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Include hack to unify two attributed variables, if the solver knows what

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it is doing.
This commit is contained in:
Vitor Santos Costa 2008-11-14 14:50:54 +00:00
parent 8e9fde1c6c
commit 7a21ccb009
1 changed files with 24 additions and 0 deletions
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24
C/attvar.c
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@ -922,6 +922,29 @@ p_free_term(void)
return Yap_unify(ARG1,TermFreeTerm);
}
static Int
p_fast_unify(void)
{
/*
Case we want to unify two variables, but we do not
think there is a point in waking them up
*/
Term t1, t2;
CELL *a, *b;
if (!IsVarTerm(t1 = Deref(ARG1)))
return FALSE;
if (!IsVarTerm(t2 = Deref(ARG2)))
return FALSE;
a = VarOfTerm(t1);
b = VarOfTerm(t2);
if(a > b) {
Bind_Global(a,t2);
} else if((a) < (b)){
Bind_Global(b,t1);
}
return TRUE;
}
#else
static Int
@ -969,6 +992,7 @@ void Yap_InitAttVarPreds(void)
Yap_InitCPred("modules_with_attributes", 2, p_modules_with_atts, SafePredFlag);
Yap_InitCPred("void_term", 1, p_void_term, SafePredFlag);
Yap_InitCPred("free_term", 1, p_free_term, SafePredFlag);
Yap_InitCPred("fast_unify_attributed", 2, p_fast_unify, 0);
#endif /* COROUTINING */
Yap_InitCPred("all_attvars", 1, p_all_attvars, 0);
CurrentModule = OldCurrentModule;