diff --git a/llvm/test/Instrumentation/InstrProfiling/linkage.ll b/llvm/test/Instrumentation/InstrProfiling/linkage.ll
--- a/llvm/test/Instrumentation/InstrProfiling/linkage.ll
+++ b/llvm/test/Instrumentation/InstrProfiling/linkage.ll
@@ -8,8 +8,10 @@
 ; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
 ; RUN: opt < %s -mtriple=x86_64-unknown-fuchsia -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
 ; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -passes=instrprof -S | FileCheck %s --check-prefixes=COFF
+; RUN: opt < %s -mtriple=powerpc64-ibm-aix-xcoff -passes=instrprof -S | FileCheck %s --check-prefixes=XCOFF
 
 ; MACHO: @__llvm_profile_runtime = external global i32
+; XCOFF: @__llvm_profile_runtime = external global i32
 ; ELF-NOT: @__llvm_profile_runtime = external global i32
 
 ; ELF: $__profc_foo = comdat nodeduplicate
@@ -31,6 +33,10 @@
 ; COFF: @__profc_foo = private global
 ; COFF-NOT: comdat
 ; COFF: @__profd_foo = private global
+; XCOFF: @__profc_foo = private global
+; XCOFF-NOT: comdat
+; XCOFF: @__profd_foo = private global
+
 define void @foo() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -42,6 +48,8 @@
 ; MACHO: @__profd_foo_weak = weak hidden global
 ; COFF: @__profc_foo_weak = weak hidden global
 ; COFF: @__profd_foo_weak = private global
+; XCOFF: @__profc_foo_weak = weak hidden global
+; XCOFF: @__profd_foo_weak = weak hidden global
 define weak void @foo_weak() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @__profn_foo_weak, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -53,6 +61,8 @@
 ; MACHO: @"__profd_linkage.ll:foo_internal" = private global
 ; COFF: @"__profc_linkage.ll:foo_internal" = private global
 ; COFF: @"__profd_linkage.ll:foo_internal" = private global
+; XCOFF: @"__profc_linkage.ll:foo_internal" = private global
+; XCOFF: @"__profd_linkage.ll:foo_internal" = private global
 define internal void @foo_internal() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @"__profn_linkage.ll:foo_internal", i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -64,6 +74,8 @@
 ; MACHO: @__profd_foo_inline = linkonce_odr hidden global
 ; COFF: @__profc_foo_inline = linkonce_odr hidden global{{.*}} section ".lprfc$M", align 8
 ; COFF: @__profd_foo_inline = private global{{.*}} section ".lprfd$M", align 8
+; XCOFF: @__profc_foo_inline = linkonce_odr hidden global
+; XCOFF: @__profd_foo_inline = linkonce_odr hidden global
 define linkonce_odr void @foo_inline() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_inline, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -75,6 +87,8 @@
 ; MACHO: @__profd_foo_extern = linkonce_odr hidden global
 ; COFF: @__profc_foo_extern = linkonce_odr hidden global {{.*}}section ".lprfc$M", comdat, align 8
 ; COFF: @__profd_foo_extern = private global {{.*}}section ".lprfd$M", comdat($__profc_foo_extern), align 8
+; XCOFF: @__profc_foo_extern = linkonce_odr hidden global
+; XCOFF: @__profd_foo_extern = linkonce_odr hidden global
 define available_externally void @foo_extern() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_extern, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -89,3 +103,7 @@
 ; COFF: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} comdat {
 ; ELF-NOT: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
 ; ELF-NOT:   %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
+; XCOFF: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
+; XCOFF:   %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
+; XCOFF:   ret i32 %[[REG]]
+; XCOFF: }
diff --git a/llvm/test/Instrumentation/InstrProfiling/no-counters.ll b/llvm/test/Instrumentation/InstrProfiling/no-counters.ll
--- a/llvm/test/Instrumentation/InstrProfiling/no-counters.ll
+++ b/llvm/test/Instrumentation/InstrProfiling/no-counters.ll
@@ -3,6 +3,7 @@
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s -check-prefixes=ALL,DARWIN
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -passes=instrprof -S | FileCheck %s -check-prefixes=ALL,DARWIN
 ; RUN: opt < %s -mtriple=x86_64-linux-unknown -passes=instrprof -S | FileCheck %s -check-prefixes=ALL,LINUX
+; RUN: opt < %s -mtriple=powerpc64-ibm-aix-xcoff -passes=instrprof -S | FileCheck %s -check-prefixes=ALL,DARWIN
 ; ALL-NOT: @__profc
 ; ALL-NOT: @__profd
 ; DARWIN: @__llvm_profile_runtime
diff --git a/llvm/test/Instrumentation/InstrProfiling/profiling.ll b/llvm/test/Instrumentation/InstrProfiling/profiling.ll
--- a/llvm/test/Instrumentation/InstrProfiling/profiling.ll
+++ b/llvm/test/Instrumentation/InstrProfiling/profiling.ll
@@ -2,6 +2,7 @@
 ; RUN: opt < %s -mtriple=x86_64-linux -passes=instrprof -S | FileCheck %s --check-prefixes=CHECK,ELF_LINUX
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -passes=instrprof -S | FileCheck %s --check-prefixes=CHECK,MACHO
 ; RUN: opt < %s -mtriple=x86_64-windows -passes=instrprof -S | FileCheck %s --check-prefixes=CHECK,WIN
+; RUN: opt < %s -mtriple=powerpc64-ibm-aix-xcoff -passes=instrprof -S | FileCheck %s --check-prefixes=CHECK,XCOFF
 
