Index: lib/Driver/ToolChains/WebAssembly.cpp
===================================================================
--- lib/Driver/ToolChains/WebAssembly.cpp
+++ lib/Driver/ToolChains/WebAssembly.cpp
@@ -124,8 +124,7 @@
                          options::OPT_fno_use_init_array, true))
     CC1Args.push_back("-fuse-init-array");
 
-  // '-pthread' implies '-target-feature +atomics' and
-  // '-target-feature +bulk-memory'
+  // '-pthread' implies '-target-feature +atomics'
   if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
                          false)) {
     if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
@@ -133,27 +132,8 @@
       getDriver().Diag(diag::err_drv_argument_not_allowed_with)
           << "-pthread"
           << "-mno-atomics";
-    if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
-                           options::OPT_mbulk_memory, false))
-      getDriver().Diag(diag::err_drv_argument_not_allowed_with)
-          << "-pthread"
-          << "-mno-bulk-memory";
     CC1Args.push_back("-target-feature");
     CC1Args.push_back("+atomics");
-    CC1Args.push_back("-target-feature");
-    CC1Args.push_back("+bulk-memory");
-  }
-
-  // '-matomics' implies '-mbulk-memory'
-  if (DriverArgs.hasFlag(options::OPT_matomics, options::OPT_mno_atomics,
-                         false)) {
-    if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
-                           options::OPT_mbulk_memory, false))
-      getDriver().Diag(diag::err_drv_argument_not_allowed_with)
-          << "-matomics"
-          << "-mno-bulk-memory";
-    CC1Args.push_back("-target-feature");
-    CC1Args.push_back("+bulk-memory");
   }
 }
 
Index: test/Driver/wasm-toolchain.c
===================================================================
--- test/Driver/wasm-toolchain.c
+++ test/Driver/wasm-toolchain.c
@@ -41,18 +41,10 @@
 
 // Thread-related command line tests.
 
-// '-pthread' sets '-target-feature +atomics' and '-target-feature +bulk-memory'
+// '-pthread' sets '-target-feature +atomics'
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread 2>&1 | FileCheck -check-prefix=PTHREAD %s
-// PTHREAD: clang{{.*}}" "-cc1" {{.*}} "-target-feature" "+atomics" "-target-feature" "+bulk-memory"
+// PTHREAD: clang{{.*}}" "-cc1" {{.*}} "-target-feature" "+atomics"
 
 // '-pthread' not allowed with '-mno-atomics'
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread -mno-atomics 2>&1 | FileCheck -check-prefix=PTHREAD_NO_ATOMICS %s
 // PTHREAD_NO_ATOMICS: invalid argument '-pthread' not allowed with '-mno-atomics'
-
-// '-pthread' not allowed with '-mno-bulk-memory'
-// RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread -mno-bulk-memory 2>&1 | FileCheck -check-prefix=PTHREAD_NO_BULKMEM %s
-// PTHREAD_NO_BULKMEM: invalid argument '-pthread' not allowed with '-mno-bulk-memory'
-
-// '-matomics' not allowed with '-mno-bulk-memory'
-// RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -matomics -mno-bulk-memory 2>&1 | FileCheck -check-prefix=ATOMICS_NO_BULKMEM %s
-// ATOMICS_NO_BULKMEM: invalid argument '-matomics' not allowed with '-mno-bulk-memory'
Index: test/Preprocessor/wasm-target-features.c
===================================================================
--- test/Preprocessor/wasm-target-features.c
+++ test/Preprocessor/wasm-target-features.c
@@ -59,8 +59,7 @@
 // RUN:     -target wasm64-unknown-unknown -matomics \
 // RUN:   | FileCheck %s -check-prefix=ATOMICS
 //
-// ATOMICS-DAG:#define __wasm_atomics__ 1{{$}}
-// ATOMICS-DAG:#define __wasm_bulk_memory__ 1{{$}}
+// ATOMICS:#define __wasm_atomics__ 1{{$}}
 
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -pthread \
@@ -69,8 +68,7 @@
 // RUN:     -target wasm64-unknown-unknown -pthread \
 // RUN:   | FileCheck %s -check-prefix=PTHREAD
 //
-// PTHREAD-DAG:#define __wasm_atomics__ 1{{$}}
-// PTHREAD-DAG:#define __wasm_bulk_memory__ 1{{$}}
+// PTHREAD:#define __wasm_atomics__ 1{{$}}
 
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -mcpu=mvp \