855 lines
21 KiB
C
855 lines
21 KiB
C
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/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: cmppreds.c *
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* Last rev: *
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* mods: *
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* comments: comparing two prolog terms *
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* *
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*************************************************************************/
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/**
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* @file cmppreds.c
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* @author VITOR SANTOS COSTA <vsc@VITORs-MBP-2.lan>
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* @date Mon Apr 30 09:35:58 2018
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*
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* @brief comparison
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*
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* @namespace prolog
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*
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*
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*
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*/
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/// @file cmppreds.c
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/**
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@defgroup Comparing_Terms Comparing Terms
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@ingroup builtins
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The following predicates are used to compare and order terms, using the
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standard ordering:
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+
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variables come before numbers, numbers come before atoms which in turn
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come before compound terms, i.e.: variables @< numbers @< atoms @<
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compound terms.
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+ Variables are roughly ordered by "age" (the "oldest" variable is put
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first);
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+
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Floating point numbers are sorted in increasing order;
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+
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Rational numbers are sorted in increasing order;
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+
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Integers are sorted in increasing order;
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+
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Atoms are sorted in lexicographic order;
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+
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Compound terms are ordered first by arity of the main functor, then by
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the name of the main functor, and finally by their arguments in
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left-to-right order.
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@{
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*/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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#include "Yap.h"
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#include "YapHeap.h"
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#include "Yatom.h"
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#include "YapEval.h"
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#include <wchar.h>
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#include "YapError.h"
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static Int compare(Term, Term);
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static Int p_compare(USES_REGS1);
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static Int p_acomp(USES_REGS1);
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static Int a_eq(Term, Term);
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static Int a_dif(Term, Term);
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static Int a_gt(Term, Term);
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static Int a_ge(Term, Term);
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static Int a_lt(Term, Term);
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static Int a_le(Term, Term);
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static Int a_noteq(Term, Term);
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static Int a_gen_lt(Term, Term);
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static Int a_gen_le(Term, Term);
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static Int a_gen_gt(Term, Term);
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static Int a_gen_ge(Term, Term);
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#define rfloat(X) (X > 0.0 ? 1 : (X == 0.0 ? 0 : -1))
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static int cmp_atoms(Atom a1, Atom a2) {
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return strcmp(RepAtom(a1)->StrOfAE, RepAtom(a2)->StrOfAE);
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}
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static Int compare_complex(register CELL *pt0, register CELL *pt0_end,
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register CELL *pt1) {
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CACHE_REGS
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register CELL **to_visit = (CELL **)HR;
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register Int out = 0;
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loop:
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while (pt0 < pt0_end) {
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register CELL d0, d1;
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++pt0;
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++pt1;
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d0 = Derefa(pt0);
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d1 = Derefa(pt1);
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if (IsVarTerm(d0)) {
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if (IsVarTerm(d1)) {
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out = Signed(d0) - Signed(d1);
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if (out)
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goto done;
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} else {
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out = -1;
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goto done;
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}
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} else if (IsVarTerm(d1)) {
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out = 1;
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goto done;
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} else {
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if (d0 == d1)
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continue;
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else if (IsAtomTerm(d0)) {
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if (IsAtomTerm(d1))
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out = cmp_atoms(AtomOfTerm(d0), AtomOfTerm(d1));
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else if (IsPrimitiveTerm(d1))
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out = 1;
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else
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out = -1;
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/* I know out must be != 0 */
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goto done;
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} else if (IsIntTerm(d0)) {
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if (IsIntTerm(d1))
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out = IntOfTerm(d0) - IntOfTerm(d1);
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else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = IntOfTerm(d0) - LongIntOfTerm(d1);
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#ifdef USE_GMP
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} else if (IsBigIntTerm(d1)) {
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out = Yap_gmp_tcmp_int_big(IntOfTerm(d0), d1);
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#endif
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} else if (IsRefTerm(d1))
