Index: include/llvm/Analysis/ScalarEvolution.h
===================================================================
--- include/llvm/Analysis/ScalarEvolution.h
+++ include/llvm/Analysis/ScalarEvolution.h
@@ -1375,6 +1375,9 @@
   /// Provide the special handling we need to analyze PHI SCEVs.
   const SCEV *createNodeForPHI(PHINode *PN);
 
+  /// Evaluate ICmpInst to a constant node for special patterns. 
+  const SCEV *evaluateForICmp(ICmpInst *IC);
+
   /// Helper function called from createNodeForPHI.
   const SCEV *createAddRecFromPHI(PHINode *PN);
 
Index: lib/Analysis/ScalarEvolution.cpp
===================================================================
--- lib/Analysis/ScalarEvolution.cpp
+++ lib/Analysis/ScalarEvolution.cpp
@@ -4987,6 +4987,29 @@
   return getUnknown(PN);
 }
 
+const SCEV *ScalarEvolution::evaluateForICmp(ICmpInst *IC) {
+  BasicBlock *Latch = nullptr;
+  const Loop *L = LI.getLoopFor(IC->getParent());
+
+  // If compare instruction is same or inverse of the compare in the
+  // branch of the loop latch, then return a constant evolution
+  // node. This shall facilitate computations of loop exit counts
+  // in cases where compare appears in the evolution chain of induction
+  // variables.
+  if (L && (Latch = L->getLoopLatch())) {
+    BranchInst *BI = dyn_cast<BranchInst>(Latch->getTerminator());
+    if (BI && BI->isConditional() && BI->getCondition() == IC) {
+      if (BI->getSuccessor(0) != L->getHeader())
+        return getConstant(Type::getInt1Ty(getContext()), 0, false);
+      else
+        return getConstant(Type::getInt1Ty(getContext()), 1, false);
+    }
+  }
+
+  return getUnknown(IC);
+}
+
+
 const SCEV *ScalarEvolution::createNodeForSelectOrPHI(Instruction *I,
                                                       Value *Cond,
                                                       Value *TrueVal,
@@ -6105,6 +6128,11 @@
   case Instruction::PHI:
     return createNodeForPHI(cast<PHINode>(U));
 
+  case Instruction::ICmp:
+    if (isa<Instruction>(U))
+      return evaluateForICmp(cast<ICmpInst>(U));
+    break;
+
   case Instruction::Select:
     // U can also be a select constant expr, which let fall through.  Since
     // createNodeForSelect only works for a condition that is an `ICmpInst`, and
Index: lib/Transforms/Scalar/LoopStrengthReduce.cpp
===================================================================
--- lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -2973,8 +2973,11 @@
       // Ignore users that are part of a SCEV expression. This way we only
       // consider leaf IV Users. This effectively rediscovers a portion of
       // IVUsers analysis but in program order this time.
-      if (SE.isSCEVable(I.getType()) && !isa<SCEVUnknown>(SE.getSCEV(&I)))
-        continue;
+      if (SE.isSCEVable(I.getType())) {
+        const SCEV *SI = SE.getSCEV(&I);
+        if (!isa<SCEVUnknown>(SI) && !isa<SCEVConstant>(SI))
+          continue;
+      }
 
       // Remove this instruction from any NearUsers set it may be in.
       for (unsigned ChainIdx = 0, NChains = IVChainVec.size();
Index: test/Analysis/ScalarEvolution/pr34538.ll
===================================================================
--- /dev/null
+++ test/Analysis/ScalarEvolution/pr34538.ll
@@ -0,0 +1,19 @@
+; RUN: opt -S -scalar-evolution -loop-deletion -simplifycfg -analyze < %s | FileCheck %s --check-prefix=CHECK-ANALYSIS
+
+define i32 @foo() local_unnamed_addr #0 {
+; CHECK-ANALYSIS: Loop %do.body: backedge-taken count is 10000
+; CHECK-ANALYSIS: Loop %do.body: max backedge-taken count is 10000
+; CHECK-ANALYSIS: Loop %do.body: Predicated backedge-taken count is 10000
+entry:
+  br label %do.body
+
+do.body:                                          ; preds = %do.body, %entry
+  %start.0 = phi i32 [ 0, %entry ], [ %inc.start.0, %do.body ]
+  %cmp = icmp slt i32 %start.0, 10000
+  %inc = zext i1 %cmp to i32
+  %inc.start.0 = add nsw i32 %start.0, %inc
+  br i1 %cmp, label %do.body, label %do.end
+
+do.end:                                           ; preds = %do.body
+  ret i32 0
+}