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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#ifndef __SPLITALIGNEDSCALARS_H__
#define __SPLITALIGNEDSCALARS_H__
#include "visa/GraphColor.h"
namespace vISA {
class SplitAlignedScalars {
private:
// Constant trip count assume for each loop to estimate dynamic inst
// count change due to splitting.
const unsigned int EstimatedLoopTripCount = 4;
// Minimum instruction distance required for splitting
unsigned int MinOptDist = 0;
// Threshold percent increase in estimated dynamic inst count allowed
float BloatAllowed = 0.0f;
unsigned int numDclsReplaced = 0;
unsigned int numMovsAdded = 0;
GlobalRA &gra;
GraphColor &coloring;
G4_Kernel &kernel;
bool changesMade = false;
class Data {
public:
unsigned int firstDef = 0;
unsigned int lastUse = 0;
bool allowed = true;
unsigned int getDUMaxDist() {
return std::abs((int)lastUse - (int)firstDef);
};
std::vector<std::pair<G4_BB *, G4_INST *>> defs;
// store vector of <bb, inst, src#>
std::vector<std::tuple<G4_BB *, G4_INST *, unsigned int>> uses;
};
std::unordered_map<G4_Declare *, Data> dclData;
std::unordered_map<G4_Declare *, G4_Declare *> oldNewDcls;
bool static canReplaceDst(G4_INST *inst);
bool static canReplaceSrc(G4_INST *inst, unsigned int idx);
bool heuristic(G4_Declare *dcl, Data &d);
bool isDclCandidate(G4_Declare *dcl);
std::vector<G4_Declare *> gatherCandidates();
void pruneCandidates(std::vector<G4_Declare *> &candidates);
unsigned int computeNumMovs(G4_Declare *dcl);
template <class T> G4_Declare *getDclForRgn(T *rgn, G4_Declare *newTopDcl);
// store set of dcls marked as spill in current RA iteration
std::unordered_set<G4_Declare *> spilledDclSet;
// store spill cost for each dcl
std::unordered_map<G4_Declare *, float> dclSpillCost;
// store dcls that have callee save bias
std::unordered_set<G4_Declare *> calleeSaveBiased;
public:
SplitAlignedScalars(GlobalRA &g, GraphColor &c)
: gra(g), coloring(c), kernel(g.kernel) {
MinOptDist =
g.kernel.getOptions()->getuInt32Option(vISA_SplitAlignedScalarMinDist);
BloatAllowed = g.kernel.getOptions()->getuInt32Option(
vISA_SplitAlignedScalarBloatPPT) / 1000.0f;
for (auto spill : coloring.getSpilledLiveRanges()) {
spilledDclSet.insert(spill->getDcl());
}
auto numVars = coloring.getNumVars();
auto lrs = coloring.getLiveRanges();
for (unsigned int i = 0; i != numVars; ++i) {
auto rootDcl = lrs[i]->getDcl();
dclSpillCost[rootDcl] = lrs[i]->getSpillCost();
if (lrs[i]->getCalleeSaveBias())
calleeSaveBiased.insert(rootDcl);
}
}
void run();
bool getChangesMade() { return changesMade; }
void dump(std::ostream &of = std::cerr);
};
} // namespace vISA
#endif
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