diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -1073,6 +1073,7 @@
     /// Override to support customized stack guard loading.
     bool useLoadStackGuardNode() const override;
     void insertSSPDeclarations(Module &M) const override;
+    Value *getSDagStackGuard(const Module &M) const override;
 
     bool isFPImmLegal(const APFloat &Imm, EVT VT,
                       bool ForCodeSize) const override;
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
@@ -130,6 +130,8 @@
 
 static SDValue widenVec(SelectionDAG &DAG, SDValue Vec, const SDLoc &dl);
 
+static const char AIXSSPCanaryWordName[] = "__ssp_canary_word";
+
 // FIXME: Remove this once the bug has been fixed!
 extern cl::opt<bool> ANDIGlueBug;
 
@@ -16406,12 +16408,24 @@
   return true;
 }
 
-// Override to disable global variable loading on Linux.
+// Override to disable global variable loading on Linux and insert AIX canary
+// word declaration.
 void PPCTargetLowering::insertSSPDeclarations(Module &M) const {
+  if (Subtarget.isAIXABI()) {
+    M.getOrInsertGlobal(AIXSSPCanaryWordName,
+                        Type::getInt8PtrTy(M.getContext()));
+    return;
+  }
   if (!Subtarget.isTargetLinux())
     return TargetLowering::insertSSPDeclarations(M);
 }
 
+Value *PPCTargetLowering::getSDagStackGuard(const Module &M) const {
+  if (Subtarget.isAIXABI())
+    return M.getGlobalVariable(AIXSSPCanaryWordName);
+  return TargetLowering::getSDagStackGuard(M);
+}
+
 bool PPCTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT,
                                      bool ForCodeSize) const {
   if (!VT.isSimple() || !Subtarget.hasVSX())
diff --git a/llvm/test/CodeGen/PowerPC/stack-guard-oob.ll b/llvm/test/CodeGen/PowerPC/stack-guard-oob.ll
--- a/llvm/test/CodeGen/PowerPC/stack-guard-oob.ll
+++ b/llvm/test/CodeGen/PowerPC/stack-guard-oob.ll
@@ -1,7 +1,9 @@
 ; RUN: llc -mtriple=powerpc64le -O0 < %s | FileCheck %s
+; RUN: llc -mtriple=powerpc64-ibm-aix-xcoff -O0 < %s | FileCheck %s --check-prefix=AIX
 
 ; CHECK-LABEL: in_bounds:
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define i32 @in_bounds() #0 {
   %var = alloca i32, align 4
   store i32 0, i32* %var, align 4
@@ -12,6 +14,7 @@
 
 ; CHECK-LABEL: constant_out_of_bounds:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @constant_out_of_bounds() #0 {
   %var = alloca i32, align 4
   store i32 0, i32* %var, align 4
@@ -22,6 +25,7 @@
 
 ; CHECK-LABEL: nonconstant_out_of_bounds:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @nonconstant_out_of_bounds(i32 %n) #0 {
   %var = alloca i32, align 4
   store i32 0, i32* %var, align 4
@@ -32,6 +36,7 @@
 
 ; CHECK-LABEL: phi_before_gep_in_bounds:
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define i32 @phi_before_gep_in_bounds(i32 %k) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -53,6 +58,7 @@
 
 ; CHECK-LABEL: phi_before_gep_constant_out_of_bounds:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @phi_before_gep_constant_out_of_bounds(i32 %k) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -74,6 +80,7 @@
 
 ; CHECK-LABEL: phi_before_gep_nonconstant_out_of_bounds:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @phi_before_gep_nonconstant_out_of_bounds(i32 %k, i32 %n) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -95,6 +102,7 @@
 
 ; CHECK-LABEL: phi_after_gep_in_bounds:
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define i32 @phi_after_gep_in_bounds(i32 %k) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -120,6 +128,7 @@
 
 ; CHECK-LABEL: phi_after_gep_constant_out_of_bounds_a:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @phi_after_gep_constant_out_of_bounds_a(i32 %k) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -145,6 +154,7 @@
 
 ; CHECK-LABEL: phi_after_gep_constant_out_of_bounds_b:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @phi_after_gep_constant_out_of_bounds_b(i32 %k) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -170,6 +180,7 @@
 
 ; CHECK-LABEL: phi_different_types_a:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i64 @phi_different_types_a(i32 %k) #0 {
 entry:
   %var1 = alloca i64, align 4
@@ -191,6 +202,7 @@
 
 ; CHECK-LABEL: phi_different_types_b:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i64 @phi_different_types_b(i32 %k) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -212,6 +224,7 @@
 
 ; CHECK-LABEL: phi_after_gep_nonconstant_out_of_bounds_a:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @phi_after_gep_nonconstant_out_of_bounds_a(i32 %k, i32 %n) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -237,6 +250,7 @@
 
