diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index 7f67a4159df..920fa1a3b89 100644
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -660,6 +660,14 @@ def STHU8 : DForm_1a<45, (outs ptr_rc:$ea_res), (ins G8RC:$rS,
                                         iaddroff:$ptroff))]>,
                     RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
 
+def STWU8 : DForm_1a<37, (outs ptr_rc:$ea_res), (ins G8RC:$rS,
+                             symbolLo:$ptroff, ptr_rc:$ptrreg),
+                    "stwu $rS, $ptroff($ptrreg)", LdStStore,
+                    [(set ptr_rc:$ea_res,
+                          (pre_truncsti32 G8RC:$rS, ptr_rc:$ptrreg,
+                                          iaddroff:$ptroff))]>,
+                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
+
 def STDU : DSForm_1a<62, 1, (outs ptr_rc:$ea_res), (ins G8RC:$rS,
                                         s16immX4:$ptroff, ptr_rc:$ptrreg),
                     "stdu $rS, $ptroff($ptrreg)", LdStSTD,
diff --git a/test/CodeGen/PowerPC/stwu8.ll b/test/CodeGen/PowerPC/stwu8.ll
new file mode 100644
index 00000000000..fabf7636acf
--- /dev/null
+++ b/test/CodeGen/PowerPC/stwu8.ll
@@ -0,0 +1,28 @@
+; RUN: llc -enable-ppc-preinc < %s | FileCheck %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+%class.spell_checker.21.103.513.538 = type { %"class.std::map.20.102.512.537" }
+%"class.std::map.20.102.512.537" = type { %"class.std::_Rb_tree.19.101.511.536" }
+%"class.std::_Rb_tree.19.101.511.536" = type { %"struct.std::_Rb_tree<std::pair<const char *, const char *>, std::pair<const std::pair<const char *, const char *>, int>, std::_Select1st<std::pair<const std::pair<const char *, const char *>, int>>, std::less<std::pair<const char *, const char *>>, std::allocator<std::pair<const std::pair<const char *, const char *>, int>> >::_Rb_tree_impl.18.100.510.535" }
+%"struct.std::_Rb_tree<std::pair<const char *, const char *>, std::pair<const std::pair<const char *, const char *>, int>, std::_Select1st<std::pair<const std::pair<const char *, const char *>, int>>, std::less<std::pair<const char *, const char *>>, std::allocator<std::pair<const std::pair<const char *, const char *>, int>> >::_Rb_tree_impl.18.100.510.535" = type { %"struct.std::less.16.98.508.533", %"struct.std::_Rb_tree_node_base.17.99.509.534", i64 }
+%"struct.std::less.16.98.508.533" = type { i8 }
+%"struct.std::_Rb_tree_node_base.17.99.509.534" = type { i32, %"struct.std::_Rb_tree_node_base.17.99.509.534"*, %"struct.std::_Rb_tree_node_base.17.99.509.534"*, %"struct.std::_Rb_tree_node_base.17.99.509.534"* }
+
+define void @test1(%class.spell_checker.21.103.513.538* %this) unnamed_addr align 2 {
+entry:
+  %_M_header.i.i.i.i.i.i = getelementptr inbounds %class.spell_checker.21.103.513.538* %this, i64 0, i32 0, i32 0, i32 0, i32 1
+  %0 = bitcast %"struct.std::_Rb_tree_node_base.17.99.509.534"* %_M_header.i.i.i.i.i.i to i8*
+  call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 40, i32 4, i1 false) nounwind
+  store %"struct.std::_Rb_tree_node_base.17.99.509.534"* %_M_header.i.i.i.i.i.i, %"struct.std::_Rb_tree_node_base.17.99.509.534"** undef, align 8, !tbaa !0
+  unreachable
+}
+
+; CHECK: @test1
+; CHECK: stwu
+
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
+
+!0 = metadata !{metadata !"any pointer", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}