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out = 1;
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else
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out = -1;
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if (out != 0)
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goto done;
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} else if (IsFloatTerm(d0)) {
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if (IsFloatTerm(d1)) {
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out = rfloat(FloatOfTerm(d0) - FloatOfTerm(d1));
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} else if (IsRefTerm(d1)) {
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out = 1;
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} else {
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out = -1;
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}
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if (out != 0)
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goto done;
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} else if (IsStringTerm(d0)) {
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if (IsStringTerm(d1)) {
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out = strcmp((char *)StringOfTerm(d0), (char *)StringOfTerm(d1));
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} else if (IsIntTerm(d1))
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out = 1;
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else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = 1;
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#ifdef USE_GMP
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} else if (IsBigIntTerm(d1)) {
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out = 1;
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#endif
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} else if (IsRefTerm(d1)) {
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out = 1;
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} else {
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out = -1;
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}
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if (out != 0)
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goto done;
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} else if (IsLongIntTerm(d0)) {
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if (IsIntTerm(d1))
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out = LongIntOfTerm(d0) - IntOfTerm(d1);
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else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = LongIntOfTerm(d0) - LongIntOfTerm(d1);
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#ifdef USE_GMP
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} else if (IsBigIntTerm(d1)) {
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out = Yap_gmp_tcmp_int_big(LongIntOfTerm(d0), d1);
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#endif
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} else if (IsRefTerm(d1)) {
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out = 1;
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} else {
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out = -1;
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}
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if (out != 0)
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goto done;
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}
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#ifdef USE_GMP
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else if (IsBigIntTerm(d0)) {
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if (IsIntTerm(d1)) {
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out = Yap_gmp_tcmp_big_int(d0, IntOfTerm(d1));
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} else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = Yap_gmp_tcmp_big_int(d0, LongIntOfTerm(d1));
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} else if (IsBigIntTerm(d1)) {
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out = Yap_gmp_tcmp_big_big(d0, d1);
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} else if (IsRefTerm(d1))
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out = 1;
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else
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out = -1;
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if (out != 0)
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goto done;
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}
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#endif
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else if (IsPairTerm(d0)) {
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if (!IsPairTerm(d1)) {
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if (IsApplTerm(d1)) {
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Functor f = FunctorOfTerm(d1);
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if (IsExtensionFunctor(f))
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out = 1;
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else if (!(out = 2 - ArityOfFunctor(f)))
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out = strcmp(".", (char *)RepAtom(NameOfFunctor(f))->StrOfAE);
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} else
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out = 1;
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goto done;
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}
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#ifdef RATIONAL_TREES
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit[3] = (CELL *)*pt0;
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to_visit += 4;
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*pt0 = d1;
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#else
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/* store the terms to visit */
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if (pt0 < pt0_end) {
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit += 3;
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}
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#endif
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pt0 = RepPair(d0) - 1;
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pt0_end = RepPair(d0) + 1;
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pt1 = RepPair(d1) - 1;
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continue;
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} else if (IsRefTerm(d0)) {
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if (IsRefTerm(d1))
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out = Unsigned(RefOfTerm(d1)) - Unsigned(RefOfTerm(d0));
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else
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out = -1;
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goto done;
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} else if (IsApplTerm(d0)) {
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register Functor f;
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register CELL *ap2, *ap3;
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if (!IsApplTerm(d1)) {
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out = 1;
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goto done;
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} else {
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/* store the terms to visit */
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Functor f2;
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ap2 = RepAppl(d0);
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ap3 = RepAppl(d1);
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f = (Functor)(*ap2);
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if (IsExtensionFunctor(f)) {
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out = 1;
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goto done;
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}
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f2 = (Functor)(*ap3);
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if (IsExtensionFunctor(f2)) {
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out = -1;
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goto done;
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}
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/* compare functors */
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if (f != (Functor)*ap3) {
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if (!(out = ArityOfFunctor(f) - ArityOfFunctor(f2)))
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out = cmp_atoms(NameOfFunctor(f), NameOfFunctor(f2));
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goto done;
