New directory tree, with preprocessor/ inside interpretor/.

[Faustine.git] / interpretor / preprocessor / faust-0.9.47mr3 / compiler / normalize / normalize.cpp

diff --git a/interpretor/preprocessor/faust-0.9.47mr3/compiler/normalize/normalize.cpp b/interpretor/preprocessor/faust-0.9.47mr3/compiler/normalize/normalize.cpp
new file mode 100644 (file)
index 0000000..44e8f45
--- /dev/null
+++ b/interpretor/preprocessor/faust-0.9.47mr3/compiler/normalize/normalize.cpp
@@ -0,0 +1,122 @@
+#include <stdio.h>
+#include <assert.h>
+#include "tlib.hh"
+#include "signals.hh"
+#include "sigprint.hh"
+#include "ppsig.hh"
+#include "simplify.hh"
+#include "normalize.hh"
+#include "sigorderrules.hh"
+#include <map>
+#include <list>
+
+#include "mterm.hh"
+#include "aterm.hh"
+
+#if 0
+static void countAddTerm (map<Tree,Tree>& M, Tree t, bool invflag);
+static void incTermCount (map<Tree,int>& M, Tree t, bool invflag);
+static Tree buildPowTerm (Tree f, int q);
+static Tree simplifyingReorganizingMul(Tree t1, Tree t2);
+static Tree reorganizingMul(Tree k, Tree t);
+static void factorizeAddTerm(map<Tree,Tree>& M);
+#endif
+
+#undef TRACE
+
+/**
+ * Compute the Add-Normal form of a term t.
+ * \param t the term to be normalized
+ * \return the normalized term
+ */
+Tree normalizeAddTerm(Tree t)
+{
+#ifdef TRACE
+       cerr << "START normalizeAddTerm : " << ppsig(t) << endl;
+#endif
+       
+       aterm A(t);
+       //cerr << "ATERM IS : " << A << endl;
+       mterm D = A.greatestDivisor();
+       while (D.isNotZero() && D.complexity() > 0) {
+               //cerr << "GREAT DIV : " << D << endl;
+               A = A.factorize(D);
+               D = A.greatestDivisor();
+       }
+       return A.normalizedTree();
+}
+
+
+/**
+ * Compute the normal form of a 1-sample delay term s'.
+ * The normalisation rules are :
+ *             0' -> 0 /// INACTIVATE dec07 bug recursion
+ *             (k*s)' -> k*s'
+ *             (s/k)' -> s'/k
+ * \param s the term to be delayed by 1 sample
+ * \return the normalized term
+ */
+Tree normalizeDelay1Term(Tree s)
+{
+       return normalizeFixedDelayTerm(s, tree(1));
+}
+
+
+/**
+ * Compute the normal form of a fixed delay term (s@d).
+ * The normalisation rules are :
+ *             s@0 -> s
+ *             0@d -> 0
+ *             (k*s)@d -> k*(s@d)
+ *             (s/k)@d -> (s@d)/k
+ *             (s@n)@m -> s@(n+m)
+ * Note that the same rules can't be applied to
+ * + et - becaue the value of the first d samples
+ * would be wrong. We could also add delays such that
+ * \param s the term to be delayed
+ * \param d the value of the delay
+ * \return the normalized term
+ */
+
+Tree normalizeFixedDelayTerm(Tree s, Tree d)
+{
+       Tree x, y, r;
+       int i;
+
+       if (isZero(d) && ! isProj(s, &i, r)) {
+
+        return s;
+
+       } else if (isZero(s)) {
+
+        return s;
+
+       } else if (isSigMul(s, x, y)) {
+
+               if (getSigOrder(x) < 2) {
+            return /*simplify*/(sigMul(x,normalizeFixedDelayTerm(y,d)));
+               } else if (getSigOrder(y) < 2) {
+            return /*simplify*/(sigMul(y,normalizeFixedDelayTerm(x,d)));
+               } else {
+                       return sigFixDelay(s,d);
+               }
+
+       } else if (isSigDiv(s, x, y)) {
+
+               if (getSigOrder(y) < 2) {
+            return /*simplify*/(sigDiv(normalizeFixedDelayTerm(x,d),y));
+               } else {
+                       return sigFixDelay(s,d);
+               }
+
+       } else if (isSigFixDelay(s, x, y)) {
+               // (x@n)@m = x@(n+m)
+//             return sigFixDelay(x,tree(tree2int(d)+tree2int(y)));
+               return normalizeFixedDelayTerm(x,simplify(sigAdd(d,y))); 
+
+       } else {
+
+               return sigFixDelay(s,d);
+       }
+}
+