n1; |
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| 44 | n_Delete__T(&n2, r->cf); |
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| 45 | q = p_LmFreeAndNext(q, r); |
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| 46 | |
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| 47 | if (n_IsZero__T(t, r->cf)) |
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| 48 | { |
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| 49 | shorter += 2; |
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| 50 | n_Delete__T(&t, r->cf); |
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| 51 | p = p_LmFreeAndNext(p, r); |
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| 52 | } |
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| 53 | else |
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| 54 | { |
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| 55 | shorter++; |
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| 56 | pSetCoeff0(p,t); |
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| 57 | a = pNext(a) = p; |
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| 58 | pIter(p); |
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| 59 | } |
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| 60 | if (p==NULL) { pNext(a) = q; goto Finish;} |
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| 61 | if (q==NULL) { pNext(a) = p; goto Finish;} |
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| 62 | goto Top; |
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| 63 | |
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| 64 | Greater: |
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| 65 | a = pNext(a) = p; |
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| 66 | pIter(p); |
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| 67 | if (p==NULL) { pNext(a) = q; goto Finish;} |
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| 68 | goto Top; |
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| 69 | |
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| 70 | Smaller: |
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| 71 | a = pNext(a) = q; |
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| 72 | pIter(q); |
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| 73 | if (q==NULL) { pNext(a) = p; goto Finish;} |
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| 74 | goto Top; |
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| 75 | |
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| 76 | |
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| 77 | Finish: |
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| 78 | Shorter = shorter; |
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| 79 | |
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| 80 | p_Test(pNext(&rp), r); |
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| 81 | #if PDEBUG > 0 |
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| 82 | pAssume1(l - pLength(pNext(&rp)) == Shorter); |
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| 83 | #endif |
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| 84 | return pNext(&rp); |
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| 85 | } |
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| 86 | |
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