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s
 
@@ -9,6 +10,7 @@
 ; ELF_LINUX-NOT: @__llvm_profile_runtime
 ; MACHO: @__llvm_profile_runtime = external global i32
 ; WIN: @__llvm_profile_runtime = external global i32
+; XCOFF: @__llvm_profile_runtime = external global i32
 
 @__profn_foo = private constant [3 x i8] c"foo"
 ; CHECK-NOT: __profn_foo
@@ -23,6 +25,8 @@
 ; MACHO: @__profd_foo = private {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
 ; WIN:   @__profc_foo = private global [1 x i64] zeroinitializer, section ".lprfc$M", align 8
 ; WIN:   @__profd_foo = private {{.*}}, section ".lprfd$M", align 8
+; XCOFF: @__profc_foo = private global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", align 8
+; XCOFF: @__profd_foo = private {{.*}}, section "__llvm_prf_data", align 8
 define void @foo() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -34,6 +38,8 @@
 ; MACHO: @__profd_bar = private {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
 ; WIN:   @__profc_bar = private global [1 x i64] zeroinitializer, section ".lprfc$M", align 8
 ; WIN:   @__profd_bar = private {{.*}}, section ".lprfd$M", align 8
+; XCOFF: @__profc_bar = private global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", align 8
+; XCOFF: @__profd_bar = private {{.*}}, section "__llvm_prf_data", align 8
 define void @bar() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_bar, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -45,6 +51,8 @@
 ; MACHO: @__profd_baz = private {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
 ; WIN:   @__profc_baz = private global [3 x i64] zeroinitializer, section ".lprfc$M", align 8
 ; WIN:   @__profd_baz = private {{.*}}, section ".lprfd$M", align 8
+; XCOFF:   @__profc_baz = private global [3 x i64] zeroinitializer, section "__llvm_prf_cnts", align 8
+; XCOFF:   @__profd_baz = private {{.*}}, section "__llvm_prf_data", align 8
 define void @baz() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_baz, i32 0, i32 0), i64 0, i32 3, i32 0)
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_baz, i32 0, i32 0), i64 0, i32 3, i32 1)
@@ -67,4 +75,13 @@
 ; ELF_GENERIC-NEXT:   ret void
 ; ELF_GENERIC-NEXT: }
 
+; XCOFF:      define internal void @__llvm_profile_register_functions() unnamed_addr {
+; XCOFF-NEXT:   call void @__llvm_profile_register_function(i8* bitcast ({ i64, i64, i64, i8*, i8*, i32, [{{.*}} x i16] }* @__profd_foo to i8*))
+; XCOFF-NEXT:   call void @__llvm_profile_register_function(i8* bitcast ({ i64, i64, i64, i8*, i8*, i32, [{{.*}} x i16] }* @__profd_bar to i8*))
+; XCOFF-NEXT:   call void @__llvm_profile_register_function(i8* bitcast ({ i64, i64, i64, i8*, i8*, i32, [{{.*}} x i16] }* @__profd_baz to i8*))
+; XCOFF-NEXT:   call void @__llvm_profile_register_names_function(i8* getelementptr inbounds {{.*}} @__llvm_prf_nm
+; XCOFF-NEXT:   ret void
+; XCOFF-NEXT: }
+
+
 ; ELF_LINUX-NOT: @__llvm_profile_register_functions()