[mlgo][regalloc] Factor live interval feature calculation

[mtrofin]

Summary

Factoring it out so we can subsequently cache it. This should be a NFC,
however, for the float quantities, we see small errors in the least
significant digits. This is because, before, we were summing up one by
one. Now, we sum up results of sums.

This shouldn't matter for ML, and will require rework when we do
quantization (avoiding floats altogether), but meanwhile, it did require
an update to the reference file used for testing.

The patch also bumps the precision of the variables involved in this, to
reduce the error (note they are casted back to float at the end by the
SET macro, since we only work with float and not double in TF)

[mtrofin]

the start/end freq can stay float, they don't participate in the sums

llvm/lib/CodeGen/MLRegallocEvictAdvisor.cpp

 void resetInputs(MLModelRunner &Runner) {
 #define _RESET(TYPE, NAME, SHAPE, __)                                          \
   std::memset(Runner.getTensorUntyped(FeatureIDs::NAME), 0,                    \
               getTotalSize<TYPE>(SHAPE));
   RA_EVICT_FEATURES_LIST(_RESET)
 #undef _RESET
 }
 
+// Per-live interval components that get aggregated into the feature values that
+// will be passed to the evaluator.
+struct LIFeatureComponents {
+  double R = 0;
+  double W = 0;
+  double RW = 0;
+  double IndVarUpdates = 0;
+  double HintWeights = 0.0;
+  int64_t NrDefsAndUses = 0;
+  float HottestBlockFreq = 0.0;
+  bool HasPreferredReg = false;
+  bool IsRemat = false;
+};
+
 using CandidateRegList =
     std::array<std::pair<MCRegister, bool>, NumberOfInterferences>;
 using FeaturesListNormalizer = std::array<float, FeatureIDs::FeatureCount>;
 
 /// The ML evictor (commonalities between release and development mode)
 class MLEvictAdvisor : public RegAllocEvictionAdvisor {
 public:
   MLEvictAdvisor(MachineFunction &MF, const RAGreedy &RA, MLModelRunner *Runner,
private:
   // Point-in-time: we didn't learn this, so we always delegate to the default.
   bool canEvictHintInterference(
       LiveInterval &VirtReg, MCRegister PhysReg,
       const SmallVirtRegSet &FixedRegisters) const override {
     return getDefaultAdvisor().canEvictHintInterference(VirtReg, PhysReg,
                                                         FixedRegisters);
   }
 
+  const LIFeatureComponents
+  getLIFeatureComponents(const LiveInterval &LI) const;
+
   // Hold on to a default advisor for:
   // 1) the implementation of canEvictHintInterference, because we didn't learn
   // that nuance yet;
   // 2) for bootstrapping (logging) in the development mode case.
   const DefaultEvictionAdvisor DefaultAdvisor;
   MLModelRunner *const Runner;
   const MachineBlockFrequencyInfo &MBFI;
   const MachineLoopInfo &Loops;
if (CandidatePos == CandidateVirtRegPos) {
     assert(!MustFindEviction);
     return MCRegister::NoRegister;
   }
   assert(CandidatePos < ValidPosLimit);
   (void)ValidPosLimit;
   return Regs[CandidatePos].first;
 }
 
+const LIFeatureComponents
+MLEvictAdvisor::getLIFeatureComponents(const LiveInterval &LI) const {
+  LIFeatureComponents Ret;
+  SmallPtrSet<MachineInstr *, 8> Visited;
+  const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
+  Ret.HasPreferredReg = VRM->hasPreferredPhys(LI.reg());
+
+  for (MachineRegisterInfo::reg_instr_nodbg_iterator
+           I = MRI->reg_instr_nodbg_begin(LI.reg()),
+           E = MRI->reg_instr_nodbg_end();
+       I != E;) {
+    MachineInstr *MI = &*(I++);
+
+    ++Ret.NrDefsAndUses;
+    if (!Visited.insert(MI).second)
+      continue;
+
+    if (MI->isIdentityCopy() || MI->isImplicitDef())
+      continue;
+
+    bool Reads, Writes;
+    std::tie(Reads, Writes) = MI->readsWritesVirtualRegister(LI.reg());
+
+    float Freq = MBFI.getBlockFreqRelativeToEntryBlock(MI->getParent());
+    Ret.HottestBlockFreq = std::max(Freq, Ret.HottestBlockFreq);
+
+    Ret.R += (Reads && !Writes) * Freq;
+    Ret.W += (!Reads && Writes) * Freq;
+    Ret.RW += (Reads && Writes) * Freq;
+
+    auto *MBB = MI->getParent();
+    auto *Loop = Loops.getLoopFor(MBB);
+    bool IsExiting = Loop ? Loop->isLoopExiting(MBB) : false;
+
+    if (Writes && IsExiting && LIS->isLiveOutOfMBB(LI, MBB))
+      Ret.IndVarUpdates += Freq;
+
+    if (MI->isCopy() && VirtRegAuxInfo::copyHint(MI, LI.reg(), TRI, *MRI))
+      Ret.HintWeights += Freq;
+  }
+  Ret.IsRemat = VirtRegAuxInfo::isRematerializable(
+      LI, *LIS, *VRM, *MF.getSubtarget().getInstrInfo());
+  return Ret;
+}
+
 // Overall, this currently mimics what we do for weight calculation, but instead
 // of accummulating the various features, we keep them separate.
 void MLEvictAdvisor::extractFeatures(
     const SmallVectorImpl<LiveInterval *> &Intervals,
     std::array<float, FeatureIDs::FeatureCount> &Largest, size_t Pos,
     int64_t IsHint, int64_t LocalIntfsCount, float NrUrgent) const {
   int64_t NrDefsAndUses = 0;
   int64_t NrBrokenHints = 0;
-  float R = 0;
-  float W = 0;
-  float RW = 0;
-  float IndVarUpdates = 0;
-  float HintWeights = 0.0;
+  double R = 0.0;
+  double W = 0.0;
+  double RW = 0.0;
+  double IndVarUpdates = 0.0;
+  double HintWeights = 0.0;
   float StartBBFreq = 0.0;
   float EndBBFreq = 0.0;
   float HottestBlockFreq = 0.0;
   int32_t NrRematerializable = 0;
   float TotalWeight = 0.0;
 
