Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp
+++ lib/Driver/ToolChains.cpp
@@ -4736,7 +4736,7 @@
     Res |= SanitizerKind::Thread;
   if (IsX86_64 || IsMIPS64 || IsPowerPC64 || IsAArch64)
     Res |= SanitizerKind::Memory;
-  if (IsX86_64)
+  if (IsX86_64 || IsMIPS64)
     Res |= SanitizerKind::Efficiency;
   if (IsX86 || IsX86_64) {
     Res |= SanitizerKind::Function;
Index: test/Driver/esan.c
===================================================================
--- test/Driver/esan.c
+++ test/Driver/esan.c
@@ -6,6 +6,10 @@
 // RUN: %clang -O1 -target x86_64-unknown-linux -fsanitize=efficiency-working-set %s -S -emit-llvm -o - | FileCheck %s
 // RUN: %clang -O2 -target x86_64-unknown-linux -fsanitize=efficiency-working-set %s -S -emit-llvm -o - | FileCheck %s
 // RUN: %clang -O3 -target x86_64-unknown-linux -fsanitize=efficiency-working-set %s -S -emit-llvm -o - | FileCheck %s
+// RUN: %clang -target mips64-unknown-linux -fsanitize=efficiency-cache-frag %s -S -emit-llvm -o - | FileCheck %s
+// RUN: %clang -target mips64-unknown-linux -fsanitize=efficiency-working-set %s -S -emit-llvm -o - | FileCheck %s
+// RUN: %clang -target mips64el-unknown-linux -fsanitize=efficiency-cache-frag %s -S -emit-llvm -o - | FileCheck %s
+// RUN: %clang -target mips64el-unknown-linux -fsanitize=efficiency-working-set %s -S -emit-llvm -o - | FileCheck %s
 // Verify that -fsanitize=efficiency-* invokes esan instrumentation.
 
 int foo(int *a) { return *a; }