Add a subclass of IntrinsicInst for llvm.assume [nfc]

Add the subclass, update a few places which check for the intrinsic to use idiomatic dyn_cast, and update the public interface of AssumptionCache to use the new class.  A follow up change will do the same for the newer assumption query/bundle mechanisms.

include/llvm/Analysis/AssumptionCache.h

@@ -26,7 +26,7 @@
 
 namespace llvm {
 
-class CallInst;
+class AssumeInst;
 class Function;
 class raw_ostream;
 class Value;
@@ -116,15 +116,15 @@ public:
   ///
   /// The call passed in must be an instruction within this function and must
   /// not already be in the cache.
-  void registerAssumption(CallInst *CI);
+  void registerAssumption(AssumeInst *CI);
 
   /// Remove an \@llvm.assume intrinsic from this function's cache if it has
   /// been added to the cache earlier.
-  void unregisterAssumption(CallInst *CI);
+  void unregisterAssumption(AssumeInst *CI);
 
   /// Update the cache of values being affected by this assumption (i.e.
   /// the values about which this assumption provides information).
-  void updateAffectedValues(CallInst *CI);
+  void updateAffectedValues(AssumeInst *CI);
 
   /// Clear the cache of \@llvm.assume intrinsics for a function.
   ///

include/llvm/IR/IntrinsicInst.h

@@ -1217,6 +1217,18 @@ public:
   }
 };
 
+
+/// This represents the llvm.assume intrinsic.
+class AssumeInst : public IntrinsicInst {
+public:
+  static bool classof(const IntrinsicInst *I) {
+    return I->getIntrinsicID() == Intrinsic::assume;
+  }
+  static bool classof(const Value *V) {
+    return isa<IntrinsicInst>(V) && classof(cast<IntrinsicInst>(V));
+  }
+};
+
 } // end namespace llvm
 
 #endif // LLVM_IR_INTRINSICINST_H

lib/Analysis/AssumptionCache.cpp

@@ -56,7 +56,7 @@ AssumptionCache::getOrInsertAffectedValues(Value *V) {
 }
 
 static void
-findAffectedValues(CallInst *CI,
+findAffectedValues(CallBase *CI,
                    SmallVectorImpl<AssumptionCache::ResultElem> &Affected) {
   // Note: This code must be kept in-sync with the code in
   // computeKnownBitsFromAssume in ValueTracking.
@@ -126,7 +126,7 @@ findAffectedValues(CallInst *CI,
   }
 }
 
-void AssumptionCache::updateAffectedValues(CallInst *CI) {
+void AssumptionCache::updateAffectedValues(AssumeInst *CI) {
   SmallVector<AssumptionCache::ResultElem, 16> Affected;
   findAffectedValues(CI, Affected);
 
@@ -139,7 +139,7 @@ void AssumptionCache::updateAffectedValues(CallInst *CI) {
   }
 }
 
-void AssumptionCache::unregisterAssumption(CallInst *CI) {
+void AssumptionCache::unregisterAssumption(AssumeInst *CI) {
   SmallVector<AssumptionCache::ResultElem, 16> Affected;
   findAffectedValues(CI, Affected);
 
@@ -211,13 +211,10 @@ void AssumptionCache::scanFunction() {
 
   // Update affected values.
   for (auto &A : AssumeHandles)
-    updateAffectedValues(cast<CallInst>(A));
+    updateAffectedValues(cast<AssumeInst>(A));
 }
 
-void AssumptionCache::registerAssumption(CallInst *CI) {
-  assert(match(CI, m_Intrinsic<Intrinsic::assume>()) &&
-         "Registered call does not call @llvm.assume");
-
+void AssumptionCache::registerAssumption(AssumeInst *CI) {
   // If we haven't scanned the function yet, just drop this assumption. It will
   // be found when we scan later.
   if (!Scanned)

lib/Transforms/InstCombine/InstCombineCalls.cpp

@@ -1619,7 +1619,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
               {RetainedKnowledge{Attribute::NonNull, 0, A}}, Next, &AC, &DT)) {
 
         Replacement->insertBefore(Next);
-        AC.registerAssumption(Replacement);
+        AC.registerAssumption(cast<AssumeInst>(Replacement));
         return RemoveConditionFromAssume(II);
       }
     }
@@ -1651,7 +1651,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
                   buildAssumeFromKnowledge(RK, Next, &AC, &DT)) {
 
             Replacement->insertAfter(II);
-            AC.registerAssumption(Replacement);
+            AC.registerAssumption(cast<AssumeInst>(Replacement));
           }
           return RemoveConditionFromAssume(II);
         }
@@ -1699,7 +1699,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
 
