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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#ifndef TARGET_GENX_PRESSURE_TRACKER_H
#define TARGET_GENX_PRESSURE_TRACKER_H
#include <vector>
namespace llvm {
class Value;
class GenXLiveness;
class FunctionGroup;
class DataLayout;
namespace genx {
class LiveRange;
class PressureTracker {
const DataLayout &DL;
FunctionGroup &FG;
GenXLiveness *Liveness = nullptr;
// Flag to widen byte vectors to word vectors if applicable.
bool WithByteWidening;
// Candidate variable for widening.
std::vector<LiveRange *> WidenCandidates;
std::vector<unsigned> Pressure;
static const unsigned THRESHOLD = sizeof(float) * 8 * 120;
struct Segment {
unsigned Begin;
unsigned End;
Segment(unsigned B, unsigned E) : Begin(B), End(E) {}
};
std::vector<Segment> HighPressureSegments;
public:
PressureTracker(const DataLayout& DL, FunctionGroup &FG, GenXLiveness *L,
bool WithByteWidening = false)
: DL(DL), FG(FG), Liveness(L), WithByteWidening(WithByteWidening) {
calculate();
calculateRedSegments();
}
// Estimate the register pressure for each Instruction number.
void calculate();
// Calculate high pressure segments.
void calculateRedSegments();
// Check if segment [B, E] intersects with a high pressure region or not.
bool intersectWithRedRegion(unsigned B, unsigned E) const;
bool intersectWithRedRegion(LiveRange *LR) const;
// Return the list of variables that are likely to be widened.
const std::vector<LiveRange *> &getWidenVariables() { return WidenCandidates; }
// Decrease pressure assuming no widening on variable for LR.
void decreasePressure(LiveRange *LR);
private:
void getLiveRanges(std::vector<LiveRange *> &LRs);
void getLiveRangesForValue(Value *V, std::vector<LiveRange *> &LRs) const;
unsigned getSizeInBytes(LiveRange *LR, bool AllowWidening);
};
} // namespace genx
} // namespace llvm
#endif // TARGET_GENX_PRESSURE_TRACKER_H
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