Index: llvm/test/tools/llvm-objdump/ARM/mnemonic-hist0.test
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-objdump/ARM/mnemonic-hist0.test
@@ -0,0 +1,10 @@
+#RUN: llvm-mc -filetype=obj -triple=thumbv7 %s -o - | \
+#RUN: llvm-objdump --triple=thumbv7 -d --mnemonic-hist - | FileCheck %s
+
+        .text
+        .thumb
+foo:
+
+#CHECK: Mnemonic histogram:{{[[:space:]]}}
+#CHECK: {{[[:space:]]}}
+#CHECK-NOT: {{.*}}:
Index: llvm/test/tools/llvm-objdump/ARM/mnemonic-hist1.test
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-objdump/ARM/mnemonic-hist1.test
@@ -0,0 +1,17 @@
+#RUN: llvm-mc -filetype=obj -triple=thumbv7 %s -o - | \
+#RUN: llvm-objdump --triple=thumbv7 -d --mnemonic-hist - | FileCheck %s
+
+        .syntax unified
+        .text
+        .thumb
+
+foo:
+        add r0,r1,r2
+        sub r2,r1,r3
+        add r4,r0,r2
+        mul r5,r4,r1
+
+#CHECK:Mnemonic histogram:
+#CHECK: add: 2 (50%)
+#CHECK: mul: 1 (25%)
+#CHECK: sub: 1 (25%)
Index: llvm/tools/llvm-objdump/ObjdumpOpts.td
===================================================================
--- llvm/tools/llvm-objdump/ObjdumpOpts.td
+++ llvm/tools/llvm-objdump/ObjdumpOpts.td
@@ -174,6 +174,9 @@
 def symbolize_operands : Flag<["--"], "symbolize-operands">,
   HelpText<"Symbolize instruction operands when disassembling">;
 
+def mnemonic_hist: Flag<["--"], "mnemonic-hist">,
+  HelpText<"Display a histogram of all mnemonics">;
+
 def dynamic_syms : Flag<["--"], "dynamic-syms">,
   HelpText<"Display the contents of the dynamic symbol table">;
 def : Flag<["-"], "T">, Alias<dynamic_syms>,
Index: llvm/tools/llvm-objdump/llvm-objdump.cpp
===================================================================
--- llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -213,6 +213,9 @@
 
 bool objdump::SymbolTable;
 static bool SymbolizeOperands;
+static bool MnemonicHistogram;
+std::map<std::string, unsigned> Hist;
+
 static bool DynamicSymbolTable;
 std::string objdump::TripleName;
 bool objdump::UnwindInfo;
@@ -1482,6 +1485,13 @@
               {SectionAddr + Index + VMAAdjustment, Section.getIndex()}, FOS,
               "", *STI, &SP, Obj->getFileName(), &Rels, LVP);
 
+          if (Disassembled && MnemonicHistogram) {
+            const char *Mnemonic;
+            int Bytes;
+            std::tie(Mnemonic, Bytes) = IP->getMnemonic(&Inst);
+            Hist[Mnemonic]++;
+          }
+
           IP->setCommentStream(llvm::nulls());
 
           // If disassembly has failed, avoid analysing invalid/incomplete
@@ -2153,6 +2163,36 @@
   outs() << ' ' << SymName << '\n';
 }
 
+static void printMnemonicHistogram(const ObjectFile *O) {
+  std::vector<std::pair<std::string, unsigned>> List;
+  for (auto &I : Hist)
+    List.push_back(I);
+
+  std::sort(List.begin(), List.end(), [] (std::pair<std::string, unsigned> &L,
+                                          std::pair<std::string, unsigned> &R) {
+                                            return L.second > R.second; });
+
+  unsigned Total = 0;
+  unsigned MaxStrLen = 0;
+  for (auto &I : List) {
+    Total += I.second;
+    MaxStrLen = I.first.length() > MaxStrLen ? I.first.length() : MaxStrLen;
+  }
+
+  unsigned MaxDigits = List.empty() ? 0 :
+      unsigned(std::log10(List.front().second) + 1);
+ 
+  outs() << "\nMnemonic histogram:\n\n";
+  for (auto &I : List) {
+    outs() << format("%*s", MaxStrLen + 1, I.first.c_str());
+    outs() << ":";
+    outs() << format("%*d", MaxDigits + 1, I.second);
+    outs() << " (";
+    outs() << format("%g", ((float)I.second / (float)Total) * 100);
+    outs() << "%)\n";
+  }
+}
+
 static void printUnwindInfo(const ObjectFile *O) {
   outs() << "Unwind info:\n\n";
 
@@ -2412,6 +2452,8 @@
     printSectionContents(O);
   if (Disassemble)
     disassembleObject(O, Relocations);
+  if (MnemonicHistogram)
+    printMnemonicHistogram(O);
   if (UnwindInfo)
     printUnwindInfo(O);
 
@@ -2622,6 +2664,7 @@
   HasStopAddressFlag = InputArgs.hasArg(OBJDUMP_stop_address_EQ);
   SymbolTable = InputArgs.hasArg(OBJDUMP_syms);
   SymbolizeOperands = InputArgs.hasArg(OBJDUMP_symbolize_operands);
+  MnemonicHistogram = InputArgs.hasArg(OBJDUMP_mnemonic_hist);
   DynamicSymbolTable = InputArgs.hasArg(OBJDUMP_dynamic_syms);
   TripleName = InputArgs.getLastArgValue(OBJDUMP_triple_EQ).str();
   UnwindInfo = InputArgs.hasArg(OBJDUMP_unwind_info);