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}
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#ifdef RATIONAL_TREES
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit[3] = (CELL *)*pt0;
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to_visit += 4;
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*pt0 = d1;
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#else
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/* store the terms to visit */
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if (pt0 < pt0_end) {
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit += 3;
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}
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#endif
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d0 = ArityOfFunctor(f);
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pt0 = ap2;
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pt0_end = ap2 + d0;
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pt1 = ap3;
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continue;
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}
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}
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}
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}
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/* Do we still have compound terms to visit */
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if (to_visit > (CELL **)HR) {
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#ifdef RATIONAL_TREES
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to_visit -= 4;
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pt0 = to_visit[0];
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pt0_end = to_visit[1];
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pt1 = to_visit[2];
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*pt0 = (CELL)to_visit[3];
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#else
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to_visit -= 3;
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pt0 = to_visit[0];
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pt0_end = to_visit[1];
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pt1 = to_visit[2];
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#endif
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goto loop;
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}
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done:
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/* failure */
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#ifdef RATIONAL_TREES
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while (to_visit > (CELL **)HR) {
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to_visit -= 4;
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pt0 = to_visit[0];
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pt0_end = to_visit[1];
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pt1 = to_visit[2];
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*pt0 = (CELL)to_visit[3];
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}
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#endif
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return (out);
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}
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inline static Int compare(Term t1, Term t2) /* compare terms t1 and t2 */
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{
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if (t1 == t2)
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return 0;
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if (IsVarTerm(t1)) {
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if (IsVarTerm(t2))
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return Signed(t1) - Signed(t2);
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return -1;
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} else if (IsVarTerm(t2)) {
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/* get rid of variables */
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return 1;
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}
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if (IsAtomOrIntTerm(t1)) {
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if (IsAtomTerm(t1)) {
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if (IsAtomTerm(t2))
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return cmp_atoms(AtomOfTerm(t1), AtomOfTerm(t2));
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if (IsPrimitiveTerm(t2))
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return 1;
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if (IsStringTerm(t2))
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return 1;
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return -1;
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} else {
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if (IsIntTerm(t2)) {
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return IntOfTerm(t1) - IntOfTerm(t2);
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}
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if (IsApplTerm(t2)) {
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Functor fun2 = FunctorOfTerm(t2);
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switch ((CELL)fun2) {
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case double_e:
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return 1;
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case long_int_e:
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return IntOfTerm(t1) - LongIntOfTerm(t2);
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#ifdef USE_GMP
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case big_int_e:
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return Yap_gmp_tcmp_int_big(IntOfTerm(t1), t2);
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#endif
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case db_ref_e:
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return 1;
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case string_e:
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return -1;
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}
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}
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return -1;
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}
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} else if (IsPairTerm(t1)) {
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if (IsApplTerm(t2)) {
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Functor f = FunctorOfTerm(t2);
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if (IsExtensionFunctor(f))
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return 1;
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else {
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if (f != FunctorDot)
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return strcmp(".", RepAtom(NameOfFunctor(f))->StrOfAE);
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else {
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return compare_complex(RepPair(t1) - 1, RepPair(t1) + 1, RepAppl(t2));
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}
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}
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}
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if (IsPairTerm(t2)) {
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return (
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compare_complex(RepPair(t1) - 1, RepPair(t1) + 1, RepPair(t2) - 1));
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} else
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return 1;
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} else {
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/* compound term */
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Functor fun1 = FunctorOfTerm(t1);
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if (IsExtensionFunctor(fun1)) {
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/* float, long, big, dbref */
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switch ((CELL)fun1) {
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case double_e: {
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if (IsFloatTerm(t2))
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return (rfloat(FloatOfTerm(t1) - FloatOfTerm(t2)));
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if (IsRefTerm(t2))
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return 1;
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return -1;
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}
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case long_int_e: {
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if (IsIntTerm(t2))
