diff --git a/llvm/include/llvm/MC/MCContext.h b/llvm/include/llvm/MC/MCContext.h
--- a/llvm/include/llvm/MC/MCContext.h
+++ b/llvm/include/llvm/MC/MCContext.h
@@ -10,6 +10,7 @@
 #define LLVM_MC_MCCONTEXT_H
 
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallString.h"
@@ -100,6 +101,10 @@
     /// Bindings of names to symbols.
     SymbolTable Symbols;
 
+    /// llvm extern intrinsic xcoff symbols used for emiting these symbol's
+    /// linkage.
+    DenseSet<MCSymbol *> XCOFFIntrinsicSymbols;
+
     /// A mapping from a local label number and an instance count to a symbol.
     /// For example, in the assembly
     ///     1:
@@ -414,6 +419,11 @@
     /// Get the symbol for \p Name, or null.
     MCSymbol *lookupSymbol(const Twine &Name) const;
 
+    /// Get XCOFF Intrinsic entern symbols DenseSet.
+    DenseSet<MCSymbol *> &getXCOFFIntrinsicExternSymbol() {
+      return XCOFFIntrinsicSymbols;
+    }
+
     /// Set value for a symbol.
     void setSymbolValue(MCStreamer &Streamer, StringRef Sym, uint64_t Val);
 
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -20,6 +20,7 @@
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallString.h"
@@ -1528,6 +1529,12 @@
     emitVisibility(Name, V, false);
   }
 
+  // Emit linkage for llvm intrinsic function entry point symbol.
+  if (TM.getTargetTriple().isOSBinFormatXCOFF()) {
+    for (auto Sym : OutContext.getXCOFFIntrinsicExternSymbol()) {
+      OutStreamer->emitSymbolAttribute(Sym, MCSA_Extern);
+    }
+  }
   // Emit the remarks section contents.
   // FIXME: Figure out when is the safest time to emit this section. It should
   // not come after debug info.
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -26,6 +26,7 @@
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
@@ -5270,7 +5271,10 @@
       return getAIXFuncEntryPointSymbolSDNode(F->getName(), F->isDeclaration(),
                                               SC);
     }
-
+    auto &Context = DAG.getMachineFunction().getMMI().getContext();
+    MCSymbolXCOFF *Sym = cast<MCSymbolXCOFF>(
+        Context.getOrCreateSymbol(Twine(".") + Twine(SymName)));
+    Context.getXCOFFIntrinsicExternSymbol().insert(Sym);
     return getAIXFuncEntryPointSymbolSDNode(SymName, true, XCOFF::C_EXT);
   }
 
