Index: lib/CodeGen/CodeGenPrepare.cpp
===================================================================
--- lib/CodeGen/CodeGenPrepare.cpp
+++ lib/CodeGen/CodeGenPrepare.cpp
@@ -4475,6 +4475,26 @@
   if (!Cmp || !Cmp->hasOneUse())
     return false;
 
+  // If both operand of the select is expected to fold away in lowering,
+  // the mispredicted branch might be more painful.
+  auto IsFreeCostInst = [&](Value *V) -> bool {
+    auto *I = dyn_cast<Instruction>(V);
+    if (I == nullptr)
+      return false;
+
+    if (TTI->getUserCost(I) == TargetTransformInfo::TCC_Free) {
+      for (const Use &U : I->operands()) {
+        const Value *OpVal = U.get();
+        if (!(dyn_cast<Argument>(OpVal) || dyn_cast<PHINode>(OpVal) ||
+              dyn_cast<Constant>(OpVal)))
+          return false;
+      }
+    }
+    return true;
+  };
+  if (IsFreeCostInst(SI->getTrueValue()) && IsFreeCostInst(SI->getFalseValue()))
+    return false;
+
   Value *CmpOp0 = Cmp->getOperand(0);
   Value *CmpOp1 = Cmp->getOperand(1);
 
Index: test/CodeGen/AArch64/arm64-select.ll
===================================================================
--- /dev/null
+++ test/CodeGen/AArch64/arm64-select.ll
@@ -0,0 +1,26 @@
+; RUN: llc -march=arm64 -mcpu=cortex-a57 < %s | FileCheck %s
+; We don't transform below case which has cheap operands of select.
+
+target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-gnu"
+
+%class.A = type { i32, i32, i32, i32 }
+
+define i32 @test(%class.A* nocapture readonly %cla, float* nocapture readonly %b, i32 %c) #0 {
+entry:
+; CHECK-LABEL: test:
+; CHECK: csel
+  %call = tail call fast float @_Z6getvalv()
+  %0 = load float, float* %b, align 4, !tbaa !0
+  %cmp = fcmp fast olt float %call, %0
+  %a1 = getelementptr inbounds %class.A, %class.A* %cla, i64 0, i32 1
+  %a2 = getelementptr inbounds %class.A, %class.A* %cla, i64 0, i32 2
+  %cond.in = select i1 %cmp, i32* %a1, i32* %a2
+  %cond = load i32, i32* %cond.in, align 4, !tbaa !0
+  ret i32 %cond
+}
+
+declare float @_Z6getvalv() #0
+
+!0 = !{!1, !1, i64 0}
+!1 = distinct !{!"int", !1, i64 0}
\ No newline at end of file