Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -756,6 +756,8 @@
 def fno_gnu_keywords : Flag<["-"], "fno-gnu-keywords">, Group<f_Group>, Flags<[CC1Option]>;
 def fno_inline_functions : Flag<["-"], "fno-inline-functions">, Group<f_clang_Group>, Flags<[CC1Option]>;
 def fno_inline : Flag<["-"], "fno-inline">, Group<f_clang_Group>, Flags<[CC1Option]>;
+def fveclib : Joined<["-"], "fveclib=">, Group<f_Group>, Flags<[CC1Option]>,
+    HelpText<"Use the given vector functions library">;
 def fno_lax_vector_conversions : Flag<["-"], "fno-lax-vector-conversions">, Group<f_Group>,
   HelpText<"Disallow implicit conversions between vectors with a different number of elements or different element types">, Flags<[CC1Option]>;
 def fno_merge_all_constants : Flag<["-"], "fno-merge-all-constants">, Group<f_Group>,
Index: include/clang/Frontend/CodeGenOptions.h
===================================================================
--- include/clang/Frontend/CodeGenOptions.h
+++ include/clang/Frontend/CodeGenOptions.h
@@ -46,6 +46,11 @@
     OnlyAlwaysInlining  // Only run the always inlining pass.
   };
 
+  enum VectorLibrary {
+    NoLibrary, // Don't use any vector library.
+    Accelerate // Use the Accelerate framework.
+  };
+
   enum ObjCDispatchMethodKind {
     Legacy = 0,
     NonLegacy = 1,
Index: include/clang/Frontend/CodeGenOptions.def
===================================================================
--- include/clang/Frontend/CodeGenOptions.def
+++ include/clang/Frontend/CodeGenOptions.def
@@ -161,6 +161,9 @@
 /// The kind of inlining to perform.
 ENUM_CODEGENOPT(Inlining, InliningMethod, 2, NoInlining)
 
+// Vector functions library to use.
+ENUM_CODEGENOPT(VecLib, VectorLibrary, 1, NoLibrary)
+
 /// The default TLS model to use.
 ENUM_CODEGENOPT(DefaultTLSModel, TLSModel, 2, GeneralDynamicTLSModel)
 
Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -237,6 +237,14 @@
   TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
   if (!CodeGenOpts.SimplifyLibCalls)
     TLII->disableAllFunctions();
+
+  switch (CodeGenOpts.getVecLib()) {
+  case CodeGenOptions::Accelerate:
+    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::Accelerate);
+    break;
+  default:
+    break;
+  }
   return TLII;
 }
 
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -2851,6 +2851,8 @@
   else
     CmdArgs.push_back(Args.MakeArgString(getToolChain().getThreadModel()));
 
+  Args.AddLastArg(CmdArgs, options::OPT_fveclib);
+
   if (!Args.hasFlag(options::OPT_fmerge_all_constants,
                     options::OPT_fno_merge_all_constants))
     CmdArgs.push_back("-fno-merge-all-constants");
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -367,6 +367,16 @@
   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
 
+  if (Arg *A = Args.getLastArg(OPT_fveclib)) {
+    StringRef Name = A->getValue();
+    if (Name == "Accelerate")
+      Opts.setVecLib(CodeGenOptions::Accelerate);
+    else if (Name == "none")
+      Opts.setVecLib(CodeGenOptions::NoLibrary);
+    else
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
+  }
+
   if (Args.hasArg(OPT_gline_tables_only)) {
     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
   } else if (Args.hasArg(OPT_g_Flag) || Args.hasArg(OPT_gdwarf_2) ||
Index: test/Driver/fveclib.c
===================================================================
--- /dev/null
+++ test/Driver/fveclib.c
@@ -0,0 +1,8 @@
+// RUN: %clang -### -c -fveclib=none %s 2>&1 | FileCheck -check-prefix CHECK-NOLIB %s
+// RUN: %clang -### -c -fveclib=Accelerate %s 2>&1 | FileCheck -check-prefix CHECK-ACCELERATE %s
+// RUN: not %clang -c -fveclib=something %s 2>&1 | FileCheck -check-prefix CHECK-INVALID %s
+
+// CHECK-NOLIB: "-fveclib=none"
+// CHECK-ACCELERATE: "-fveclib=Accelerate"
+
+// CHECK-INVALID: error: invalid value 'something' in '-fveclib=something'