diff --git a/llvm/test/CodeGen/PowerPC/aix-llvm-intrinsic.ll b/llvm/test/CodeGen/PowerPC/aix-llvm-intrinsic.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/aix-llvm-intrinsic.ll
@@ -0,0 +1,194 @@
+; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -mcpu=pwr4 \
+; RUN: -mattr=-altivec < %s | FileCheck --check-prefixes=COMMON,BIT32 %s
+
+; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff -mcpu=pwr4 \
+; RUN: -mattr=-altivec < %s | FileCheck --check-prefixes=COMMON,BIT64 %s
+
+; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -mcpu=pwr4 \
+; RUN: -mattr=-altivec -filetype=obj -o %t.o < %s
+; RUN: llvm-readobj --symbols %t.o | FileCheck --check-prefix=CHECKSYM %s
+
+; RUN: not --crash llc -verify-machineinstrs -mcpu=pwr4 -mtriple powerpc64-ibm-aix-xcoff \
+; RUN: -mattr=-altivec -filetype=obj -o %t.o 2>&1 < %s | FileCheck --check-prefix=XCOFF64 %s
+; XCOFF64: LLVM ERROR: 64-bit XCOFF object files are not supported yet.
+
+%struct.S = type { i32, i32 }
+
+@s = external global %struct.S, align 4
+
+define void @bar() {
+entry:
+  %0 = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @s, i32 0, i32 1), align 4
+  %1 = trunc i32 %0 to i8
+  %2 = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @s, i32 0, i32 1), align 4
+  call void @llvm.memset.p0i8.i32(i8* align 4 bitcast (%struct.S* @s to i8*), i8 %1, i32 %2, i1 false)
+  ret void
+}
+
+declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1 immarg)
+
+; COMMON:       .globl  bar[DS]                 # -- Begin function bar
+; COMMON-NEXT:  .globl  .bar
+; COMMON-NEXT:  .align  4
+; COMMON-NEXT:  .csect bar[DS]
+; BIT32-NEXT:   .long   .bar                    # @bar
+; BIT64-NEXT:   .llong  .bar                    # @bar
+; BIT32-NEXT:   .long   TOC[TC0]
+; BIT64-NEXT:   .llong  TOC[TC0]
+; BIT32-NEXT:   .long  0
+; BIT64-NEXT:   .llong  0
+; COMMON-NEXT:  .csect .text[PR]
+; COMMON-NEXT: .bar:
+; COMMON-NEXT: # %bb.0:                                # %entry
+; COMMON-NEXT:  mflr 0
+; COMMON:       bl .memset
+
+; COMMON:       .extern s[UA]
+; COMMON-NEXT:  .extern .memset
+; COMMON-NEXT:  .toc
+; COMMON-NEXT: LC0:
+; COMMON-NEXT:  .tc s[TC],s[UA]
+
+; CHECKSYM:      Symbols [
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index:]]
+; CHECKSYM-NEXT:     Name: .memset
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x0
+; CHECKSYM-NEXT:     Section: N_UNDEF
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_EXT (0x2)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+1]]
+; CHECKSYM-NEXT:       SectionLen: 0
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 0
+; CHECKSYM-NEXT:       SymbolType: XTY_ER (0x0)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_PR (0x0)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index+2]]
+; CHECKSYM-NEXT:     Name: s
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x0
+; CHECKSYM-NEXT:     Section: N_UNDEF
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_EXT (0x2)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+3]]
+; CHECKSYM-NEXT:       SectionLen: 0
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 0
+; CHECKSYM-NEXT:       SymbolType: XTY_ER (0x0)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_UA (0x4)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index+4]]
+; CHECKSYM-NEXT:     Name: .text
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x0
+; CHECKSYM-NEXT:     Section: .text
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_HIDEXT (0x6B)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+5]]
+; CHECKSYM-NEXT:       SectionLen: 48
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 4
+; CHECKSYM-NEXT:       SymbolType: XTY_SD (0x1)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_PR (0x0)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index+6]]
+; CHECKSYM-NEXT:     Name: .bar
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x0
+; CHECKSYM-NEXT:     Section: .text
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_EXT (0x2)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+7]]
+; CHECKSYM-NEXT:       ContainingCsectSymbolIndex: [[#Index+4]]
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 0
+; CHECKSYM-NEXT:       SymbolType: XTY_LD (0x2)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_PR (0x0)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index+8]]
+; CHECKSYM-NEXT:     Name: bar
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x30
+; CHECKSYM-NEXT:     Section: .data
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_EXT (0x2)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+9]]
+; CHECKSYM-NEXT:       SectionLen: 12
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 2
+; CHECKSYM-NEXT:       SymbolType: XTY_SD (0x1)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_DS (0xA)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index+10]]
+; CHECKSYM-NEXT:     Name: TOC
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x3C
+; CHECKSYM-NEXT:     Section: .data
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_HIDEXT (0x6B)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+11]]
+; CHECKSYM-NEXT:       SectionLen: 0
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 2
+; CHECKSYM-NEXT:       SymbolType: XTY_SD (0x1)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_TC0 (0xF)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT:   Symbol {
+; CHECKSYM-NEXT:     Index: [[#Index+12]]
+; CHECKSYM-NEXT:     Name: s
+; CHECKSYM-NEXT:     Value (RelocatableAddress): 0x3C
+; CHECKSYM-NEXT:     Section: .data
+; CHECKSYM-NEXT:     Type: 0x0
+; CHECKSYM-NEXT:     StorageClass: C_HIDEXT (0x6B)
+; CHECKSYM-NEXT:     NumberOfAuxEntries: 1
+; CHECKSYM-NEXT:     CSECT Auxiliary Entry {
+; CHECKSYM-NEXT:       Index: [[#Index+13]]
+; CHECKSYM-NEXT:       SectionLen: 4
+; CHECKSYM-NEXT:       ParameterHashIndex: 0x0
+; CHECKSYM-NEXT:       TypeChkSectNum: 0x0
+; CHECKSYM-NEXT:       SymbolAlignmentLog2: 2
+; CHECKSYM-NEXT:       SymbolType: XTY_SD (0x1)
+; CHECKSYM-NEXT:       StorageMappingClass: XMC_TC (0x3)
+; CHECKSYM-NEXT:       StabInfoIndex: 0x0
+; CHECKSYM-NEXT:       StabSectNum: 0x0
+; CHECKSYM-NEXT:     }
+; CHECKSYM-NEXT:   }
+; CHECKSYM-NEXT: ]
+