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JIT: Add a disabled-by-default implementation of strength reduction #104243

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merged 6 commits into from
Jul 4, 2024
Merged

JIT: Add a disabled-by-default implementation of strength reduction #104243

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1786472
JIT: Add a disabled-by-default implementation of strength reduction
jakobbotsch Jun 28, 2024
efb641c
Fix a GC hole
jakobbotsch Jul 1, 2024
3a1850a
Disallow GC typed add recs
jakobbotsch Jul 2, 2024
7c0e2f8
Merge branch 'main' of github.com:dotnet/runtime into strength-reduct…
jakobbotsch Jul 2, 2024
3d66247
Disable strength reduction
jakobbotsch Jul 2, 2024
c06728d
Fix some comments
jakobbotsch Jul 3, 2024
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5 changes: 5 additions & 0 deletions src/coreclr/jit/arraystack.h
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Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,11 @@ class ArrayStack
tosIndex = 0;
}

T* Data()
{
return data;
}

private:
CompAllocator m_alloc;
int tosIndex; // first free location
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6 changes: 4 additions & 2 deletions src/coreclr/jit/compiler.h
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Expand Up @@ -6430,11 +6430,9 @@ class Compiler
Statement* fgNewStmtAtEnd(BasicBlock* block, GenTree* tree, const DebugInfo& di = DebugInfo());
Statement* fgNewStmtNearEnd(BasicBlock* block, GenTree* tree, const DebugInfo& di = DebugInfo());

private:
void fgInsertStmtNearEnd(BasicBlock* block, Statement* stmt);
void fgInsertStmtAtBeg(BasicBlock* block, Statement* stmt);

public:
void fgInsertStmtAfter(BasicBlock* block, Statement* insertionPoint, Statement* stmt);
void fgInsertStmtBefore(BasicBlock* block, Statement* insertionPoint, Statement* stmt);

Expand Down Expand Up @@ -7562,6 +7560,8 @@ class Compiler

PhaseStatus optInductionVariables();

template <typename TFunctor>
void optVisitBoundingExitingCondBlocks(FlowGraphNaturalLoop* loop, TFunctor func);
bool optMakeLoopDownwardsCounted(ScalarEvolutionContext& scevContext,
FlowGraphNaturalLoop* loop,
LoopLocalOccurrences* loopLocals);
Expand Down Expand Up @@ -10344,6 +10344,8 @@ class Compiler
STRESS_MODE(OPT_REPEAT) /* stress JitOptRepeat */ \
STRESS_MODE(INITIAL_PARAM_REG) /* Stress initial register assigned to parameters */ \
STRESS_MODE(DOWNWARDS_COUNTED_LOOPS) /* Make more loops downwards counted */ \
STRESS_MODE(STRENGTH_REDUCTION) /* Enable strength reduction */ \
STRESS_MODE(STRENGTH_REDUCTION_PROFITABILITY) /* Do more strength reduction */ \
\
/* After COUNT_VARN, stress level 2 does all of these all the time */ \
\
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