diff --git a/clang/test/Preprocessor/predefined-arch-macros.c b/clang/test/Preprocessor/predefined-arch-macros.c
index a0eb8cbcca9a..08f4d2573f40 100644
--- a/clang/test/Preprocessor/predefined-arch-macros.c
+++ b/clang/test/Preprocessor/predefined-arch-macros.c
@@ -1601,6 +1601,7 @@
 // CHECK_BDVER1_M32: #define __AES__ 1
 // CHECK_BDVER1_M32: #define __AVX__ 1
 // CHECK_BDVER1_M32: #define __FMA4__ 1
+// CHECK_BDVER1_M32: #define __LWP__ 1
 // CHECK_BDVER1_M32: #define __LZCNT__ 1
 // CHECK_BDVER1_M32: #define __MMX__ 1
 // CHECK_BDVER1_M32: #define __PCLMUL__ 1
@@ -1630,6 +1631,7 @@
 // CHECK_BDVER1_M64: #define __AES__ 1
 // CHECK_BDVER1_M64: #define __AVX__ 1
 // CHECK_BDVER1_M64: #define __FMA4__ 1
+// CHECK_BDVER1_M64: #define __LWP__ 1
 // CHECK_BDVER1_M64: #define __LZCNT__ 1
 // CHECK_BDVER1_M64: #define __MMX__ 1
 // CHECK_BDVER1_M64: #define __PCLMUL__ 1
@@ -1664,6 +1666,7 @@
 // CHECK_BDVER2_M32: #define __F16C__ 1
 // CHECK_BDVER2_M32: #define __FMA4__ 1
 // CHECK_BDVER2_M32: #define __FMA__ 1
+// CHECK_BDVER2_M32: #define __LWP__ 1
 // CHECK_BDVER2_M32: #define __LZCNT__ 1
 // CHECK_BDVER2_M32: #define __MMX__ 1
 // CHECK_BDVER2_M32: #define __PCLMUL__ 1
@@ -1697,6 +1700,7 @@
 // CHECK_BDVER2_M64: #define __F16C__ 1
 // CHECK_BDVER2_M64: #define __FMA4__ 1
 // CHECK_BDVER2_M64: #define __FMA__ 1
+// CHECK_BDVER2_M64: #define __LWP__ 1
 // CHECK_BDVER2_M64: #define __LZCNT__ 1
 // CHECK_BDVER2_M64: #define __MMX__ 1
 // CHECK_BDVER2_M64: #define __PCLMUL__ 1
@@ -1733,6 +1737,7 @@
 // CHECK_BDVER3_M32: #define __FMA4__ 1
 // CHECK_BDVER3_M32: #define __FMA__ 1
 // CHECK_BDVER3_M32: #define __FSGSBASE__ 1
+// CHECK_BDVER3_M32: #define __LWP__ 1
 // CHECK_BDVER3_M32: #define __LZCNT__ 1
 // CHECK_BDVER3_M32: #define __MMX__ 1
 // CHECK_BDVER3_M32: #define __PCLMUL__ 1
@@ -1768,6 +1773,7 @@
 // CHECK_BDVER3_M64: #define __FMA4__ 1
 // CHECK_BDVER3_M64: #define __FMA__ 1
 // CHECK_BDVER3_M64: #define __FSGSBASE__ 1
+// CHECK_BDVER3_M64: #define __LWP__ 1
 // CHECK_BDVER3_M64: #define __LZCNT__ 1
 // CHECK_BDVER3_M64: #define __MMX__ 1
 // CHECK_BDVER3_M64: #define __PCLMUL__ 1
@@ -1807,6 +1813,7 @@
 // CHECK_BDVER4_M32: #define __FMA4__ 1
 // CHECK_BDVER4_M32: #define __FMA__ 1
 // CHECK_BDVER4_M32: #define __FSGSBASE__ 1
+// CHECK_BDVER4_M32: #define __LWP__ 1
 // CHECK_BDVER4_M32: #define __LZCNT__ 1
 // CHECK_BDVER4_M32: #define __MMX__ 1
 // CHECK_BDVER4_M32: #define __PCLMUL__ 1
@@ -1843,6 +1850,7 @@
 // CHECK_BDVER4_M64: #define __FMA4__ 1
 // CHECK_BDVER4_M64: #define __FMA__ 1
 // CHECK_BDVER4_M64: #define __FSGSBASE__ 1
+// CHECK_BDVER4_M64: #define __LWP__ 1
 // CHECK_BDVER4_M64: #define __LZCNT__ 1
 // CHECK_BDVER4_M64: #define __MMX__ 1
 // CHECK_BDVER4_M64: #define __PCLMUL__ 1
diff --git a/clang/test/Preprocessor/x86_target_features.c b/clang/test/Preprocessor/x86_target_features.c
index a201900ba762..ce3835f91f42 100644
--- a/clang/test/Preprocessor/x86_target_features.c
+++ b/clang/test/Preprocessor/x86_target_features.c
@@ -272,6 +272,14 @@
 // AESNOSSE2-NOT: #define __SSE2__ 1
 // AESNOSSE2-NOT: #define __SSE3__ 1
 
+// RUN: %clang -target i386-unknown-unknown -march=pentiumpro -mlwp -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=LWP %s
+
+// LWP: #define __LWP__ 1
+
+// RUN: %clang -target i386-unknown-unknown -march=bdver1 -mno-lwp -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=NOLWP %s
+
+// NOLWP-NOT: #define __LWP__ 1
+
 // RUN: %clang -target i386-unknown-unknown -march=pentiumpro -msha -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=SHA %s
 
 // SHA: #define __SHA__ 1