diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
@@ -86,4 +86,5 @@
 PPCXCOFFMCAsmInfo::PPCXCOFFMCAsmInfo(bool Is64Bit, const Triple &T) {
   assert(!IsLittleEndian && "Little-endian XCOFF not supported.");
   CodePointerSize = CalleeSaveStackSlotSize = Is64Bit ? 8 : 4;
+  ZeroDirective = "\t.space\t";
 }
diff --git a/llvm/test/CodeGen/PowerPC/aix-space.ll b/llvm/test/CodeGen/PowerPC/aix-space.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/aix-space.ll
@@ -0,0 +1,17 @@
+; RUN: llc -verify-machineinstrs -O0 -mcpu=pwr7 -mtriple powerpc-ibm-aix-xcoff < %s | FileCheck %s
+
+@a = common global double 0.000000e+00, align 8
+
+; Get some constants into the constant pool that need spacing for alignment
+define void @e() {
+entry:
+  %0 = load double, double* @a, align 8
+  %mul = fmul double 1.500000e+00, %0
+  store double %mul, double* @a, align 8
+  %mul1 = fmul double 0x3F9C71C71C71C71C, %0
+  store double %mul1, double* @a, align 8
+  ret void
+}
+
+; CHECK:      .space 4
+; CHECK-NOT:  .zero