Merge llvm-project main llvmorg-15-init-15358-g53dc0f10787

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-15358-g53dc0f10787.

PR:		265425
MFC after:	2 weeks

1 files changed, 47 insertions, 30 deletions

diff --git a/contrib/llvm-project/llvm/lib/Transforms/Utils/Local.cpp b/contrib/llvm-project/llvm/lib/Transforms/Utils/Local.cpp
index 1c350a2585d0..b203259db1c6 100644
--- a/contrib/llvm-project/llvm/lib/Transforms/Utils/Local.cpp
+++ b/contrib/llvm-project/llvm/lib/Transforms/Utils/Local.cpp
@@ -29,7 +29,6 @@
 #include "llvm/Analysis/DomTreeUpdater.h"
 #include "llvm/Analysis/EHPersonalities.h"
 #include "llvm/Analysis/InstructionSimplify.h"
-#include "llvm/Analysis/LazyValueInfo.h"
 #include "llvm/Analysis/MemoryBuiltins.h"
 #include "llvm/Analysis/MemorySSAUpdater.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
@@ -63,9 +62,7 @@
 #include "llvm/IR/MDBuilder.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Module.h"
-#include "llvm/IR/Operator.h"
 #include "llvm/IR/PatternMatch.h"
-#include "llvm/IR/PseudoProbe.h"
 #include "llvm/IR/Type.h"
 #include "llvm/IR/Use.h"
 #include "llvm/IR/User.h"
@@ -80,7 +77,6 @@
 #include "llvm/Transforms/Utils/ValueMapper.h"
 #include <algorithm>
 #include <cassert>
-#include <climits>
 #include <cstdint>
 #include <iterator>
 #include <map>
@@ -489,7 +485,7 @@ bool llvm::wouldInstructionBeTriviallyDead(Instruction *I,
 
     if (auto *FPI = dyn_cast<ConstrainedFPIntrinsic>(I)) {
       Optional<fp::ExceptionBehavior> ExBehavior = FPI->getExceptionBehavior();
-      return ExBehavior.getValue() != fp::ebStrict;
+      return *ExBehavior != fp::ebStrict;
     }
   }
 
@@ -504,15 +500,12 @@ bool llvm::wouldInstructionBeTriviallyDead(Instruction *I,
     if (isMathLibCallNoop(Call, TLI))
       return true;
 
-  // To express possible interaction with floating point environment constrained
-  // intrinsics are described as if they access memory. So they look like having
-  // side effect but actually do not have it unless they raise floating point
-  // exception. If FP exceptions are ignored, the intrinsic may be deleted.
-  if (auto *CI = dyn_cast<ConstrainedFPIntrinsic>(I)) {
-    Optional<fp::ExceptionBehavior> EB = CI->getExceptionBehavior();
-    if (!EB || *EB == fp::ExceptionBehavior::ebIgnore)
-      return true;
-  }
+  // Non-volatile atomic loads from constants can be removed.
+  if (auto *LI = dyn_cast<LoadInst>(I))
+    if (auto *GV = dyn_cast<GlobalVariable>(
+            LI->getPointerOperand()->stripPointerCasts()))
+      if (!LI->isVolatile() && GV->isConstant())
+        return true;
 
   return false;
 }
@@ -682,7 +675,7 @@ simplifyAndDCEInstruction(Instruction *I,
     return true;
   }
 
-  if (Value *SimpleV = SimplifyInstruction(I, DL)) {
+  if (Value *SimpleV = simplifyInstruction(I, DL)) {
     // Add the users to the worklist. CAREFUL: an instruction can use itself,
     // in the case of a phi node.
     for (User *U : I->users()) {
@@ -1133,7 +1126,7 @@ bool llvm::TryToSimplifyUncondBranchFromEmptyBlock(BasicBlock *BB,
     // If there is more than one pred of succ, and there are PHI nodes in
     // the successor, then we need to add incoming edges for the PHI nodes
     //
-    const PredBlockVector BBPreds(pred_begin(BB), pred_end(BB));
+    const PredBlockVector BBPreds(predecessors(BB));
 
