diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def
--- a/clang/include/clang/Basic/CodeGenOptions.def
+++ b/clang/include/clang/Basic/CodeGenOptions.def
@@ -180,6 +180,7 @@
 CODEGENOPT(FatalWarnings     , 1, 0) ///< Set when -Wa,--fatal-warnings is
                                      ///< enabled.
 CODEGENOPT(NoWarn            , 1, 0) ///< Set when -Wa,--no-warn is enabled.
+CODEGENOPT(NoTypeCheck       , 1, 0) ///< Set when -Wa,--no-type-check is enabled.
 CODEGENOPT(MisExpect         , 1, 0) ///< Set when -Wmisexpect is enabled
 CODEGENOPT(EnableSegmentedStacks , 1, 0) ///< Set when -fsplit-stack is enabled.
 CODEGENOPT(NoInlineLineTables, 1, 0) ///< Whether debug info should contain
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -5286,6 +5286,9 @@
            "Note this may change .s semantics and shouldn't generally be used "
            "on compiler-generated code.">,
   MarshallingInfoFlag<CodeGenOpts<"SaveTempLabels">>;
+def mno_type_check : Flag<["-"], "mno-type-check">,
+  HelpText<"Don't perform type checking of the assembly code (wasm only)">,
+  MarshallingInfoFlag<CodeGenOpts<"NoTypeCheck">>;
 def fno_math_builtin : Flag<["-"], "fno-math-builtin">,
   HelpText<"Disable implicit builtin knowledge of math functions">,
   MarshallingInfoFlag<LangOpts<"NoMathBuiltin">>;
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2580,6 +2580,13 @@
       switch (C.getDefaultToolChain().getArch()) {
       default:
         break;
+      case llvm::Triple::wasm32:
+      case llvm::Triple::wasm64:
+        if (Value == "--no-type-check") {
+          CmdArgs.push_back("-mno-type-check");
+          continue;
+        }
+        break;
       case llvm::Triple::thumb:
       case llvm::Triple::thumbeb:
       case llvm::Triple::arm:
diff --git a/clang/test/Driver/notypecheck.s b/clang/test/Driver/notypecheck.s
new file mode 100644
--- /dev/null
+++ b/clang/test/Driver/notypecheck.s
@@ -0,0 +1,13 @@
+# REQUIRES: webassembly-registered-target
+
+# RUN: %clang -### %s -c -o tmp.o -target wasm32-unknown-unknown -Wa,--no-type-check 2>&1 | FileCheck %s
+# CHECK: "-cc1as" {{.*}} "-mno-type-check"
+
+# Verify that without -Wa,--no-type-check the assembler will error out
+# RUN: not %clang %s -c -o tmp.o -target wasm32-unknown-unknown 2>&1 | FileCheck --check-prefix=ERROR %s
+# ERROR: error: popped i64, expected i32
+
+foo:
+  .functype  foo () -> (i32)
+  i64.const 42
+  end_function
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -134,6 +134,7 @@
   unsigned NoExecStack : 1;
   unsigned FatalWarnings : 1;
   unsigned NoWarn : 1;
+  unsigned NoTypeCheck : 1;
   unsigned IncrementalLinkerCompatible : 1;
   unsigned EmbedBitcode : 1;
 
@@ -166,6 +167,7 @@
     NoExecStack = 0;
     FatalWarnings = 0;
     NoWarn = 0;
+    NoTypeCheck = 0;
     IncrementalLinkerCompatible = 0;
     Dwarf64 = 0;
     DwarfVersion = 0;
@@ -304,6 +306,7 @@
   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
   Opts.NoWarn = Args.hasArg(OPT_massembler_no_warn);
+  Opts.NoTypeCheck = Args.hasArg(OPT_mno_type_check);
   Opts.RelocationModel =
       std::string(Args.getLastArgValue(OPT_mrelocation_model, "pic"));
   Opts.TargetABI = std::string(Args.getLastArgValue(OPT_target_abi));
@@ -468,6 +471,7 @@
 
   MCOptions.MCNoWarn = Opts.NoWarn;
   MCOptions.MCFatalWarnings = Opts.FatalWarnings;
+  MCOptions.MCNoTypeCheck = Opts.NoTypeCheck;
   MCOptions.ABIName = Opts.TargetABI;
 
   // FIXME: There is a bit of code duplication with addPassesToEmitFile.