diff --git a/llvm/lib/Object/ObjectFile.cpp b/llvm/lib/Object/ObjectFile.cpp
--- a/llvm/lib/Object/ObjectFile.cpp
+++ b/llvm/lib/Object/ObjectFile.cpp
@@ -108,14 +108,17 @@
     setARMSubArch(TheTriple);
 
   // TheTriple defaults to ELF, and COFF doesn't have an environment:
-  // the best we can do here is indicate that it is mach-o.
-  if (isMachO())
+  // something we can do here is indicate that it is mach-o.
+  if (isMachO()) {
     TheTriple.setObjectFormat(Triple::MachO);
-
-  if (isCOFF()) {
+  } else if (isCOFF()) {
     const auto COFFObj = cast<COFFObjectFile>(this);
     if (COFFObj->getArch() == Triple::thumb)
       TheTriple.setTriple("thumbv7-windows");
+  } else if (isXCOFF()) {
+    // XCOFF implies AIX.
+    TheTriple.setOS(Triple::AIX);
+    TheTriple.setObjectFormat(Triple::XCOFF);
   }
 
   return TheTriple;
diff --git a/llvm/test/CodeGen/PowerPC/aix-return55.ll b/llvm/test/CodeGen/PowerPC/aix-return55.ll
--- a/llvm/test/CodeGen/PowerPC/aix-return55.ll
+++ b/llvm/test/CodeGen/PowerPC/aix-return55.ll
@@ -31,7 +31,7 @@
 ;CHECKOBJ-NEXT:      18: 00 01 23 45                   <unknown>
 ;CHECKOBJ-NEXT:      1c: 67 8a bc de                   oris 10, 28, 48350{{[[:space:]] *}}
 ;CHECKOBJ-NEXT: 00000020 <d>:
-;CHECKOBJ-NEXT:      20: 40 14 00 00                   bdnzf   20, .+0
+;CHECKOBJ-NEXT:      20: 40 14 00 00                   bdnzf   20, $+0
 ;CHECKOBJ-NEXT:      24: 00 00 00 00                   <unknown>{{[[:space:]] *}}
 ;CHECKOBJ-NEXT: 00000028 <foo>:
 ;CHECKOBJ-NEXT:      28: 00 00 00 00                   <unknown>
diff --git a/llvm/test/tools/llvm-objdump/XCOFF/disassemble-all.test b/llvm/test/tools/llvm-objdump/XCOFF/disassemble-all.test
--- a/llvm/test/tools/llvm-objdump/XCOFF/disassemble-all.test
+++ b/llvm/test/tools/llvm-objdump/XCOFF/disassemble-all.test
@@ -55,7 +55,7 @@
 CHECK-NEXT:        ...
 CHECK:        Disassembly of section .tdata:
 CHECK:        00000000 <d>:
-CHECK-NEXT:        0: 40 09 21 f9                  	bdnzfl	9, .+8696
+CHECK-NEXT:        0: 40 09 21 f9                  	bdnzfl	9, $+8696
 CHECK-NEXT:        4: f0 1b 86 6e                  	<unknown>
 CHECK:        Disassembly of section .tbss:
 CHECK:        00000008 <c>: