diff --git a/llvm/include/llvm/MC/MCDisassembler/MCDisassembler.h b/llvm/include/llvm/MC/MCDisassembler/MCDisassembler.h
--- a/llvm/include/llvm/MC/MCDisassembler/MCDisassembler.h
+++ b/llvm/include/llvm/MC/MCDisassembler/MCDisassembler.h
@@ -26,6 +26,8 @@
   XCOFFSymbolInfo(Optional<XCOFF::StorageMappingClass> Smc,
                   Optional<uint32_t> Idx, bool Label)
       : StorageMappingClass(Smc), Index(Idx), IsLabel(Label) {}
+
+  bool operator<(const XCOFFSymbolInfo &SymInfo) const;
 };
 
 struct SymbolInfoTy {
@@ -53,9 +55,10 @@
     assert(P1.IsXCOFF == P2.IsXCOFF &&
            "P1.IsXCOFF should be equal to P2.IsXCOFF.");
     if (P1.IsXCOFF)
-      return std::tie(P1.Addr, P1.Name) < std::tie(P2.Addr, P2.Name);
-    else
-      return std::tie(P1.Addr, P1.Name, P1.Type) <
+      return std::tie(P1.Addr, P1.XCOFFSymInfo, P1.Name) <
+             std::tie(P2.Addr, P2.XCOFFSymInfo, P2.Name);
+
+    return std::tie(P1.Addr, P1.Name, P1.Type) <
              std::tie(P2.Addr, P2.Name, P2.Type);
   }
 };
diff --git a/llvm/lib/MC/MCDisassembler/MCDisassembler.cpp b/llvm/lib/MC/MCDisassembler/MCDisassembler.cpp
--- a/llvm/lib/MC/MCDisassembler/MCDisassembler.cpp
+++ b/llvm/lib/MC/MCDisassembler/MCDisassembler.cpp
@@ -43,3 +43,56 @@
 void MCDisassembler::setSymbolizer(std::unique_ptr<MCSymbolizer> Symzer) {
   Symbolizer = std::move(Symzer);
 }
+
+#define SMC_PCASE(A, P)                                                         \
+  case XCOFF::XMC_##A:                                                         \
+    return P;
+
+uint8_t getSMCPriority(XCOFF::StorageMappingClass SMC) {
+  switch (SMC) {
+    SMC_PCASE(PR, 1)
+    SMC_PCASE(RO, 1)
+    SMC_PCASE(DB, 1)
+    SMC_PCASE(GL, 1)
+    SMC_PCASE(XO, 1)
+    SMC_PCASE(SV, 1)
+    SMC_PCASE(SV64, 1)
+    SMC_PCASE(SV3264, 1)
+    SMC_PCASE(TI, 1)
+    SMC_PCASE(TB, 1)
+    SMC_PCASE(RW, 1)
+    SMC_PCASE(TC0, 0)
+    SMC_PCASE(TC, 1)
+    SMC_PCASE(TD, 1)
+    SMC_PCASE(DS, 1)
+    SMC_PCASE(UA, 1)
+    SMC_PCASE(BS, 1)
+    SMC_PCASE(UC, 1)
+    SMC_PCASE(TL, 1)
+    SMC_PCASE(UL, 1)
+    SMC_PCASE(TE, 1)
+#undef SMC_PCASE
+  }
+  return 0;
+}
+
+/// The function is for symbol sorting when symbols have the same address.
+/// The symbols in the same section are sorted in ascending order.
+/// llvm-objdump -D will choose the highest priority symbol to display when
+/// there are symbols with the same address.
+
+bool XCOFFSymbolInfo::operator<(const XCOFFSymbolInfo &SymInfo) const {
+  // Label symbols have higher priorty than non-label symbols.
+  if (IsLabel != SymInfo.IsLabel)
+    return SymInfo.IsLabel;
+
+  // Symbols with a StorageMappingClass have higher priority than those without.