 ; CHECK-LABEL: phi_after_gep_nonconstant_out_of_bounds_b:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @phi_after_gep_nonconstant_out_of_bounds_b(i32 %k, i32 %n) #0 {
 entry:
   %var1 = alloca i32, align 4
@@ -265,6 +279,7 @@
 
 ; CHECK-LABEL: struct_in_bounds:
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define void @struct_in_bounds() #0 {
   %var = alloca %struct.outer, align 4
   %outergep = getelementptr inbounds %struct.outer, %struct.outer* %var, i32 0, i32 1
@@ -275,6 +290,7 @@
 
 ; CHECK-LABEL: struct_constant_out_of_bounds_a:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define void @struct_constant_out_of_bounds_a() #0 {
   %var = alloca %struct.outer, align 4
   %outergep = getelementptr inbounds %struct.outer, %struct.outer* %var, i32 1, i32 0
@@ -287,6 +303,7 @@
 ; Here the offset is out-of-bounds of the addressed struct.inner member, but
 ; still within bounds of the outer struct so no stack guard is needed.
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define void @struct_constant_out_of_bounds_b() #0 {
   %var = alloca %struct.outer, align 4
   %outergep = getelementptr inbounds %struct.outer, %struct.outer* %var, i32 0, i32 0
@@ -298,6 +315,7 @@
 ; CHECK-LABEL: struct_constant_out_of_bounds_c:
 ; Here we are out-of-bounds of both the inner and outer struct.
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define void @struct_constant_out_of_bounds_c() #0 {
   %var = alloca %struct.outer, align 4
   %outergep = getelementptr inbounds %struct.outer, %struct.outer* %var, i32 0, i32 1
@@ -308,6 +326,7 @@
 
 ; CHECK-LABEL: struct_nonconstant_out_of_bounds_a:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define void @struct_nonconstant_out_of_bounds_a(i32 %n) #0 {
   %var = alloca %struct.outer, align 4
   %outergep = getelementptr inbounds %struct.outer, %struct.outer* %var, i32 %n, i32 0
@@ -318,6 +337,7 @@
 
 ; CHECK-LABEL: struct_nonconstant_out_of_bounds_b:
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define void @struct_nonconstant_out_of_bounds_b(i32 %n) #0 {
   %var = alloca %struct.outer, align 4
   %outergep = getelementptr inbounds %struct.outer, %struct.outer* %var, i32 0, i32 0
@@ -328,6 +348,7 @@
 
 ; CHECK-LABEL: bitcast_smaller_load
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define i32 @bitcast_smaller_load() #0 {
   %var = alloca i64, align 4
   store i64 0, i64* %var, align 4
@@ -338,6 +359,7 @@
 
 ; CHECK-LABEL: bitcast_same_size_load
 ; CHECK-NOT: __stack_chk_guard
+; AIX-NOT: __ssp_canary_word
 define i32 @bitcast_same_size_load() #0 {
   %var = alloca i64, align 4
   store i64 0, i64* %var, align 4
@@ -349,6 +371,7 @@
 
 ; CHECK-LABEL: bitcast_larger_load
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i64 @bitcast_larger_load() #0 {
   %var = alloca i32, align 4
   store i32 0, i32* %var, align 4
@@ -359,6 +382,7 @@
 
 ; CHECK-LABEL: bitcast_larger_store
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @bitcast_larger_store() #0 {
   %var = alloca i32, align 4
   %bitcast = bitcast i32* %var to i64*
@@ -369,6 +393,7 @@
 
 ; CHECK-LABEL: bitcast_larger_cmpxchg
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i64 @bitcast_larger_cmpxchg(i64 %desired, i64 %new) #0 {
   %var = alloca i32, align 4
   %bitcast = bitcast i32* %var to i64*
@@ -379,6 +404,7 @@
 
 ; CHECK-LABEL: bitcast_larger_atomic_rmw
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i64 @bitcast_larger_atomic_rmw() #0 {
   %var = alloca i32, align 4
   %bitcast = bitcast i32* %var to i64*
@@ -390,6 +416,7 @@
 
 ; CHECK-LABEL: bitcast_overlap
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @bitcast_overlap() #0 {
   %var = alloca i32, align 4
   %bitcast = bitcast i32* %var to %struct.packed*
@@ -402,6 +429,7 @@
 
 ; CHECK-LABEL: multi_dimensional_array
 ; CHECK: __stack_chk_guard
+; AIX: __ssp_canary_word
 define i32 @multi_dimensional_array() #0 {
   %var = alloca %struct.multi_dimensional, align 4
   %gep1 = getelementptr inbounds %struct.multi_dimensional, %struct.multi_dimensional* %var, i32 0, i32 0