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/************************************************************************
************************************************************************
FAUST compiler
Copyright (C) 2003-2018 GRAME, Centre National de Creation Musicale
---------------------------------------------------------------------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
************************************************************************/
#include "sigConstantPropagation.hh"
#include <stdlib.h>
#include <cstdlib>
#include "signals.hh"
#include "xtended.hh"
using namespace std;
/********************************************************************
SignalConstantPropagation::transformation(Tree sig) :
Computes constant expressions
**********************************************************************/
Tree SignalConstantPropagation::transformation(Tree sig)
{
faustassert(sig);
int opnum, i;
Tree t1, t2, t3, x, y;
xtended* xt = (xtended*)getUserData(sig);
// primitive elements
if (xt) {
vector<Tree> newBranches;
bool allNums = true;
for (Tree b : sig->branches()) {
Tree c = self(b);
newBranches.push_back(c);
allNums &= isNum(c);
}
if (allNums) {
faustassert(newBranches.size() == xt->arity());
return xt->computeSigOutput(newBranches);
} else {
return tree(sig->node(), newBranches);
}
} else if (isSigDelay1(sig, x)) {
Tree v = self(x);
if (isZero(v)) {
return v;
} else {
return sigDelay1(v);
}
} else if (isSigDelay(sig, x, y)) {
Tree v = self(x);
Tree w = self(y);
if (isZero(v)) {
return v;
} else if (isNum(v) && isZero(w)) {
return v;
} else {
return sigDelay(v, w);
}
} else if (isSigBinOp(sig, &opnum, t1, t2)) {
BinOp* op = gBinOpTable[opnum];
Tree v1 = self(t1);
Tree v2 = self(t2);
Node n1 = v1->node();
Node n2 = v2->node();
if (isNum(n1) && isNum(n2)) {
return tree(op->compute(n1, n2));
} else if (op->isLeftNeutral(n1)) {
return v2;
} else if (op->isLeftAbsorbing(n1)) {
return v1;
} else if (op->isRightNeutral(n2)) {
return v1;
} else if (op->isRightAbsorbing(n2)) {
return v2;
} else if (t1 == t2) {
if ((opnum == kAND) || (opnum == kOR)) {
return t1;
}
if ((opnum == kGE) || (opnum == kLE) || (opnum == kEQ)) {
return sigInt(1);
}
if ((opnum == kGT) || (opnum == kLT) || (opnum == kNE) || (opnum == kRem) ||
(opnum == kXOR)) {
return sigInt(0);
}
}
return sigBinOp(opnum, v1, v2);
} else if (isSigSelect2(sig, t1, t2, t3)) {
Tree v1 = self(t1);
Tree v2 = self(t2);
Tree v3 = self(t3);
Node n1 = v1->node();
if (isZero(n1)) {
return v2;
}
if (isNum(n1)) {
return v3;
}
if (v2 == v3) {
return v2;
}
return sigSelect2(v1, v2, v3);
} else if (isProj(sig, &i, x)) {
Tree r = self(x);
Tree id, le;
if (isRec(r, id, le)) {
Tree v = nth(le, i);
if (isNum(v)) {
return v;
} else {
return sigProj(i, r);
}
} else {
cerr << "ASSERT : SignalConstantPropagation::transformation : " << *sig << endl;
faustassert(false);
return gGlobal->nil; // Fake return to silence warnings
}
} else {
return SignalIdentity::transformation(sig);
}
}
// Public API
Tree constantPropagation(Tree sig, bool trace)
{
SignalConstantPropagation SK;
if (trace) {
SK.trace(true, "ConstProp");
}
return SK.mapself(sig);
}
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