Ejemplos de TargetTransformInfo::getUnrollingPreferences en C++ (Cpp)

Ejemplo n.º 1

Archivo: LoopUnrollPass.cpp Proyecto: unixaaa/llvm

/// Gather the various unrolling parameters based on the defaults, compiler
/// flags, TTI overrides and user specified parameters.
static TargetTransformInfo::UnrollingPreferences gatherUnrollingPreferences(
    Loop *L, const TargetTransformInfo &TTI, Optional<unsigned> UserThreshold,
    Optional<unsigned> UserCount, Optional<bool> UserAllowPartial,
    Optional<bool> UserRuntime) {
  TargetTransformInfo::UnrollingPreferences UP;

  // Set up the defaults
  UP.Threshold = 150;
  UP.PercentDynamicCostSavedThreshold = 50;
  UP.DynamicCostSavingsDiscount = 100;
  UP.OptSizeThreshold = 0;
  UP.PartialThreshold = UP.Threshold;
  UP.PartialOptSizeThreshold = 0;
  UP.Count = 0;
  UP.MaxCount = UINT_MAX;
  UP.FullUnrollMaxCount = UINT_MAX;
  UP.Partial = false;
  UP.Runtime = false;
  UP.AllowRemainder = true;
  UP.AllowExpensiveTripCount = false;
  UP.Force = false;

  // Override with any target specific settings
  TTI.getUnrollingPreferences(L, UP);

  // Apply size attributes
  if (L->getHeader()->getParent()->optForSize()) {
    UP.Threshold = UP.OptSizeThreshold;
    UP.PartialThreshold = UP.PartialOptSizeThreshold;
  }

  // Apply any user values specified by cl::opt
  if (UnrollThreshold.getNumOccurrences() > 0) {
    UP.Threshold = UnrollThreshold;
    UP.PartialThreshold = UnrollThreshold;
  }
  if (UnrollPercentDynamicCostSavedThreshold.getNumOccurrences() > 0)
    UP.PercentDynamicCostSavedThreshold =
        UnrollPercentDynamicCostSavedThreshold;
  if (UnrollDynamicCostSavingsDiscount.getNumOccurrences() > 0)
    UP.DynamicCostSavingsDiscount = UnrollDynamicCostSavingsDiscount;
  if (UnrollMaxCount.getNumOccurrences() > 0)
    UP.MaxCount = UnrollMaxCount;
  if (UnrollFullMaxCount.getNumOccurrences() > 0)
    UP.FullUnrollMaxCount = UnrollFullMaxCount;
  if (UnrollAllowPartial.getNumOccurrences() > 0)
    UP.Partial = UnrollAllowPartial;
  if (UnrollAllowRemainder.getNumOccurrences() > 0)
    UP.AllowRemainder = UnrollAllowRemainder;
  if (UnrollRuntime.getNumOccurrences() > 0)
    UP.Runtime = UnrollRuntime;

  // Apply user values provided by argument
  if (UserThreshold.hasValue()) {
    UP.Threshold = *UserThreshold;
    UP.PartialThreshold = *UserThreshold;
  }
  if (UserCount.hasValue())
    UP.Count = *UserCount;
  if (UserAllowPartial.hasValue())
    UP.Partial = *UserAllowPartial;
  if (UserRuntime.hasValue())
    UP.Runtime = *UserRuntime;

  return UP;
}

Ejemplo n.º 2

Archivo: LoopUnrollPass.cpp Proyecto: gic4107/llvm

/// Gather the various unrolling parameters based on the defaults, compiler
/// flags, TTI overrides, pragmas, and user specified parameters.
static TargetTransformInfo::UnrollingPreferences gatherUnrollingPreferences(
    Loop *L, const TargetTransformInfo &TTI, Optional<unsigned> UserThreshold,
    Optional<unsigned> UserCount, Optional<bool> UserAllowPartial,
    Optional<bool> UserRuntime, unsigned PragmaCount, bool PragmaFullUnroll,
    bool PragmaEnableUnroll, unsigned TripCount) {
  TargetTransformInfo::UnrollingPreferences UP;

  // Set up the defaults
  UP.Threshold = 150;
  UP.PercentDynamicCostSavedThreshold = 20;
  UP.DynamicCostSavingsDiscount = 2000;
  UP.OptSizeThreshold = 0;
  UP.PartialThreshold = UP.Threshold;
  UP.PartialOptSizeThreshold = 0;
  UP.Count = 0;
  UP.MaxCount = UINT_MAX;
  UP.FullUnrollMaxCount = UINT_MAX;
  UP.Partial = false;
  UP.Runtime = false;
  UP.AllowExpensiveTripCount = false;

  // Override with any target specific settings
  TTI.getUnrollingPreferences(L, UP);

  // Apply size attributes
  if (L->getHeader()->getParent()->optForSize()) {
    UP.Threshold = UP.OptSizeThreshold;
    UP.PartialThreshold = UP.PartialOptSizeThreshold;
  }

  // Apply unroll count pragmas
  if (PragmaCount)
    UP.Count = PragmaCount;
  else if (PragmaFullUnroll)
    UP.Count = TripCount;

  // Apply any user values specified by cl::opt
  if (UnrollThreshold.getNumOccurrences() > 0) {
    UP.Threshold = UnrollThreshold;
    UP.PartialThreshold = UnrollThreshold;
  }
  if (UnrollPercentDynamicCostSavedThreshold.getNumOccurrences() > 0)
    UP.PercentDynamicCostSavedThreshold =
        UnrollPercentDynamicCostSavedThreshold;
  if (UnrollDynamicCostSavingsDiscount.getNumOccurrences() > 0)
    UP.DynamicCostSavingsDiscount = UnrollDynamicCostSavingsDiscount;
  if (UnrollCount.getNumOccurrences() > 0)
    UP.Count = UnrollCount;
  if (UnrollMaxCount.getNumOccurrences() > 0)
    UP.MaxCount = UnrollMaxCount;
  if (UnrollFullMaxCount.getNumOccurrences() > 0)
    UP.FullUnrollMaxCount = UnrollFullMaxCount;
  if (UnrollAllowPartial.getNumOccurrences() > 0)
    UP.Partial = UnrollAllowPartial;
  if (UnrollRuntime.getNumOccurrences() > 0)
    UP.Runtime = UnrollRuntime;

  // Apply user values provided by argument
  if (UserThreshold.hasValue()) {
    UP.Threshold = *UserThreshold;
    UP.PartialThreshold = *UserThreshold;
  }
  if (UserCount.hasValue())
    UP.Count = *UserCount;
  if (UserAllowPartial.hasValue())
    UP.Partial = *UserAllowPartial;
  if (UserRuntime.hasValue())
    UP.Runtime = *UserRuntime;

  if (PragmaCount > 0 ||
      ((PragmaFullUnroll || PragmaEnableUnroll) && TripCount != 0)) {
    // If the loop has an unrolling pragma, we want to be more aggressive with
    // unrolling limits. Set thresholds to at least the PragmaTheshold value
    // which is larger than the default limits.
    if (UP.Threshold != NoThreshold)
      UP.Threshold = std::max<unsigned>(UP.Threshold, PragmaUnrollThreshold);
    if (UP.PartialThreshold != NoThreshold)
      UP.PartialThreshold =
          std::max<unsigned>(UP.PartialThreshold, PragmaUnrollThreshold);
  }

  return UP;
}