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
@@ -6736,6 +6736,8 @@
 
 def dxc_Group : OptionGroup<"<clang-dxc options>">, Flags<[DXCOption]>,
   HelpText<"dxc compatibility options">;
+class DXCFlag<string name> : Option<["/", "-"], name, KIND_FLAG>,
+  Group<dxc_Group>, Flags<[DXCOption, NoXarchOption]>;
 class DXCJoinedOrSeparate<string name> : Option<["/", "-"], name,
   KIND_JOINED_OR_SEPARATE>, Group<dxc_Group>, Flags<[DXCOption, NoXarchOption]>;
 
@@ -6760,3 +6762,7 @@
          "lib_6_3, lib_6_4, lib_6_5, lib_6_6, lib_6_7, lib_6_x,"
          "ms_6_5, ms_6_6, ms_6_7,"
          "as_6_5, as_6_6, as_6_7">;
+def emit_pristine_llvm : DXCFlag<"emit-pristine-llvm">,
+  HelpText<"Emit pristine LLVM IR from the frontend by not running any LLVM passes at all."
+           "Same as -S + -emit-llvm + -disable-llvm-passes.">;
+def fcgl : DXCFlag<"fcgl">, Alias<emit_pristine_llvm>;
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
@@ -3470,7 +3470,9 @@
 
 static void RenderHLSLOptions(const ArgList &Args, ArgStringList &CmdArgs,
                               types::ID InputType) {
-  const unsigned ForwardedArguments[] = {options::OPT_dxil_validator_version};
+  const unsigned ForwardedArguments[] = {options::OPT_dxil_validator_version,
+                                         options::OPT_S, options::OPT_emit_llvm,
+                                         options::OPT_disable_llvm_passes};
 
   for (const auto &Arg : ForwardedArguments)
     if (const auto *A = Args.getLastArg(Arg))
diff --git a/clang/lib/Driver/ToolChains/HLSL.cpp b/clang/lib/Driver/ToolChains/HLSL.cpp
--- a/clang/lib/Driver/ToolChains/HLSL.cpp
+++ b/clang/lib/Driver/ToolChains/HLSL.cpp
@@ -169,6 +169,15 @@
       if (!isLegalValidatorVersion(ValVerStr, getDriver()))
         continue;
     }
+    if (A->getOption().getID() == options::OPT_emit_pristine_llvm) {
+      // Translate fcgl into -S -emit-llvm and -disable-llvm-passes.
+      DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_S));
+      DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_emit_llvm));
+      DAL->AddFlagArg(nullptr,
+                      Opts.getOption(options::OPT_disable_llvm_passes));
+      A->claim();
+      continue;
+    }
     DAL->append(A);
   }
   // Add default validator version if not set.
diff --git a/clang/test/Driver/dxc_fcgl.hlsl b/clang/test/Driver/dxc_fcgl.hlsl
new file mode 100644
--- /dev/null
+++ b/clang/test/Driver/dxc_fcgl.hlsl
@@ -0,0 +1,5 @@
+// RUN: %clang_dxc -fcgl foo.hlsl -### %s 2>&1 | FileCheck %s
+
+// Make sure fcgl option flag which translated into "-S" "-emit-llvm" "-disable-llvm-passes".
+// CHECK:"-S" "-emit-llvm" "-disable-llvm-passes"
+