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return LongIntOfTerm(t1) - IntOfTerm(t2);
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if (IsFloatTerm(t2)) {
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return 1;
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}
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if (IsLongIntTerm(t2))
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return LongIntOfTerm(t1) - LongIntOfTerm(t2);
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#ifdef USE_GMP
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if (IsBigIntTerm(t2)) {
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return Yap_gmp_tcmp_int_big(LongIntOfTerm(t1), t2);
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}
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#endif
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if (IsRefTerm(t2))
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return 1;
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return -1;
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}
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#ifdef USE_GMP
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case big_int_e: {
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if (IsIntTerm(t2))
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return Yap_gmp_tcmp_big_int(t1, IntOfTerm(t2));
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if (IsFloatTerm(t2)) {
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return 1;
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}
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if (IsLongIntTerm(t2))
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return Yap_gmp_tcmp_big_int(t1, LongIntOfTerm(t2));
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if (IsBigIntTerm(t2)) {
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return Yap_gmp_tcmp_big_big(t1, t2);
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}
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if (IsRefTerm(t2))
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return 1;
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return -1;
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}
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#endif
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case string_e: {
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if (IsApplTerm(t2)) {
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Functor fun2 = FunctorOfTerm(t2);
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switch ((CELL)fun2) {
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case double_e:
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return 1;
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case long_int_e:
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return 1;
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#ifdef USE_GMP
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case big_int_e:
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return 1;
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#endif
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case db_ref_e:
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return 1;
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case string_e:
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return strcmp((char *)StringOfTerm(t1), (char *)StringOfTerm(t2));
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}
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return -1;
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}
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return -1;
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}
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case db_ref_e:
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if (IsRefTerm(t2))
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return Unsigned(RefOfTerm(t2)) - Unsigned(RefOfTerm(t1));
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return -1;
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}
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}
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if (!IsApplTerm(t2)) {
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if (IsPairTerm(t2)) {
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Int out;
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Functor f = FunctorOfTerm(t1);
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if (!(out = ArityOfFunctor(f)) - 2)
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out = strcmp((char *)RepAtom(NameOfFunctor(f))->StrOfAE, ".");
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return out;
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}
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return 1;
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} else {
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Functor fun2 = FunctorOfTerm(t2);
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Int r;
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if (IsExtensionFunctor(fun2)) {
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return 1;
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}
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r = ArityOfFunctor(fun1) - ArityOfFunctor(fun2);
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if (r)
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return r;
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r = cmp_atoms(NameOfFunctor(fun1), NameOfFunctor(fun2));
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if (r)
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return r;
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else
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return (compare_complex(RepAppl(t1), RepAppl(t1) + ArityOfFunctor(fun1),
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RepAppl(t2)));
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}
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}
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}
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Int Yap_compare_terms(Term d0, Term d1) {
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return compare(Deref(d0), Deref(d1));
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}
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/** @pred compare( _C_, _X_, _Y_) is iso
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As a result of comparing _X_ and _Y_, _C_ may take one of
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the following values:
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+
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`=` if _X_ and _Y_ are identical;
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+
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`<` if _X_ precedes _Y_ in the defined order;
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+
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`>` if _Y_ precedes _X_ in the defined order;
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*/
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Int p_compare(USES_REGS1) { /* compare(?Op,?T1,?T2) */
|
|
Int r = compare(Deref(ARG2), Deref(ARG3));
|
|
Atom p;
|
|
Term t = Deref(ARG1);
|
|
if (r < 0)
|
|
p = AtomLT;
|
|
else if (r > 0)
|
|
p = AtomGT;
|
|
else
|
|
p = AtomEQ;
|
|
if (!IsVarTerm(t)) {
|
|
if (IsAtomTerm(t)) {
|
|
Atom a = AtomOfTerm(t);
|
|
if (a == p)
|
|
return true;
|
|
if (a != AtomLT && a != AtomGT && a != AtomEq)
|
|
Yap_Error(DOMAIN_ERROR_ORDER, ARG1, NULL);
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_ATOM, ARG1, NULL);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
return Yap_unify_constant(ARG1, MkAtomTerm(p));
|
|
}
|
|
|
|
/** @pred X \== Y is iso
|
|
|
|
Terms _X_ and _Y_ are not strictly identical.
|
|
*/
|
|
static Int a_noteq(Term t1, Term t2) { return (compare(t1, t2) != 0); }
|
|
|
|
static Int a_gen_lt(Term t1, Term t2) { return (compare(t1, t2) < 0); }
|
|
|
|
/** @pred X @=< Y is iso
|
|
|
|
|
|
Term _X_ does not follow term _Y_ in the standard order.
|
|
|
|
*/
|
|
static Int a_gen_le(Term t1, Term t2) { return (compare(t1, t2) <= 0); }
|
|
|
|
/** @pred X @> Y is iso
|
|
|
|
|
|
Term _X_ does not follow term _Y_ in the standard order
|
|
*/
|
|
static Int a_gen_gt(Term t1, Term t2) { return compare(t1, t2) > 0; }
|
|
|
|
/** @pred X @>= Y is iso
|
|
|
|
Term _X_ does not precede term _Y_ in the standard order.
|
|
*/
|
|
static Int a_gen_ge(Term t1, Term t2) { return compare(t1, t2) >= 0; }
|
|
|
|
/**
|
|
@}
|
|
*/
|
|
|
|
/**
|
|
|
|
@defgroup arithmetic_cmps Arithmetic Comparison Predicates
|
|
@ingroup arithmetic
|
|
|
|
Comparison of Numeric Expressions. Both arguments must be valid ground
|
|
expressions at time of call.