     // Update the cache of affected values for this assumption (we might be
     // here because we just simplified the condition).
-    AC.updateAffectedValues(II);
+    AC.updateAffectedValues(cast<AssumeInst>(II));
     break;
   }
   case Intrinsic::experimental_guard: {

lib/Transforms/InstCombine/InstructionCombining.cpp

@@ -3983,7 +3983,7 @@ static bool combineInstructionsOverFunction(
       IRBuilderCallbackInserter([&Worklist, &AC](Instruction *I) {
         Worklist.add(I);
         if (match(I, m_Intrinsic<Intrinsic::assume>()))
-          AC.registerAssumption(cast<CallInst>(I));
+          AC.registerAssumption(cast<AssumeInst>(I));
       }));
 
   // Lower dbg.declare intrinsics otherwise their value may be clobbered

lib/Transforms/Scalar/LoopUnswitch.cpp

@@ -1436,9 +1436,8 @@ void LoopUnswitch::unswitchNontrivialCondition(
     for (Instruction &I : *NewBlocks[NBI]) {
       RemapInstruction(&I, VMap,
                        RF_NoModuleLevelChanges | RF_IgnoreMissingLocals);
-      if (auto *II = dyn_cast<IntrinsicInst>(&I))
-        if (II->getIntrinsicID() == Intrinsic::assume)
-          AC->registerAssumption(II);
+      if (auto *II = dyn_cast<AssumeInst>(&I))
+        AC->registerAssumption(II);
     }
   }
 

lib/Transforms/Scalar/SimpleLoopUnswitch.cpp

@@ -1113,9 +1113,8 @@ static BasicBlock *buildClonedLoopBlocks(
     for (Instruction &I : *ClonedBB) {
       RemapInstruction(&I, VMap,
                        RF_NoModuleLevelChanges | RF_IgnoreMissingLocals);
-      if (auto *II = dyn_cast<IntrinsicInst>(&I))
-        if (II->getIntrinsicID() == Intrinsic::assume)
-          AC.registerAssumption(II);
+      if (auto *II = dyn_cast<AssumeInst>(&I))
+        AC.registerAssumption(II);
     }
 
   // Update any PHI nodes in the cloned successors of the skipped blocks to not

lib/Transforms/Utils/AssumeBundleBuilder.cpp

@@ -297,7 +297,7 @@ void llvm::salvageKnowledge(Instruction *I, AssumptionCache *AC,
   if (IntrinsicInst *Intr = Builder.build()) {
     Intr->insertBefore(I);
     if (AC)
-      AC->registerAssumption(Intr);
+      AC->registerAssumption(cast<AssumeInst>(Intr));
   }
 }
 
@@ -499,7 +499,7 @@ struct AssumeSimplify {
       return;
     MadeChange = true;
     MergedAssume->insertBefore(InsertPt);
-    AC.registerAssumption(MergedAssume);
+    AC.registerAssumption(cast<AssumeInst>(MergedAssume));
   }
 
   /// Merge assume when they are in the same BasicBlock and for all instruction

lib/Transforms/Utils/CodeExtractor.cpp

@@ -1593,10 +1593,10 @@ CodeExtractor::extractCodeRegion(const CodeExtractorAnalysisCache &CEAC) {
       Instruction *I = &*It;
       ++It;
 
-      if (match(I, m_Intrinsic<Intrinsic::assume>())) {
+      if (auto *AI = dyn_cast<AssumeInst>(I)) {
         if (AC)
-          AC->unregisterAssumption(cast<CallInst>(I));
-        I->eraseFromParent();
+          AC->unregisterAssumption(AI);
+        AI->eraseFromParent();
       }
     }
   }

lib/Transforms/Utils/InlineFunction.cpp

@@ -1296,7 +1296,7 @@ static void AddAlignmentAssumptions(CallBase &CB, InlineFunctionInfo &IFI) {
 
       CallInst *NewAsmp =
           IRBuilder<>(&CB).CreateAlignmentAssumption(DL, ArgVal, Align);
-      AC->registerAssumption(NewAsmp);
+      AC->registerAssumption(cast<AssumeInst>(NewAsmp));
     }
   }
 }
@@ -2050,9 +2050,8 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
       for (BasicBlock &NewBlock :
            make_range(FirstNewBlock->getIterator(), Caller->end()))
         for (Instruction &I : NewBlock)
-          if (auto *II = dyn_cast<IntrinsicInst>(&I))
-            if (II->getIntrinsicID() == Intrinsic::assume)
-              IFI.GetAssumptionCache(*Caller).registerAssumption(II);
+          if (auto *II = dyn_cast<AssumeInst>(&I))
+            IFI.GetAssumptionCache(*Caller).registerAssumption(II);
   }
 