   SlotIndex EndSI = LIS->getSlotIndexes()->getZeroIndex();
   SlotIndex StartSI = LIS->getSlotIndexes()->getLastIndex();
for (const auto *L : Intervals) {
 
     TotalWeight = std::max(TotalWeight, LI.weight());
 
     if (LI.beginIndex() < StartSI)
       StartSI = LI.beginIndex();
 
     if (LI.endIndex() > EndSI)
       EndSI = LI.endIndex();
+    const LIFeatureComponents LIFC = getLIFeatureComponents(LI);
+    NrBrokenHints += LIFC.HasPreferredReg;
 
-    SmallPtrSet<MachineInstr *, 8> Visited;
-    const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
-    NrBrokenHints += VRM->hasPreferredPhys(LI.reg());
-
-    for (MachineRegisterInfo::reg_instr_nodbg_iterator
-             I = MRI->reg_instr_nodbg_begin(LI.reg()),
-             E = MRI->reg_instr_nodbg_end();
-         I != E;) {
-      MachineInstr *MI = &*(I++);
-
-      ++NrDefsAndUses;
-      if (!Visited.insert(MI).second)
-        continue;
-
-      if (MI->isIdentityCopy() || MI->isImplicitDef())
-        continue;
-
-      bool Reads, Writes;
-      std::tie(Reads, Writes) = MI->readsWritesVirtualRegister(LI.reg());
-
-      float Freq = MBFI.getBlockFreqRelativeToEntryBlock(MI->getParent());
-      if (Freq > HottestBlockFreq)
-        HottestBlockFreq = Freq;
-      R += (Reads && !Writes) * Freq;
-      W += (!Reads && Writes) * Freq;
-      RW += (Reads && Writes) * Freq;
-
-      auto *MBB = MI->getParent();
-      auto *Loop = Loops.getLoopFor(MBB);
-      bool IsExiting = Loop ? Loop->isLoopExiting(MBB) : false;
+    NrDefsAndUses += LIFC.NrDefsAndUses;
+    HottestBlockFreq = std::max(HottestBlockFreq, LIFC.HottestBlockFreq);
+    R += LIFC.R;
+    W += LIFC.W;
+    RW += LIFC.RW;
 
-      if (Writes && IsExiting && LIS->isLiveOutOfMBB(LI, MBB))
-        IndVarUpdates += Freq;
+    IndVarUpdates += LIFC.IndVarUpdates;
 
-      if (MI->isCopy() && VirtRegAuxInfo::copyHint(MI, LI.reg(), TRI, *MRI))
-        HintWeights += Freq;
-    }
-    NrRematerializable += VirtRegAuxInfo::isRematerializable(
-        LI, *LIS, *VRM, *MF.getSubtarget().getInstrInfo());
+    HintWeights += LIFC.HintWeights;
+    NrRematerializable += LIFC.IsRemat;
   }
   size_t Size = 0;
   if (!Intervals.empty()) {
     StartBBFreq =
         MBFI.getBlockFreqRelativeToEntryBlock(LIS->getMBBFromIndex(StartSI));
     if (EndSI >= LIS->getSlotIndexes()->getLastIndex())
       EndSI = LIS->getSlotIndexes()->getLastIndex().getPrevIndex();
     EndBBFreq =

llvm/test/CodeGen/MLRegalloc/Inputs/reference-log-noml.txt

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