|
|
|
|
@{
|
|
*/
|
|
inline static Int int_cmp(Int dif) { return dif; }
|
|
|
|
inline static Int flt_cmp(Float dif) {
|
|
if (dif < 0.0)
|
|
return -1;
|
|
if (dif > 0.0)
|
|
return 1;
|
|
return dif = 0.0;
|
|
}
|
|
|
|
static Int a_cmp(Term t1, Term t2 USES_REGS) {
|
|
if (IsVarTerm(t1)) {
|
|
Yap_ArithError(INSTANTIATION_ERROR, t1,
|
|
"while doing arithmetic comparison");
|
|
}
|
|
if (IsVarTerm(t2)) {
|
|
Yap_ArithError(INSTANTIATION_ERROR, t2,
|
|
"while doing arithmetic comparison");
|
|
}
|
|
if (IsFloatTerm(t1) && IsFloatTerm(t2)) {
|
|
return flt_cmp(FloatOfTerm(t1) - FloatOfTerm(t2));
|
|
}
|
|
if (IsIntegerTerm(t1) && IsIntegerTerm(t2)) {
|
|
return int_cmp(IntegerOfTerm(t1) - IntegerOfTerm(t2));
|
|
}
|
|
t1 = Yap_Eval(t1);
|
|
if (!t1) {
|
|
return FALSE;
|
|
}
|
|
if (IsIntegerTerm(t1)) {
|
|
Int i1 = IntegerOfTerm(t1);
|
|
t2 = Yap_Eval(t2);
|
|
|
|
if (IsIntegerTerm(t2)) {
|
|
Int i2 = IntegerOfTerm(t2);
|
|
return int_cmp(i1 - i2);
|
|
} else if (IsFloatTerm(t2)) {
|
|
Float f2 = FloatOfTerm(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f2)) {
|
|
Yap_ArithError(EVALUATION_ERROR_UNDEFINED, t2,
|
|
"trying to evaluate nan");
|
|
}
|
|
#endif
|
|
return flt_cmp(i1 - f2);
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_cmp_int_big(i1, t2);
|
|
#endif
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
} else if (IsFloatTerm(t1)) {
|
|
Float f1 = FloatOfTerm(t1);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f1)) {
|
|
Yap_ArithError(EVALUATION_ERROR_UNDEFINED, t1,
|
|
"trying to evaluate nan");
|
|
}
|
|
#endif
|
|
t2 = Yap_Eval(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f1))
|
|
return -1;
|
|
#endif
|
|
|
|
if (IsIntegerTerm(t2)) {
|
|
Int i2 = IntegerOfTerm(t2);
|
|
return flt_cmp(f1 - i2);
|
|
} else if (IsFloatTerm(t2)) {
|
|
Float f2 = FloatOfTerm(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f2)) {
|
|
Yap_ArithError(EVALUATION_ERROR_UNDEFINED, t2,
|
|
"trying to evaluate nan");
|
|
}
|
|
#endif
|
|
return flt_cmp(f1 - f2);
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_cmp_float_big(f1, t2);
|
|
#endif
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(t1)) {
|
|
{
|
|
t2 = Yap_Eval(t2);
|
|
|
|
if (IsIntegerTerm(t2)) {
|
|
return Yap_gmp_cmp_big_int(t1, IntegerOfTerm(t2));
|
|
} else if (IsFloatTerm(t2)) {
|
|
Float f2 = FloatOfTerm(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f2)) {
|
|
Yap_ArithError(EVALUATION_ERROR_UNDEFINED, t2,
|
|
"trying to evaluate nan");
|
|
}
|
|
#endif
|
|
return Yap_gmp_cmp_big_float(t1, f2);
|
|
} else if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_cmp_big_big(t1, t2);
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
Int Yap_acmp(Term t1, Term t2 USES_REGS) {
|
|
Int out = a_cmp(t1, t2 PASS_REGS);
|
|
return out;
|
|
}
|
|
|
|
static Int p_acomp(USES_REGS1) { /* $a_compare(?R,+X,+Y) */
|
|
Term t1 = Deref(ARG1);
|
|
Term t2 = Deref(ARG2);
|
|
Int out;
|
|
|
|
out = a_cmp(t1, t2 PASS_REGS);
|
|
return out;
|
|
}
|
|
|
|
/**
|
|
@pred +X '=:=' Y is iso
|
|
Equality of arithmetic expressions
|
|
|
|
The value of the expression _X_ is equal to the value of expression _Y_.
