diff --git a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
--- a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
+++ b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
@@ -99,12 +99,10 @@
 
 class PPCAsmParser : public MCTargetAsmParser {
   bool IsPPC64;
-  bool IsDarwin;
 
   void Warning(SMLoc L, const Twine &Msg) { getParser().Warning(L, Msg); }
 
   bool isPPC64() const { return IsPPC64; }
-  bool isDarwin() const { return IsDarwin; }
 
   bool MatchRegisterName(unsigned &RegNo, int64_t &IntVal);
 
@@ -116,14 +114,12 @@
                                         PPCMCExpr::VariantKind &Variant);
   const MCExpr *FixupVariantKind(const MCExpr *E);
   bool ParseExpression(const MCExpr *&EVal);
-  bool ParseDarwinExpression(const MCExpr *&EVal);
 
   bool ParseOperand(OperandVector &Operands);
 
   bool ParseDirectiveWord(unsigned Size, AsmToken ID);
   bool ParseDirectiveTC(unsigned Size, AsmToken ID);
   bool ParseDirectiveMachine(SMLoc L);
-  bool ParseDarwinDirectiveMachine(SMLoc L);
   bool ParseDirectiveAbiVersion(SMLoc L);
   bool ParseDirectiveLocalEntry(SMLoc L);
 
@@ -150,7 +146,6 @@
     // Check for 64-bit vs. 32-bit pointer mode.
     const Triple &TheTriple = STI.getTargetTriple();
     IsPPC64 = TheTriple.isPPC64();
-    IsDarwin = TheTriple.isMacOSX();
     // Initialize the set of available features.
     setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
   }
@@ -1404,10 +1399,6 @@
 /// it handles modifiers.
 bool PPCAsmParser::
 ParseExpression(const MCExpr *&EVal) {
-
-  if (isDarwin())
-    return ParseDarwinExpression(EVal);
-
   // (ELF Platforms)
   // Handle \code @l/@ha \endcode
   if (getParser().parseExpression(EVal))
@@ -1423,53 +1414,6 @@
   return false;
 }
 
-/// ParseDarwinExpression.  (MachO Platforms)
-/// This differs from the default "parseExpression" in that it handles detection
-/// of the \code hi16(), ha16() and lo16() \endcode modifiers.  At present,
-/// parseExpression() doesn't recognise the modifiers when in the Darwin/MachO
-/// syntax form so it is done here.  TODO: Determine if there is merit in
-/// arranging for this to be done at a higher level.
-bool PPCAsmParser::
-ParseDarwinExpression(const MCExpr *&EVal) {
-  MCAsmParser &Parser = getParser();
-  PPCMCExpr::VariantKind Variant = PPCMCExpr::VK_PPC_None;
-  switch (getLexer().getKind()) {
-  default:
-    break;
-  case AsmToken::Identifier:
-    // Compiler-generated Darwin identifiers begin with L,l,_ or "; thus
-    // something starting with any other char should be part of the
-    // asm syntax.  If handwritten asm includes an identifier like lo16,
-    // then all bets are off - but no-one would do that, right?
-    StringRef poss = Parser.getTok().getString();
-    if (poss.equals_lower("lo16")) {
-      Variant = PPCMCExpr::VK_PPC_LO;
-    } else if (poss.equals_lower("hi16")) {
-      Variant = PPCMCExpr::VK_PPC_HI;
-    } else if (poss.equals_lower("ha16")) {
-      Variant = PPCMCExpr::VK_PPC_HA;
-    }
-    if (Variant != PPCMCExpr::VK_PPC_None) {
-      Parser.Lex(); // Eat the xx16
-      if (getLexer().isNot(AsmToken::LParen))
-        return Error(Parser.getTok().getLoc(), "expected '('");
-      Parser.Lex(); // Eat the '('
-    }
-    break;
-  }
-
-  if (getParser().parseExpression(EVal))
-    return true;
-
-  if (Variant != PPCMCExpr::VK_PPC_None) {
-    if (getLexer().isNot(AsmToken::RParen))
-      return Error(Parser.getTok().getLoc(), "expected ')'");
-    Parser.Lex(); // Eat the ')'
-    EVal = PPCMCExpr::create(Variant, EVal, getParser().getContext());
-  }
-  return false;
-}
-
 /// ParseOperand
 /// This handles registers in the form 'NN', '%rNN' for ELF platforms and
 /// rNN for MachO.
@@ -1501,20 +1445,6 @@
   case AsmToken::Dollar:
   case AsmToken::Exclaim:
   case AsmToken::Tilde:
-    // Note that non-register-name identifiers from the compiler will begin
-    // with '_', 'L'/'l' or '"'.  Of course, handwritten asm could include
-    // identifiers like r31foo - so we fall through in the event that parsing
-    // a register name fails.
-    if (isDarwin()) {
-      unsigned RegNo;
-      int64_t IntVal;
-      if (!MatchRegisterName(RegNo, IntVal)) {
-        Operands.push_back(PPCOperand::CreateImm(IntVal, S, E, isPPC64()));
-        return false;
-      }
-    }
-    // All other expressions
-
     if (!ParseExpression(EVal))
       break;
     // Fall-through
@@ -1560,21 +1490,11 @@
       break;
     }
     case AsmToken::Integer:
-      if (isDarwin())
-        return Error(S, "unexpected integer value");
-      else if (getParser().parseAbsoluteExpression(IntVal) || IntVal < 0 ||
-               IntVal > 31)
+      if (getParser().parseAbsoluteExpression(IntVal) || IntVal < 0 ||
+          IntVal > 31)
         return Error(S, "invalid register number");
       break;
-   case AsmToken::Identifier:
-    if (isDarwin()) {
-      unsigned RegNo;
-      if (!MatchRegisterName(RegNo, IntVal)) {
-        break;
-      }
-    }
-    LLVM_FALLTHROUGH;
-
+    case AsmToken::Identifier:
     default:
       return Error(S, "invalid memory operand");
     }
@@ -1658,12 +1578,7 @@
 /// ParseDirective parses the PPC specific directives
 bool PPCAsmParser::ParseDirective(AsmToken DirectiveID) {
   StringRef IDVal = DirectiveID.getIdentifier();
-  if (isDarwin()) {
-    if (IDVal == ".machine")
-      ParseDarwinDirectiveMachine(DirectiveID.getLoc());
-    else
-      return true;
-  } else if (IDVal == ".word")
+  if (IDVal == ".word")
     ParseDirectiveWord(2, DirectiveID);
   else if (IDVal == ".llong")
     ParseDirectiveWord(8, DirectiveID);
@@ -1754,31 +1669,6 @@
   return false;
 }
 
