Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp
+++ lib/Driver/ToolChains.cpp
@@ -1783,10 +1783,13 @@
   addMultilibFlag(isMips64(TargetArch), "m64", Flags);
   addMultilibFlag(isMips16(Args), "mips16", Flags);
   addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
-  addMultilibFlag(CPUName == "mips32r2", "march=mips32r2", Flags);
+  addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
+                      CPUName == "mips32r5",
+                  "march=mips32r2", Flags);
   addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
   addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
-  addMultilibFlag(CPUName == "mips64r2" || CPUName == "octeon",
+  addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
+                      CPUName == "mips64r5" || CPUName == "octeon",
                   "march=mips64r2", Flags);
   addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
   addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
Index: test/Driver/mips-fsf.cpp
===================================================================
--- test/Driver/mips-fsf.cpp
+++ test/Driver/mips-fsf.cpp
@@ -2699,3 +2699,113 @@
 // CHECK-EL-NAN64-64R2-64-DEF: "-L[[TC]]/../../../../sysroot/mips64r2/64/el/nan2008/usr/lib"
 // CHECK-EL-NAN64-64R2-64-DEF: "[[TC]]/mips64r2/64/el/nan2008{{/|\\\\}}crtend.o"
 // CHECK-EL-NAN64-64R2-64-DEF: "[[TC]]/../../../../sysroot/mips64r2/64/el/nan2008/usr/lib{{/|\\\\}}crtn.o"
+//
+// Check that mips32r3 and mips32r5 are equal to mips32r2
+//
+// = Big-endian, mips32r3, hard float
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=mips-linux-gnu -mips32r3 -mhard-float \
+// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32R3 %s
+// CHECK-BE-HF-32R3: "-internal-isystem"
+// CHECK-BE-HF-32R3: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
+// CHECK-BE-HF-32R3: "-internal-isystem"
+// CHECK-BE-HF-32R3: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/mips-mti-linux-gnu"
+// CHECK-BE-HF-32R3: "-internal-isystem"
+// CHECK-BE-HF-32R3: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/backward"
+// CHECK-BE-HF-32R3: "-internal-externc-isystem"
+// CHECK-BE-HF-32R3: "[[TC]]/include"
+// CHECK-BE-HF-32R3: "-internal-externc-isystem"
+// CHECK-BE-HF-32R3: "[[TC]]/../../../../sysroot/usr/include"
+// CHECK-BE-HF-32R3: "{{.*}}ld{{(.exe)?}}"
+// CHECK-BE-HF-32R3: "--sysroot=[[TC]]/../../../../sysroot"
+// CHECK-BE-HF-32R3: "-dynamic-linker" "/lib/ld.so.1"
+// CHECK-BE-HF-32R3: "[[TC]]/../../../../sysroot/usr/lib/../lib{{/|\\\\}}crt1.o"
+// CHECK-BE-HF-32R3: "[[TC]]/../../../../sysroot/usr/lib/../lib{{/|\\\\}}crti.o"
+// CHECK-BE-HF-32R3: "[[TC]]{{/|\\\\}}crtbegin.o"
+// CHECK-BE-HF-32R3: "-L[[TC]]"
+// CHECK-BE-HF-32R3: "-L[[TC]]/../../../../mips-mti-linux-gnu/lib/../lib"
+// CHECK-BE-HF-32R3: "-L[[TC]]/../../../../sysroot/usr/lib/../lib"
+// CHECK-BE-HF-32R3: "[[TC]]{{/|\\\\}}crtend.o"
+// CHECK-BE-HF-32R3: "[[TC]]/../../../../sysroot/usr/lib/../lib{{/|\\\\}}crtn.o"
+//
+// = Big-endian, mips32r5, hard float
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=mips-linux-gnu -mips32r5 -mhard-float \
+// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32R5 %s
+// CHECK-BE-HF-32R5: "-internal-isystem"
+// CHECK-BE-HF-32R5: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
+// CHECK-BE-HF-32R5: "-internal-isystem"
+// CHECK-BE-HF-32R5: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/mips-mti-linux-gnu"
+// CHECK-BE-HF-32R5: "-internal-isystem"
+// CHECK-BE-HF-32R5: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/backward"
+// CHECK-BE-HF-32R5: "-internal-externc-isystem"
+// CHECK-BE-HF-32R5: "[[TC]]/include"
+// CHECK-BE-HF-32R5: "-internal-externc-isystem"
+// CHECK-BE-HF-32R5: "[[TC]]/../../../../sysroot/usr/include"
+// CHECK-BE-HF-32R5: "{{.*}}ld{{(.exe)?}}"
+// CHECK-BE-HF-32R5: "--sysroot=[[TC]]/../../../../sysroot"
