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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.
************************************************************************
************************************************************************/
#ifndef _CODE_LOOP_H
#define _CODE_LOOP_H
#include <list>
#include <map>
#include <set>
#include <string>
#include <vector>
#include "fir_function_builder.hh"
#include "garbageable.hh"
#include "list.hh"
#include "tree.hh"
// Loop internal code
/*
We have independent loops that will be "connected" with vectors
We would like to be able to connect loops and remove the intermediate vectors.
We start from a DAG of loops, we want to be able to:
- put this DAG on the form of a sequence of loops (topological sorting)
- merge all the loops into one, so basically extract the loops code and merge it
Scalarization of a loop:
- identify all input and output vectors
- transform the vectors into scalars
- transform the accesses (Load/Store) into scalar accesses
*/
class CodeLoop;
typedef std::set<CodeLoop*> lclset;
typedef std::vector<lclset> lclgraph;
class CodeLoop : public virtual Garbageable {
friend class CodeContainer;
private:
bool fIsRecursive; ///< recursive loops can't be SIMDed
Tree fRecSymbolSet; ///< recursive loops define a set of recursive symbol
CodeLoop* const fEnclosingLoop; ///< Loop from which this one originated
int fSize; ///< number of iterations of the loop
int fOrder; ///< used during topological sort
int fIndex;
BlockInst* fPreInst;
BlockInst* fComputeInst;
BlockInst* fPostInst;
std::string fLoopIndex;
int fUseCount; ///< how many loops depend on this one
std::list<CodeLoop*> fExtraLoops; ///< extra loops that where in sequences
std::set<Tree> fRecDependencies; ///< Loops having recursive dependencies must be merged
std::set<CodeLoop*> fBackwardLoopDependencies; ///< Loops that must be computed before this one
std::set<CodeLoop*> fForwardLoopDependencies; ///< Loops that will be computed after this one
void pushBlock(BlockInst* block, BlockInst* loop)
{
for (const auto& it : block->fCode) {
loop->pushBackInst(it);
}
}
bool isEmpty(); ///< true when the loop doesn't contain any line of code
void absorb(CodeLoop* l); ///< absorb a loop inside this one
void concat(CodeLoop* l);
// Graph sorting
static void setOrder(CodeLoop* l, int order, lclgraph& V);
static void setLevel(int order, const lclset& T1, lclset& T2, lclgraph& V);
static void resetOrder(CodeLoop* l, std::set<CodeLoop*>& visited);
public:
///< create a recursive loop
CodeLoop(Tree recsymbol, CodeLoop* encl, const std::string& index_name, int size = 0)
: fIsRecursive(true),
fRecSymbolSet(singleton(recsymbol)),
fEnclosingLoop(encl),
fSize(size),
fOrder(-1),
fIndex(-1),
fPreInst(new BlockInst()),
fComputeInst(new BlockInst()),
fPostInst(new BlockInst()),
fLoopIndex(index_name),
fUseCount(0)
{
}
///< create a non recursive loop
CodeLoop(CodeLoop* encl, const std::string& index_name, int size = 0)
: fIsRecursive(false),
fRecSymbolSet(gGlobal->nil),
fEnclosingLoop(encl),
fSize(size),
fOrder(-1),
fIndex(-1),
fPreInst(new BlockInst()),
fComputeInst(new BlockInst()),
fPostInst(new BlockInst()),
fLoopIndex(index_name),
fUseCount(0)
{
}
StatementInst* pushPreComputeDSPMethod(StatementInst* inst)
{
fPreInst->pushBackInst(inst);
return inst;
}
StatementInst* pushComputeDSPMethod(StatementInst* inst)
{
fComputeInst->pushBackInst(inst);
return inst;
}
StatementInst* pushPostComputeDSPMethod(StatementInst* inst)
{
fPostInst->pushBackInst(inst);
return inst;
}
bool isRecursive() { return fIsRecursive; }
int getIndex() { return fIndex; }
std::set<CodeLoop*>& getForwardLoopDependencies() { return fForwardLoopDependencies; }
std::set<CodeLoop*>& getBackwardLoopDependencies() { return fBackwardLoopDependencies; }
ValueInst* getLoopIndex() { return IB::genLoadLoopVar(fLoopIndex); }
ForLoopInst* generateScalarLoop(const std::string& counter, bool loop_var_in_bytes = false);
// For SYFALA : loop with a fixed size (known at compile time)
ForLoopInst* generateFixedScalarLoop();
// For Rust backend
SimpleForLoopInst* generateSimpleScalarLoop(const std::string& counter);
IteratorForLoopInst* generateSimpleScalarLoop(const std::vector<std::string>& iterators);
BlockInst* generateOneSample();
void generateDAGScalarLoop(BlockInst* block, ValueInst* count, bool omp);
void transform(DispatchVisitor* visitor)
{
// Transform extra loops
for (const auto& s : fExtraLoops) {
s->transform(visitor);
}
fPreInst->accept(visitor);
fComputeInst->accept(visitor);
fPostInst->accept(visitor);
}
bool hasRecDependencyIn(Tree S); ///< returns true is this loop has recursive dependencies
void addBackwardDependency(CodeLoop* ls) { fBackwardLoopDependencies.insert(ls); }
static void sortGraph(CodeLoop* root, lclgraph& V);
static void computeUseCount(CodeLoop* l);
static void groupSeqLoops(CodeLoop* l, std::set<CodeLoop*>& visited);
};
#endif
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