     // Loop over all of the PHI nodes in the successor of BB.
     for (BasicBlock::iterator I = Succ->begin(); isa<PHINode>(I); ++I) {
@@ -1393,7 +1386,7 @@ Align llvm::getOrEnforceKnownAlignment(Value *V, MaybeAlign PrefAlign,
 static bool PhiHasDebugValue(DILocalVariable *DIVar,
                              DIExpression *DIExpr,
                              PHINode *APN) {
-  // Since we can't guarantee that the original dbg.declare instrinsic
+  // Since we can't guarantee that the original dbg.declare intrinsic
   // is removed by LowerDbgDeclare(), we need to make sure that we are
   // not inserting the same dbg.value intrinsic over and over.
   SmallVector<DbgValueInst *, 1> DbgValues;
@@ -1472,7 +1465,7 @@ void llvm::ConvertDebugDeclareToDebugValue(DbgVariableIntrinsic *DII,
     LLVM_DEBUG(dbgs() << "Failed to convert dbg.declare to dbg.value: "
                       << *DII << '\n');
     // For now, when there is a store to parts of the variable (but we do not
-    // know which part) we insert an dbg.value instrinsic to indicate that we
+    // know which part) we insert an dbg.value intrinsic to indicate that we
     // know nothing about the variable's content.
     DV = UndefValue::get(DV->getType());
     Builder.insertDbgValueIntrinsic(DV, DIVar, DIExpr, NewLoc, SI);
@@ -2240,6 +2233,7 @@ BasicBlock *llvm::changeToInvokeAndSplitBasicBlock(CallInst *CI,
   II->setDebugLoc(CI->getDebugLoc());
   II->setCallingConv(CI->getCallingConv());
   II->setAttributes(CI->getAttributes());
+  II->setMetadata(LLVMContext::MD_prof, CI->getMetadata(LLVMContext::MD_prof));
 
   if (DTU)
     DTU->applyUpdates({{DominatorTree::Insert, BB, UnwindEdge}});
@@ -2349,19 +2343,42 @@ static bool markAliveBlocks(Function &F,
           isa<UndefValue>(Callee)) {
         changeToUnreachable(II, false, DTU);
         Changed = true;
-      } else if (II->doesNotThrow() && canSimplifyInvokeNoUnwind(&F)) {
-        if (II->use_empty() && !II->mayHaveSideEffects()) {
-          // jump to the normal destination branch.
-          BasicBlock *NormalDestBB = II->getNormalDest();
-          BasicBlock *UnwindDestBB = II->getUnwindDest();
-          BranchInst::Create(NormalDestBB, II);
-          UnwindDestBB->removePredecessor(II->getParent());
-          II->eraseFromParent();
+      } else {
+        if (II->doesNotReturn() &&
+            !isa<UnreachableInst>(II->getNormalDest()->front())) {
+          // If we found an invoke of a no-return function,
+          // create a new empty basic block with an `unreachable` terminator,
+          // and set it as the normal destination for the invoke,
+          // unless that is already the case.
+          // Note that the original normal destination could have other uses.
+          BasicBlock *OrigNormalDest = II->getNormalDest();
+          OrigNormalDest->removePredecessor(II->getParent());
+          LLVMContext &Ctx = II->getContext();
+          BasicBlock *UnreachableNormalDest = BasicBlock::Create(
+              Ctx, OrigNormalDest->getName() + ".unreachable",
+              II->getFunction(), OrigNormalDest);
+          new UnreachableInst(Ctx, UnreachableNormalDest);
+          II->setNormalDest(UnreachableNormalDest);
           if (DTU)
-            DTU->applyUpdates({{DominatorTree::Delete, BB, UnwindDestBB}});
-        } else
-          changeToCall(II, DTU);
-        Changed = true;
+            DTU->applyUpdates(
+                {{DominatorTree::Delete, BB, OrigNormalDest},
+                 {DominatorTree::Insert, BB, UnreachableNormalDest}});
+          Changed = true;
+        }
+        if (II->doesNotThrow() && canSimplifyInvokeNoUnwind(&F)) {
+          if (II->use_empty() && !II->mayHaveSideEffects()) {
+            // jump to the normal destination branch.
+            BasicBlock *NormalDestBB = II->getNormalDest();
+            BasicBlock *UnwindDestBB = II->getUnwindDest();
+            BranchInst::Create(NormalDestBB, II);
+            UnwindDestBB->removePredecessor(II->getParent());
+            II->eraseFromParent();
+            if (DTU)
+              DTU->applyUpdates({{DominatorTree::Delete, BB, UnwindDestBB}});
+          } else
+            changeToCall(II, DTU);
+          Changed = true;
+        }
       }
     } else if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(Terminator)) {
       // Remove catchpads which cannot be reached.