+// CHECK-BE-HF-32R5: "-dynamic-linker" "/lib/ld.so.1"
+// CHECK-BE-HF-32R5: "[[TC]]/../../../../sysroot/usr/lib/../lib{{/|\\\\}}crt1.o"
+// CHECK-BE-HF-32R5: "[[TC]]/../../../../sysroot/usr/lib/../lib{{/|\\\\}}crti.o"
+// CHECK-BE-HF-32R5: "[[TC]]{{/|\\\\}}crtbegin.o"
+// CHECK-BE-HF-32R5: "-L[[TC]]"
+// CHECK-BE-HF-32R5: "-L[[TC]]/../../../../mips-mti-linux-gnu/lib/../lib"
+// CHECK-BE-HF-32R5: "-L[[TC]]/../../../../sysroot/usr/lib/../lib"
+// CHECK-BE-HF-32R5: "[[TC]]{{/|\\\\}}crtend.o"
+// CHECK-BE-HF-32R5: "[[TC]]/../../../../sysroot/usr/lib/../lib{{/|\\\\}}crtn.o"
+//
+// = Big-endian, mips64r3, ABI 64, hard float
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=mips64-linux-gnu -mips64r3 -mabi=64 -mhard-float \
+// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64R3-64 %s
+// CHECK-BE-HF-64R3-64: "-internal-isystem"
+// CHECK-BE-HF-64R3-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
+// CHECK-BE-HF-64R3-64: "-internal-isystem"
+// CHECK-BE-HF-64R3-64: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/mips-mti-linux-gnu/mips64r2/64"
+// CHECK-BE-HF-64R3-64: "-internal-isystem"
+// CHECK-BE-HF-64R3-64: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/backward"
+// CHECK-BE-HF-64R3-64: "-internal-externc-isystem"
+// CHECK-BE-HF-64R3-64: "[[TC]]/include"
+// CHECK-BE-HF-64R3-64: "-internal-externc-isystem"
+// CHECK-BE-HF-64R3-64: "[[TC]]/../../../../sysroot/usr/include"
+// CHECK-BE-HF-64R3-64: "{{.*}}ld{{(.exe)?}}"
+// CHECK-BE-HF-64R3-64: "--sysroot=[[TC]]/../../../../sysroot/mips64r2/64"
+// CHECK-BE-HF-64R3-64: "-dynamic-linker" "/lib64/ld.so.1"
+// CHECK-BE-HF-64R3-64: "[[TC]]/../../../../sysroot/mips64r2/64/usr/lib{{/|\\\\}}crt1.o"
+// CHECK-BE-HF-64R3-64: "[[TC]]/../../../../sysroot/mips64r2/64/usr/lib{{/|\\\\}}crti.o"
+// CHECK-BE-HF-64R3-64: "[[TC]]/mips64r2/64{{/|\\\\}}crtbegin.o"
+// CHECK-BE-HF-64R3-64: "-L[[TC]]/mips64r2/64"
+// CHECK-BE-HF-64R3-64: "-L[[TC]]/../../../../mips-mti-linux-gnu/lib/mips64r2/64"
+// CHECK-BE-HF-64R3-64: "-L[[TC]]/../../../../sysroot/mips64r2/64/usr/lib"
+// CHECK-BE-HF-64R3-64: "[[TC]]/mips64r2/64{{/|\\\\}}crtend.o"
+// CHECK-BE-HF-64R3-64: "[[TC]]/../../../../sysroot/mips64r2/64/usr/lib{{/|\\\\}}crtn.o"
+//
+// = Big-endian, mips64r5, ABI 64, hard float
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=mips64-linux-gnu -mips64r5 -mabi=64 -mhard-float \
+// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64R5-64 %s
+// CHECK-BE-HF-64R5-64: "-internal-isystem"
+// CHECK-BE-HF-64R5-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
+// CHECK-BE-HF-64R5-64: "-internal-isystem"
+// CHECK-BE-HF-64R5-64: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/mips-mti-linux-gnu/mips64r2/64"
+// CHECK-BE-HF-64R5-64: "-internal-isystem"
+// CHECK-BE-HF-64R5-64: "[[TC]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0/backward"
+// CHECK-BE-HF-64R5-64: "-internal-externc-isystem"
+// CHECK-BE-HF-64R5-64: "[[TC]]/include"
+// CHECK-BE-HF-64R5-64: "-internal-externc-isystem"
+// CHECK-BE-HF-64R5-64: "[[TC]]/../../../../sysroot/usr/include"
+// CHECK-BE-HF-64R5-64: "{{.*}}ld{{(.exe)?}}"
+// CHECK-BE-HF-64R5-64: "--sysroot=[[TC]]/../../../../sysroot/mips64r2/64"
+// CHECK-BE-HF-64R5-64: "-dynamic-linker" "/lib64/ld.so.1"
+// CHECK-BE-HF-64R5-64: "[[TC]]/../../../../sysroot/mips64r2/64/usr/lib{{/|\\\\}}crt1.o"
+// CHECK-BE-HF-64R5-64: "[[TC]]/../../../../sysroot/mips64r2/64/usr/lib{{/|\\\\}}crti.o"
+// CHECK-BE-HF-64R5-64: "[[TC]]/mips64r2/64{{/|\\\\}}crtbegin.o"
+// CHECK-BE-HF-64R5-64: "-L[[TC]]/mips64r2/64"
+// CHECK-BE-HF-64R5-64: "-L[[TC]]/../../../../mips-mti-linux-gnu/lib/mips64r2/64"
+// CHECK-BE-HF-64R5-64: "-L[[TC]]/../../../../sysroot/mips64r2/64/usr/lib"
+// CHECK-BE-HF-64R5-64: "[[TC]]/mips64r2/64{{/|\\\\}}crtend.o"
+// CHECK-BE-HF-64R5-64: "[[TC]]/../../../../sysroot/mips64r2/64/usr/lib{{/|\\\\}}crtn.o"