Index: cfe/trunk/lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- cfe/trunk/lib/Driver/ToolChains/Gnu.cpp
+++ cfe/trunk/lib/Driver/ToolChains/Gnu.cpp
@@ -42,6 +42,24 @@
          !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
 }
 
+// Switch CPU names not recognized by GNU assembler to a close CPU that it does
+// recognize, instead of a lower march from being picked in the absence of a cpu
+// flag.
+static void normalizeCPUNamesForAssembler(const ArgList &Args,
+                                          ArgStringList &CmdArgs) {
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    StringRef CPUArg(A->getValue());
+    if (CPUArg.equals_lower("krait"))
+      CmdArgs.push_back("-mcpu=cortex-a15");
+    else if(CPUArg.equals_lower("kryo") ||
+            CPUArg.equals_lower("falkor") ||
+            CPUArg.equals_lower("saphira"))
+      CmdArgs.push_back("-mcpu=cortex-a57");
+    else
+      Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
+  }
+}
+
 void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
                                       const InputInfo &Output,
                                       const InputInfoList &Inputs,
@@ -652,23 +670,16 @@
     }
 
     Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
+    normalizeCPUNamesForAssembler(Args, CmdArgs);
 
-    // FIXME: remove krait check when GNU tools support krait cpu
-    // for now replace it with -mcpu=cortex-a15 to avoid a lower
-    // march from being picked in the absence of a cpu flag.
-    Arg *A;
-    if ((A = Args.getLastArg(options::OPT_mcpu_EQ)) &&
-        StringRef(A->getValue()).equals_lower("krait"))
-      CmdArgs.push_back("-mcpu=cortex-a15");
-    else
-      Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
     Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
     break;
   }
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_be: {
     Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
-    Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
+    normalizeCPUNamesForAssembler(Args, CmdArgs);
+
     break;
   }
   case llvm::Triple::mips:
Index: cfe/trunk/test/Driver/as-mcpu.c
===================================================================
--- cfe/trunk/test/Driver/as-mcpu.c
+++ cfe/trunk/test/Driver/as-mcpu.c
@@ -0,0 +1,17 @@
+// ================== Check that krait is substituted by cortex-a15 when invoking
+// the assembler
+// RUN: %clang -target arm-linux -mcpu=krait -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A15 %s
+// CHECK-CORTEX-A15: as{{(.exe)?}}" "{{.*}}-mcpu=cortex-a15
+
+// ================== Check that kryo is substituted by cortex-a57 when invoking
+// the assembler
+// RUN: %clang -target arm-linux -mcpu=kryo -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A57 %s
+// RUN: %clang -target aarch64-linux -mcpu=kryo -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A57 %s
+
+// RUN: %clang -target arm-linux -mcpu=falkor -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A57 %s
+// RUN: %clang -target aarch64-linux -mcpu=falkor -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A57 %s
+
+// RUN: %clang -target arm-linux -mcpu=saphira -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A57 %s
+// RUN: %clang -target aarch64-linux -mcpu=saphira -### -c %s -v -fno-integrated-as 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-A57 %s
+
+// CHECK-CORTEX-A57: as{{(.exe)?}}" "{{.*}}-mcpu=cortex-a57