Index: lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
+++ lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
@@ -209,16 +209,28 @@
   unsigned EFlags = 0;
 
   // Architecture
-  if (Features & Mips::FeatureMips64r2)
+  if (Features & Mips::FeatureMips64r6)
+    EFlags |= ELF::EF_MIPS_ARCH_64R6;
+  else if (Features & Mips::FeatureMips64r2)
     EFlags |= ELF::EF_MIPS_ARCH_64R2;
   else if (Features & Mips::FeatureMips64)
     EFlags |= ELF::EF_MIPS_ARCH_64;
+  else if (Features & Mips::FeatureMips5)
+    EFlags |= ELF::EF_MIPS_ARCH_5;
   else if (Features & Mips::FeatureMips4)
     EFlags |= ELF::EF_MIPS_ARCH_4;
+  else if (Features & Mips::FeatureMips3)
+    EFlags |= ELF::EF_MIPS_ARCH_3;
+  else if (Features & Mips::FeatureMips32r6)
+    EFlags |= ELF::EF_MIPS_ARCH_32R6;
   else if (Features & Mips::FeatureMips32r2)
     EFlags |= ELF::EF_MIPS_ARCH_32R2;
   else if (Features & Mips::FeatureMips32)
     EFlags |= ELF::EF_MIPS_ARCH_32;
+  else if (Features & Mips::FeatureMips2)
+    EFlags |= ELF::EF_MIPS_ARCH_2;
+  else
+    EFlags |= ELF::EF_MIPS_ARCH_1;
 
   if (T.isArch64Bit()) {
     if (Features & Mips::FeatureN32)
Index: test/MC/Mips/elf_eflags.s
===================================================================
--- test/MC/Mips/elf_eflags.s
+++ test/MC/Mips/elf_eflags.s
@@ -1,6 +1,12 @@
 # These *MUST* match the output of gas compiled with the same triple and
 # corresponding options (-mcpu=mips32 -> -mips32 for example).
 
+# RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips64r6 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS64R6 %s
+# MIPSEL-MIPS64R6: Flags [ (0xA0001500)
+
+# RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips64r6 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS64R6-NAN2008 %s
+# MIPSEL-MIPS64R6-NAN2008: Flags [ (0xA0001500)
+
 # RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips64r2 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS64R2 %s
 # MIPSEL-MIPS64R2: Flags [ (0x80001100)
 
@@ -13,6 +19,12 @@
 # RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips64 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS64-NAN2008 %s
 # MIPSEL-MIPS64-NAN2008: Flags [ (0x60001500)
 
+# RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips32r6 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS32R6 %s
+# MIPSEL-MIPS32R6: Flags [ (0x90001400)
+
+# RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips32r6 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS32R6-NAN2008 %s
+# MIPSEL-MIPS32R6-NAN2008: Flags [ (0x90001400)
+
 # RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips32r2 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS32R2 %s
 # MIPSEL-MIPS32R2: Flags [ (0x70001000)
 
@@ -55,12 +67,36 @@
 # RUN: llvm-mc -filetype=obj -triple mips64el-unknown-linux -mcpu=mips64r2 -mattr=-n64,o32,+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS64EL-MIPS64R2-O32-NAN2008 %s
 # MIPS64EL-MIPS64R2-O32-NAN2008: Flags [ (0x80001500)
 
+# RUN: llvm-mc -filetype=obj -triple mips64-unknown-linux -mcpu=mips5 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS5 %s
+# MIPS5: Flags [ (0x40000000)
+
+ # RUN: llvm-mc -filetype=obj -triple mips64-unknown-linux -mcpu=mips5 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS5-NAN2008 %s
+# MIPS5-NAN2008: Flags [ (0x40000400)
+
 # RUN: llvm-mc -filetype=obj -triple mips64-unknown-linux -mcpu=mips4 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS4 %s
 # MIPS4: Flags [ (0x30000000)
 
  # RUN: llvm-mc -filetype=obj -triple mips64-unknown-linux -mcpu=mips4 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS4-NAN2008 %s
 # MIPS4-NAN2008: Flags [ (0x30000400)
 
+# RUN: llvm-mc -filetype=obj -triple mips64-unknown-linux -mcpu=mips3 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS3 %s
+# MIPS3: Flags [ (0x20000000)
+
+ # RUN: llvm-mc -filetype=obj -triple mips64-unknown-linux -mcpu=mips3 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS3-NAN2008 %s
+# MIPS3-NAN2008: Flags [ (0x20000400)
+
+# RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips2 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS2 %s
+# MIPSEL-MIPS2: Flags [ (0x10001000)
+
+# RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux -mcpu=mips2 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPSEL-MIPS2-NAN2008 %s
+# MIPSEL-MIPS2-NAN2008: Flags [ (0x10001400)
+
+# RUN: llvm-mc -filetype=obj -triple mips-unknown-linux -mcpu=mips1 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS1 %s
+# MIPS1: Flags [ (0x1000)
+
+ # RUN: llvm-mc -filetype=obj -triple mips-unknown-linux -mcpu=mips1 -mattr=+nan2008 %s -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS1-NAN2008 %s
+# MIPS1-NAN2008: Flags [ (0x1400)
+
 # RUN: llvm-mc -filetype=obj -triple mips64el-unknown-linux -mcpu=mips64 %s -mattr=-n64,o32 -o -| llvm-readobj -h | FileCheck --check-prefix=MIPS64EL-MIPS64-O32 %s
 # MIPS64EL-MIPS64-O32: Flags [ (0x60001100)