-/// ParseDarwinDirectiveMachine (Mach-o platforms)
-///  ::= .machine cpu-identifier
-bool PPCAsmParser::ParseDarwinDirectiveMachine(SMLoc L) {
-  MCAsmParser &Parser = getParser();
-  if (Parser.getTok().isNot(AsmToken::Identifier) &&
-      Parser.getTok().isNot(AsmToken::String))
-    return Error(L, "unexpected token in directive");
-
-  StringRef CPU = Parser.getTok().getIdentifier();
-  Parser.Lex();
-
-  // FIXME: this is only the 'default' set of cpu variants.
-  // However we don't act on this information at present, this is simply
-  // allowing parsing to proceed with minimal sanity checking.
-  if (check(CPU != "ppc7400" && CPU != "ppc" && CPU != "ppc64", L,
-            "unrecognized cpu type") ||
-      check(isPPC64() && (CPU == "ppc7400" || CPU == "ppc"), L,
-            "wrong cpu type specified for 64bit") ||
-      check(!isPPC64() && CPU == "ppc64", L,
-            "wrong cpu type specified for 32bit") ||
-      parseToken(AsmToken::EndOfStatement))
-    return addErrorSuffix(" in '.machine' directive");
-  return false;
-}
-
 /// ParseDirectiveAbiVersion
 ///  ::= .abiversion constant-expression
 bool PPCAsmParser::ParseDirectiveAbiVersion(SMLoc L) {
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -32,7 +32,6 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/BinaryFormat/ELF.h"
-#include "llvm/BinaryFormat/MachO.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFunction.h"
@@ -53,7 +52,6 @@
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCInstBuilder.h"
 #include "llvm/MC/MCSectionELF.h"
-#include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCSectionXCOFF.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
@@ -1220,10 +1218,6 @@
   case PPC::LWA: {
     // Verify alignment is legal, so we don't create relocations
     // that can't be supported.
-    // FIXME:  This test is currently disabled for Darwin.  The test
-    // suite shows a handful of test cases that fail this check for
-    // Darwin.  Those need to be investigated before this sanity test
-    // can be enabled for those subtargets.
     unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
     const MachineOperand &MO = MI->getOperand(OpNum);
     if (MO.isGlobal()) {
@@ -2062,10 +2056,8 @@
   }
 }
 
-/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
-/// for a MachineFunction to the given output stream, in a format that the
-/// Darwin assembler can deal with.
-///
+// Return a pass that prints the PPC assembly code for a MachineFunction to the
+// given output stream.
 static AsmPrinter *
 createPPCAsmPrinterPass(TargetMachine &tm,
                         std::unique_ptr<MCStreamer> &&Streamer) {