diff --git a/llvm/docs/CommandGuide/llvm-nm.rst b/llvm/docs/CommandGuide/llvm-nm.rst
--- a/llvm/docs/CommandGuide/llvm-nm.rst
+++ b/llvm/docs/CommandGuide/llvm-nm.rst
@@ -126,6 +126,16 @@
 
  Use BSD output format. Alias for ``--format=bsd``.
 
+.. option:: --bit-mode, -X
+
+ Specifies the type of object file llvm-nm should examine. The mode must be one of the following:
+   32
+       Processes only 32-bit object files.
+   64
+       Processes only 64-bit object files.
+   any
+       Processes all of the supported object files.
+
 .. option:: --debug-syms, -a
 
  Show all symbols, even those usually suppressed.
diff --git a/llvm/test/tools/llvm-nm/XCOFF/option-bit-mode.test b/llvm/test/tools/llvm-nm/XCOFF/option-bit-mode.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-nm/XCOFF/option-bit-mode.test
@@ -0,0 +1,77 @@
+## Test the option "--bit-mode" and "-X"  of llvm-nm.
+## The option specifies the type of object file llvm-nm should examine. 
+
+# RUN: yaml2obj  --docnum=1 %s -o %t32.o
+# RUN: yaml2obj  --docnum=2 %s -o %t64.o
+
+# RUN: llvm-nm --bit-mode=32 %t32.o | FileCheck --check-prefixes=BIT32 %s --implicit-check-not={{.}}
+# RUN: llvm-nm -X32 %t32.o | FileCheck --check-prefixes=BIT32 %s --implicit-check-not={{.}}
+# BIT32: 00000000 D var32
+
+# RUN: llvm-nm --bit-mode=64 %t64.o | FileCheck --check-prefixes=BIT64 %s --implicit-check-not={{.}}
+# RUN: llvm-nm -X64 %t64.o | FileCheck --check-prefixes=BIT64 %s --implicit-check-not={{.}}
+# BIT64: 0000000000000000 D var64
+
+# RUN: llvm-nm %t32.o %t64.o | FileCheck --check-prefixes=ANY %s -DFILE32=%t32.o -DFILE64=%t64.o
+# RUN: llvm-nm -Xany %t32.o %t64.o | FileCheck --check-prefixes=ANY %s -DFILE32=%t32.o -DFILE64=%t64.o
+# RUN: llvm-nm --bit-mode=any %t32.o %t64.o | FileCheck --check-prefixes=ANY %s -DFILE32=%t32.o -DFILE64=%t64.o
+
+# ANY:        [[FILE32]]:
+# ANY-NEXT:   00000000 D var32
+# ANY:        [[FILE64]]:
+# ANY-NEXT:   0000000000000000 D var64
+
+# RUN: llvm-nm --bit-mode=64 %t32.o | FileCheck %s --implicit-check-not={{.*}}} --allow-empty
+# RUN: llvm-nm -X64 %t32.o | FileCheck %s --implicit-check-not={{.*}}} --allow-empty
+# RUN: llvm-nm --bit-mode=32 %t32.o | FileCheck %s --implicit-check-not={{.*}}} --allow-empty
+# RUN: llvm-nm -X32 %t32.o | FileCheck %s --implicit-check-not={{.*}}} --allow-empty
+
+
+--- !XCOFF
+FileHeader:
+  MagicNumber:       0x1DF
+  Flags:             0x0002 
+AuxiliaryHeader:
+  Magic:                 0x10B
+  Version:               0x2
+  TextSectionSize:       0x280
+  DataSectionSize:       0x90
+Sections:
+  - Name:            .text
+    Flags:           [ STYP_TEXT ]
+  - Name:            .data
+    Flags:           [ STYP_DATA ]
+Symbols:
+  - Name:            var32
+    Section:         .data
+    Type:            0x4000
+    StorageClass:    C_EXT
+    AuxEntries:
+     - Type:                   AUX_CSECT
+       SymbolAlignmentAndType: 0x09
+       StorageMappingClass:    XMC_RW
+
+
+--- !XCOFF
+FileHeader:
+  MagicNumber:       0x1F7
+  Flags:             0x0002 
+AuxiliaryHeader:
+  Magic:                 0x10B
+  Version:               0x2
+  TextSectionSize:       0x280
+  DataSectionSize:       0x90
+Sections:
+  - Name:            .text
+    Flags:           [ STYP_TEXT ]
+  - Name:            .data
+    Flags:           [ STYP_DATA ]
+Symbols:
+  - Name:            var64
+    Section:         .data
+    Type:            0x3000
+    StorageClass:    C_EXT
+    AuxEntries:
+     - Type:                   AUX_CSECT
+       SymbolAlignmentAndType: 0x09
+       StorageMappingClass:    XMC_RW
diff --git a/llvm/tools/llvm-nm/Opts.td b/llvm/tools/llvm-nm/Opts.td
--- a/llvm/tools/llvm-nm/Opts.td
+++ b/llvm/tools/llvm-nm/Opts.td
@@ -13,6 +13,7 @@
   def : Separate<["--"], name>, Alias<!cast<Joined>(NAME #_EQ)>;
 }
 
+defm bit_mode : Eq<"bit-mode", "Specifies the type of object file llvm-nm should examine. The bit-mode must be one of : 32, 64 ,any(default)">;
 def debug_syms : FF<"debug-syms", "Show all symbols, even debugger only">;
 def defined_only : FF<"defined-only", "Show only defined symbols">;
 defm demangle : BB<"demangle", "Demangle C++ symbol names", "Don't demangle symbol names">;
@@ -81,3 +82,4 @@
 def : F<"v", "Alias for --numeric-sort">, Alias<numeric_sort>;
 def : F<"V", "Alias for --version">, Alias<version>;
 def : F<"W", "Deprecated alias for --no-weak">, Alias<no_weak>, Flags<[HelpHidden]>;
+def : JoinedOrSeparate<["-"], "X">, HelpText<"Alias for --bit-mode">, Alias<bit_mode_EQ>;
diff --git a/llvm/tools/llvm-nm/llvm-nm.cpp b/llvm/tools/llvm-nm/llvm-nm.cpp
--- a/llvm/tools/llvm-nm/llvm-nm.cpp
+++ b/llvm/tools/llvm-nm/llvm-nm.cpp
@@ -85,9 +85,11 @@
 };
 
 enum OutputFormatTy { bsd, sysv, posix, darwin, just_symbols };
+enum BitModeTy { Bit32, Bit64, Any };
 } // namespace
 
 static bool ArchiveMap;
+static BitModeTy BitMode = Any;
 static bool DebugSyms;
 static bool DefinedOnly;
 static bool Demangle;
@@ -1781,9 +1783,17 @@
   }
 }
 
+static bool doesNeedToDump(SymbolicFile &Obj) {
+  if ((isSymbolList64Bit(Obj) && BitMode == Bit32) ||
+      (!isSymbolList64Bit(Obj) && BitMode == Bit64))
+    return false;
+  return true;
+}
 static void dumpSymbolNamesFromObject(SymbolicFile &Obj, bool printName,
                                       StringRef ArchiveName = {},
                                       StringRef ArchitectureName = {}) {
+  if (!doesNeedToDump(Obj))
+    return;
   auto Symbols = Obj.symbols();
   std::vector<VersionEntry> SymbolVersions;
   if (DynamicSyms) {
@@ -2309,6 +2319,18 @@
   else
     error("--format value should be one of: bsd, posix, sysv, darwin, "
           "just-symbols");
+
+  StringRef Mode = Args.getLastArgValue(OPT_bit_mode_EQ, "any");
+  if (Mode == "32")
+    BitMode = Bit32;
+  else if (Mode == "64")
+    BitMode = Bit64;
+  else if (Mode == "any")
+    BitMode = Any;
+  else
+    error(
+        "--bitmode value should be one of: 32,64,any, using default(any) now");
+
   NoLLVMBitcode = Args.hasArg(OPT_no_llvm_bc);
   NoSort = Args.hasArg(OPT_no_sort);
   NoWeakSymbols = Args.hasArg(OPT_no_weak);