+  if (!SymInfo.StorageMappingClass)
+    return false;
+
+  if (!StorageMappingClass)
+    return true;
+
+  return getSMCPriority(StorageMappingClass.getValue()) <
+         getSMCPriority(SymInfo.StorageMappingClass.getValue());
+}
diff --git a/llvm/test/tools/llvm-objdump/XCOFF/disassemble-symbol-description.test b/llvm/test/tools/llvm-objdump/XCOFF/disassemble-symbol-description.test
--- a/llvm/test/tools/llvm-objdump/XCOFF/disassemble-symbol-description.test
+++ b/llvm/test/tools/llvm-objdump/XCOFF/disassemble-symbol-description.test
@@ -22,7 +22,7 @@
 COMMON: Inputs/xcoff-section-headers.o:	file format aixcoff-rs6000
 COMMON: Disassembly of section .text:
 PLAIN:      00000000 <.text>:
-DESC:       00000000 (idx: 4) .text:
+DESC:       00000000 (idx: 16) .func: 
 COMMON-NEXT:        0: 80 62 00 04                  	lwz 3, 4(2)
 COMMON-NEXT:        4: 80 63 00 00                  	lwz 3, 0(3)
 COMMON-NEXT:        8: 4e 80 00 20                  	blr
diff --git a/llvm/unittests/MC/CMakeLists.txt b/llvm/unittests/MC/CMakeLists.txt
--- a/llvm/unittests/MC/CMakeLists.txt
+++ b/llvm/unittests/MC/CMakeLists.txt
@@ -17,5 +17,6 @@
   MCInstPrinter.cpp
   StringTableBuilderTest.cpp
   TargetRegistry.cpp
+  MCDisassemblerTest.cpp
   )
 
diff --git a/llvm/unittests/MC/MCDisassemblerTest.cpp b/llvm/unittests/MC/MCDisassemblerTest.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/unittests/MC/MCDisassemblerTest.cpp
@@ -0,0 +1,50 @@
+//===- MCDisassemblerTest.cpp - Tests for MCDisassembler.cpp --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCDisassembler/MCDisassembler.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(MCDisassembler, XCOFFSymbolPriorityTest) {
+  Optional<XCOFF::StorageMappingClass> SMC_None(None);
+  Optional<XCOFF::StorageMappingClass> SMC_TC0(XCOFF::XMC_TC0);
+  Optional<XCOFF::StorageMappingClass> SMC_TC(XCOFF::XMC_TC);
+
+  SymbolInfoTy SIT1(0x100000, "sym1", SMC_None, 1, false);
+  SymbolInfoTy SIT2(0x110000, "sym2", SMC_None, 2, false);
+  SymbolInfoTy SIT3(0x110000, "sym3", SMC_None, 3, true);
+  SymbolInfoTy SIT4(0x110000, "sym4", SMC_TC0, 4, false);
+  SymbolInfoTy SIT5(0x110000, "sym5", SMC_TC, 5, false);
+
+  // Test symbol with higher address has higher priority than those with lower
+  // address.
+  EXPECT_LT(SIT1, SIT2);
+  EXPECT_FALSE(SIT2 < SIT1);
+
+  // Test symbol with a StorageMappingClass have higher priority than those
+  // without.
+  EXPECT_LT(SIT2, SIT4);
+  EXPECT_FALSE(SIT4 < SIT2);
+
+  // Test symbol with a TC0 StorageMappingClass has lower priority that those
+  // with other StorageMappingClass.
+  EXPECT_LT(SIT4, SIT5);
+  EXPECT_FALSE(SIT5 < SIT4);
+
+  // Test label symbols have higher priorty than non-label symbols.
+  EXPECT_LT(SIT5, SIT3);
+  EXPECT_FALSE(SIT3 < SIT5);
+
+  // Test symbols compare with itself.
+  EXPECT_FALSE(SIT1 < SIT1);
+  EXPECT_FALSE(SIT2 < SIT2);
+  EXPECT_FALSE(SIT3 < SIT3);
+  EXPECT_FALSE(SIT4 < SIT4);
+  EXPECT_FALSE(SIT5 < SIT5);
+}