diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -426,6 +426,11 @@
       break;
     ++I;
   }
+  // Copy over call site info to the cloned instruction if needed. If Orig is in
+  // a bundle, copyCallSiteInfo takes care of finding the call instruction in
+  // the bundle.
+  if (Orig.shouldUpdateCallSiteInfo())
+    copyCallSiteInfo(&Orig, FirstClone);
   return *FirstClone;
 }
 
diff --git a/llvm/test/CodeGen/X86/taildup-callsiteinfo.mir b/llvm/test/CodeGen/X86/taildup-callsiteinfo.mir
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/X86/taildup-callsiteinfo.mir
@@ -0,0 +1,75 @@
+# RUN: llc %s -emit-call-site-info -run-pass=block-placement -tail-dup-placement-threshold=4 -o - | FileCheck %s
+#
+# Test case adapted from test/CodeGen/X86/taildup-heapallocsite.ll.
+
+# CHECK-LABEL: callSites:
+# CHECK-NEXT:   - { bb: 1, offset: 1, fwdArgRegs:
+# CHECK-NEXT:       - { arg: 0, reg: '$rcx' } }
+# CHECK-NEXT:   - { bb: 2, offset: 1, fwdArgRegs:
+# CHECK-NEXT:       - { arg: 0, reg: '$rcx' } }
+
+--- |
+  target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+  target triple = "x86_64-pc-windows-msvc19.22.27905"
+
+  define dso_local void @taildupit(i32* readonly %size_ptr) {
+  entry:
+    %tobool = icmp eq i32* %size_ptr, null
+    br i1 %tobool, label %cond.end, label %cond.true
+
+  cond.true:                                        ; preds = %entry
+    %0 = load i32, i32* %size_ptr, align 4
+    br label %cond.end
+
+  cond.end:                                         ; preds = %cond.true, %entry
+    %cond = phi i32 [ %0, %cond.true ], [ 1, %entry ]
+    %call = tail call i8* @alloc(i32 %cond)
+    tail call void @f2()
+    ret void
+  }
+
+  declare dso_local i8* @alloc(i32)
+
+  declare dso_local void @f2()
+
+...
+---
+name:            taildupit
+tracksRegLiveness: true
+liveins:
+  - { reg: '$rcx', virtual-reg: '' }
+callSites:
+  - { bb: 3, offset: 0, fwdArgRegs:
+      - { arg: 0, reg: '$rcx' } }
+body:             |
+  bb.0.entry:
+    successors: %bb.1(0x30000000), %bb.2(0x50000000)
+    liveins: $rcx
+
+    $rsp = frame-setup SUB64ri8 $rsp, 40, implicit-def dead $eflags
+    frame-setup SEH_StackAlloc 40
+    frame-setup SEH_EndPrologue
+    TEST64rr renamable $rcx, renamable $rcx, implicit-def $eflags
+    JCC_1 %bb.2, 5, implicit killed $eflags
+
+  bb.1:
+    successors: %bb.3(0x80000000)
+
+    renamable $ecx = MOV32ri 1
+    JMP_1 %bb.3
+
+  bb.2.cond.true:
+    successors: %bb.3(0x80000000)
+    liveins: $rcx
+
+    renamable $ecx = MOV32rm killed renamable $rcx, 1, $noreg, 0, $noreg :: (load 4 from %ir.size_ptr)
+
+  bb.3.cond.end:
+    liveins: $ecx
+
+    CALL64pcrel32 @alloc, csr_win64, implicit $rsp, implicit $ssp, implicit $ecx, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+    SEH_Epilogue
+    $rsp = frame-destroy ADD64ri8 $rsp, 40, implicit-def dead $eflags
+    TAILJMPd64 @f2, csr_win64, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp
+
+...
diff --git a/llvm/unittests/CodeGen/MFCommon.inc b/llvm/unittests/CodeGen/MFCommon.inc
--- a/llvm/unittests/CodeGen/MFCommon.inc
+++ b/llvm/unittests/CodeGen/MFCommon.inc
@@ -92,11 +92,18 @@
   TargetInstrInfo TII;
 };
 
+static TargetOptions getTargetOptionsForBogusMachine() {
+  TargetOptions Opts;
+  Opts.EmitCallSiteInfo = true;
+  return Opts;
+}
+
 class BogusTargetMachine : public LLVMTargetMachine {
 public:
   BogusTargetMachine()
-      : LLVMTargetMachine(Target(), "", Triple(""), "", "", TargetOptions(),
-                          Reloc::Static, CodeModel::Small, CodeGenOpt::Default),
+      : LLVMTargetMachine(Target(), "", Triple(""), "", "",
+                          getTargetOptionsForBogusMachine(), Reloc::Static,
+                          CodeModel::Small, CodeGenOpt::Default),
         ST(*this) {}
 
   ~BogusTargetMachine() override {}
diff --git a/llvm/unittests/CodeGen/MachineInstrTest.cpp b/llvm/unittests/CodeGen/MachineInstrTest.cpp
--- a/llvm/unittests/CodeGen/MachineInstrTest.cpp
+++ b/llvm/unittests/CodeGen/MachineInstrTest.cpp
@@ -383,6 +383,26 @@
   ASSERT_FALSE(MI->getHeapAllocMarker());
 }
 
+TEST(MachineInstrClone, CopyCallSiteInfo) {
+  LLVMContext Ctx;
+  Module Mod("Module", Ctx);
+  auto MF = createMachineFunction(Ctx, Mod);
+  auto MBB = MF->CreateMachineBasicBlock();
+  auto MII = MBB->begin();
+
+  MCInstrDesc MCID = {0, 0,       0,       0,      0, (1ULL << MCID::Call),
+                      0, nullptr, nullptr, nullptr};
+
+  MachineFunction::CallSiteInfo CSInfo;
+  auto MI = MF->CreateMachineInstr(MCID, DebugLoc());
+  ASSERT_TRUE(MI->isCandidateForCallSiteEntry());
+  MBB->insert(MII, MI);
+  MF->addCallArgsForwardingRegs(MI, std::move(CSInfo));
+  EXPECT_EQ(MF->getCallSitesInfo().size(), 1u);
+  MF->CloneMachineInstrBundle(*MBB, MBB->end(), *MI);
+  EXPECT_EQ(MF->getCallSitesInfo().size(), 2u);
+}
+
 static_assert(is_trivially_copyable<MCOperand>::value, "trivially copyable");
 
 } // end namespace