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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 General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
************************************************************************/
#include "sigPromotion.hh"
#include <stdlib.h>
#include <cstdlib>
#include <map>
#include "global.hh"
#include "ppsig.hh"
#include "property.hh"
#include "signals.hh"
#include "sigtyperules.hh"
#include "tlib.hh"
#include "tree.hh"
#include "xtended.hh"
//-------------------------SignalPromotion-------------------------------
// Adds explicite int or float cast when needed. This is needed prior
// to any optimisations to avoid to scramble int and float expressions
//----------------------------------------------------------------------
Tree SignalPromotion::transformation(Tree sig)
{
int i;
Tree sel, x, y, z;
if (isSigFixDelay(sig, x, y)) {
return sigFixDelay(self(x), smartIntCast(getCertifiedSigType(y), self(y)));
}
// Binary operations
// kAdd, kSub, kMul, kDiv, kRem, kLsh, kRsh, kGT, kLT, kGE, kLE, kEQ, kNE, kAND, kOR, kXOR };
else if (isSigBinOp(sig, &i, x, y)) {
Type tx = getCertifiedSigType(x);
Type ty = getCertifiedSigType(y);
switch (i) {
case kAdd:
case kSub:
case kMul:
case kGT:
case kLT:
case kGE:
case kLE:
case kEQ:
case kNE:
if (tx->nature() == ty->nature()) {
// same nature => no promotion needed
return sigBinOp(i, self(x), self(y));
} else {
// float promotion needed
return sigBinOp(i, smartFloatCast(tx, self(x)), smartFloatCast(ty, self(y)));
}
case kRem:
if (tx->nature() == kInt && ty->nature() == kInt) {
// int arguments => no promotion needed
return sigBinOp(i, self(x), self(y));
} else {
// float promotion needed, rem (%) replaced by fmod
vector<Tree> lsig = {smartFloatCast(tx, self(x)), smartFloatCast(ty, self(y))};
return gGlobal->gFmodPrim->computeSigOutput(lsig);
}
case kDiv:
// the result of a division is always a float
return sigBinOp(i, smartFloatCast(tx, self(x)), smartFloatCast(ty, self(y)));
default:
// TODO: no clear rules here
return sigBinOp(i, self(x), self(y));
}
}
// Select2 and Select3
else if (isSigSelect2(sig, sel, x, y)) {
Type ts = getCertifiedSigType(sel);
Type tx = getCertifiedSigType(x);
Type ty = getCertifiedSigType(y);
if (tx->nature() == ty->nature()) {
// same nature => no promotion needed
return sigSelect2(smartIntCast(ts, self(sel)), self(x), self(y));
} else {
// float promotion needed
return sigSelect2(smartIntCast(ts, self(sel)), smartFloatCast(tx, self(x)), smartFloatCast(ty, self(y)));
}
} else if (isSigSelect3(sig, sel, x, y, z)) {
Type ts = getCertifiedSigType(sel);
Type tx = getCertifiedSigType(x);
Type ty = getCertifiedSigType(y);
Type tz = getCertifiedSigType(z);
if ((tx->nature() == ty->nature()) && (tx->nature() == tz->nature())) {
// same nature => no promotion needed
return sigSelect3(smartIntCast(ts, self(sel)), self(x), self(y), self(z));
} else {
// float promotion needed
return sigSelect3(smartIntCast(ts, self(sel)), smartFloatCast(tx, self(x)), smartFloatCast(ty, self(y)),
smartFloatCast(tz, self(z)));
}
}
// Int and Float Cast
else if (isSigIntCast(sig, x)) {
return smartIntCast(getCertifiedSigType(x), self(x));
} else if (isSigFloatCast(sig, x)) {
return smartFloatCast(getCertifiedSigType(x), self(x));
}
// Other cases => identity transformation
else {
return SignalIdentity::transformation(sig);
}
}
/*
## smartIntCast[S] : adds an intCast(S) only if needed
smartIntCast[S] = intCast(S) when type(S) = float
smartIntCast[S] = S otherwise
*/
Tree SignalPromotion::smartIntCast(Type t, Tree sig)
{
if (t->nature() == kReal) {
return sigIntCast(sig);
} else {
return sig;
}
}
/*
## smartFloatCast[S] : adds a floatCast(S) only if needed
smartFloatCast[S] = floatCast(S) when type(S) = int
= S otherwise
*/
Tree SignalPromotion::smartFloatCast(Type t, Tree sig)
{
if (t->nature() == kInt) {
return sigFloatCast(sig);
} else {
return sig;
}
}
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