   // If there are any alloca instructions in the block that used to be the entry

lib/Transforms/Utils/LoopRotationUtils.cpp

@@ -467,9 +467,8 @@ bool LoopRotate::rotateLoop(Loop *L, bool SimplifiedLatch) {
         C->setName(Inst->getName());
         C->insertBefore(LoopEntryBranch);
 
-        if (auto *II = dyn_cast<IntrinsicInst>(C))
-          if (II->getIntrinsicID() == Intrinsic::assume)
-            AC->registerAssumption(II);
+        if (auto *II = dyn_cast<AssumeInst>(C))
+          AC->registerAssumption(II);
         // MemorySSA cares whether the cloned instruction was inserted or not, and
         // not whether it can be remapped to a simplified value.
         if (MSSAU)

lib/Transforms/Utils/LoopUnroll.cpp

@@ -681,13 +681,10 @@ LoopUnrollResult llvm::UnrollLoop(Loop *L, UnrollLoopOptions ULO, LoopInfo *LI,
 
     // Remap all instructions in the most recent iteration
     remapInstructionsInBlocks(NewBlocks, LastValueMap);
-    for (BasicBlock *NewBlock : NewBlocks) {
-      for (Instruction &I : *NewBlock) {
-        if (auto *II = dyn_cast<IntrinsicInst>(&I))
-          if (II->getIntrinsicID() == Intrinsic::assume)
-            AC->registerAssumption(II);
-      }
-    }
+    for (BasicBlock *NewBlock : NewBlocks)
+      for (Instruction &I : *NewBlock)
+        if (auto *II = dyn_cast<AssumeInst>(&I))
+          AC->registerAssumption(II);
 
     {
       // Identify what other metadata depends on the cloned version. After

lib/Transforms/Utils/LoopUnrollAndJam.cpp

@@ -432,9 +432,8 @@ llvm::UnrollAndJamLoop(Loop *L, unsigned Count, unsigned TripCount,
     remapInstructionsInBlocks(NewBlocks, LastValueMap);
     for (BasicBlock *NewBlock : NewBlocks) {
       for (Instruction &I : *NewBlock) {
-        if (auto *II = dyn_cast<IntrinsicInst>(&I))
-          if (II->getIntrinsicID() == Intrinsic::assume)
-            AC->registerAssumption(II);
+        if (auto *II = dyn_cast<AssumeInst>(&I))
+          AC->registerAssumption(II);
       }
     }
 

lib/Transforms/Utils/PromoteMemoryToRegister.cpp

@@ -306,7 +306,7 @@ static void addAssumeNonNull(AssumptionCache *AC, LoadInst *LI) {
   LoadNotNull->insertAfter(LI);
   CallInst *CI = CallInst::Create(AssumeIntrinsic, {LoadNotNull});
   CI->insertAfter(LoadNotNull);
-  AC->registerAssumption(CI);
+  AC->registerAssumption(cast<AssumeInst>(CI));
 }
 
 static void removeIntrinsicUsers(AllocaInst *AI) {

lib/Transforms/Utils/SimplifyCFG.cpp

@@ -2530,7 +2530,7 @@ static bool FoldCondBranchOnPHI(BranchInst *BI, DomTreeUpdater *DTU,
 
         // Register the new instruction with the assumption cache if necessary.
         if (AC && match(N, m_Intrinsic<Intrinsic::assume>()))
-          AC->registerAssumption(cast<IntrinsicInst>(N));
+          AC->registerAssumption(cast<AssumeInst>(N));
       }
     }
 

lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -3022,9 +3022,8 @@ void InnerLoopVectorizer::scalarizeInstruction(Instruction *Instr, VPValue *Def,
   State.set(Def, Cloned, Instance);
 
   // If we just cloned a new assumption, add it the assumption cache.
-  if (auto *II = dyn_cast<IntrinsicInst>(Cloned))
-    if (II->getIntrinsicID() == Intrinsic::assume)
-      AC->registerAssumption(II);
+  if (auto *II = dyn_cast<AssumeInst>(Cloned))
+    AC->registerAssumption(II);
 
   // End if-block.
   if (IfPredicateInstr)

unittests/Analysis/AssumeBundleQueriesTest.cpp

@@ -542,7 +542,7 @@ TEST(AssumeQueryAPI, AssumptionCache) {
   ASSERT_EQ(AR.size(), 1u);
   ASSERT_EQ(AR[0].Assume, &*Second);
   ASSERT_EQ(AR[0].Index, AssumptionCache::ExprResultIdx);
-  AC.unregisterAssumption(cast<CallInst>(&*Second));
+  AC.unregisterAssumption(cast<AssumeInst>(&*Second));
   AR = AC.assumptionsFor(F->getArg(1));
   ASSERT_EQ(AR.size(), 0u);
   AR = AC.assumptionsFor(F->getArg(0));