|
|
*/
|
|
|
|
static Int a_eq(Term t1, Term t2) {
|
|
CACHE_REGS
|
|
/* A =:= B */
|
|
Int out;
|
|
t1 = Deref(t1);
|
|
t2 = Deref(t2);
|
|
|
|
if (IsVarTerm(t1)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t1, "=:=/2");
|
|
return (FALSE);
|
|
}
|
|
if (IsVarTerm(t2)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t2, "=:=/2");
|
|
return (FALSE);
|
|
}
|
|
if (IsFloatTerm(t1)) {
|
|
if (IsFloatTerm(t2))
|
|
return (FloatOfTerm(t1) == FloatOfTerm(t2));
|
|
else if (IsIntegerTerm(t2)) {
|
|
return (FloatOfTerm(t1) == IntegerOfTerm(t2));
|
|
}
|
|
}
|
|
if (IsIntegerTerm(t1)) {
|
|
if (IsIntegerTerm(t2)) {
|
|
return (IntegerOfTerm(t1) == IntegerOfTerm(t2));
|
|
} else if (IsFloatTerm(t2)) {
|
|
return (FloatOfTerm(t2) == IntegerOfTerm(t1));
|
|
}
|
|
}
|
|
out = a_cmp(t1, t2 PASS_REGS);
|
|
return out == 0;
|
|
}
|
|
|
|
/*
|
|
@pred +_X_ =\\= _Y_ is iso
|
|
Difference of arithmetic expressions
|
|
|
|
The value of the expression _X_ is different from the value of expression
|
|
_Y_.
|
|
*/
|
|
static Int a_dif(Term t1, Term t2) {
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1), Deref(t2) PASS_REGS);
|
|
return out != 0;
|
|
}
|
|
|
|
/**
|
|
@pred +_X_ \> +_Y_ is iso
|
|
Greater than arithmetic expressions
|
|
|
|
The value of the expression _X_ is less than or equal to the value
|
|
of expression _Y_.
|
|
*/
|
|
static Int a_gt(Term t1, Term t2) { /* A > B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1), Deref(t2) PASS_REGS);
|
|
return out > 0;
|
|
}
|
|
|
|
/**
|
|
@pred +X >= +Y is iso
|
|
Greater than or equal to arithmetic expressions
|
|
|
|
The value of the expression _X_ is greater than or equal to the
|
|
value of expression _Y_.
|
|
*/
|
|
static Int a_ge(Term t1, Term t2) { /* A >= B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1), Deref(t2) PASS_REGS);
|
|
return out >= 0;
|
|
}
|
|
|
|
/**
|
|
@pred +X < +Y is iso
|
|
Lesser than arithmetic expressions
|
|
|
|
The value of the expression _X_ is less than the value of expression
|
|
_Y_.
|
|
*/
|
|
static Int a_lt(Term t1, Term t2) { /* A < B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1), Deref(t2) PASS_REGS);
|
|
return out < 0;
|
|
}
|
|
|
|
/**
|
|
*
|
|
@pred +X =< +Y
|
|
Lesser than or equal to arithmetic expressions
|
|
|
|
|
|
The value of the expression _X_ is less than or equal to the value
|
|
of expression _Y_.
|
|
*/
|
|
static Int a_le(Term t1, Term t2) { /* A <= B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1), Deref(t2) PASS_REGS);
|
|
return out <= 0;
|
|
}
|
|
|
|
/**
|
|
@}
|
|
*/
|
|
|
|
void Yap_InitCmpPreds(void) {
|
|
Yap_InitCmpPred("=:=", 2, a_eq, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred("=\\=", 2, a_dif, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred(">", 2, a_gt, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred("=<", 2, a_le, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred("<", 2, a_lt, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred(">=", 2, a_ge, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCPred("$a_compare", 3, p_acomp, TestPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("\\==", 2, a_noteq, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@<", 2, a_gen_lt, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@=<", 2, a_gen_le, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@>", 2, a_gen_gt, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@>=", 2, a_gen_ge, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCPred("compare", 3, p_compare, TestPredFlag | SafePredFlag);
|
|
}
|
|
|
|
/**
|
|
@}
|
|
*/
|