Revert "[DirectX] Validating Root flags are denying shader stage"

llvm/lib/Target/DirectX/DXILPostOptimizationValidation.cpp

@@ -160,41 +160,6 @@ tripleToVisibility(llvm::Triple::EnvironmentType ET) {
   }
 }
 
-static void reportIfDeniedShaderStageAccess(Module &M,
-                                            const dxbc::RootFlags &Flags,
-                                            const dxbc::RootFlags &Mask) {
-  if ((Flags & Mask) != Mask)
-    return;
-
-  SmallString<128> Message;
-  raw_svector_ostream OS(Message);
-  OS << "Shader has root bindings but root signature uses a DENY flag to "
-        "disallow root binding access to the shader stage.";
-  M.getContext().diagnose(DiagnosticInfoGeneric(Message));
-}
-
-static std::optional<dxbc::RootFlags>
-getEnvironmentDenyFlagMask(Triple::EnvironmentType ShaderProfile) {
-  switch (ShaderProfile) {
-  case Triple::Pixel:
-    return dxbc::RootFlags::DenyPixelShaderRootAccess;
-  case Triple::Vertex:
-    return dxbc::RootFlags::DenyVertexShaderRootAccess;
-  case Triple::Geometry:
-    return dxbc::RootFlags::DenyGeometryShaderRootAccess;
-  case Triple::Hull:
-    return dxbc::RootFlags::DenyHullShaderRootAccess;
-  case Triple::Domain:
-    return dxbc::RootFlags::DenyDomainShaderRootAccess;
-  case Triple::Mesh:
-    return dxbc::RootFlags::DenyMeshShaderRootAccess;
-  case Triple::Amplification:
-    return dxbc::RootFlags::DenyAmplificationShaderRootAccess;
-  default:
-    return std::nullopt;
-  }
-}
-
 static void validateRootSignature(Module &M,
                                   const mcdxbc::RootSignatureDesc &RSD,
                                   dxil::ModuleMetadataInfo &MMI,
@@ -260,9 +225,7 @@ static void validateRootSignature(Module &M,
             Builder.findOverlapping(ReportedBinding);
         reportOverlappingRegisters(M, ReportedBinding, Overlaping);
       });
-
   const hlsl::BoundRegs &BoundRegs = Builder.takeBoundRegs();
-  bool HasBindings = false;
   for (const ResourceInfo &RI : DRM) {
     const ResourceInfo::ResourceBinding &Binding = RI.getBinding();
     const dxil::ResourceTypeInfo &RTI = DRTM[RI.getHandleTy()];
@@ -273,33 +236,22 @@ static void validateRootSignature(Module &M,
         BoundRegs.findBoundReg(RC, Binding.Space, Binding.LowerBound,
                                Binding.LowerBound + Binding.Size - 1);
 
-    if (!Reg) {
-      reportRegNotBound(M, RC, Binding);
-      continue;
-    }
+    if (Reg != nullptr) {
+      const auto *ParamInfo =
+          static_cast<const mcdxbc::RootParameterInfo *>(Reg->Cookie);
+
+      if (RC != ResourceClass::SRV && RC != ResourceClass::UAV)
+        continue;
 
-    const auto *ParamInfo =
-        static_cast<const mcdxbc::RootParameterInfo *>(Reg->Cookie);
+      if (ParamInfo->Type == dxbc::RootParameterType::DescriptorTable)
+        continue;
 
-    bool IsSRVOrUAV = RC == ResourceClass::SRV || RC == ResourceClass::UAV;
-    bool IsDescriptorTable =
-        ParamInfo->Type == dxbc::RootParameterType::DescriptorTable;
-    bool IsRawOrStructuredBuffer =
-        RK != ResourceKind::RawBuffer && RK != ResourceKind::StructuredBuffer;
-    if (IsSRVOrUAV && !IsDescriptorTable && IsRawOrStructuredBuffer) {
-      reportInvalidHandleTyError(M, RC, Binding);
-      continue;
+      if (RK != ResourceKind::RawBuffer && RK != ResourceKind::StructuredBuffer)
+        reportInvalidHandleTyError(M, RC, Binding);
+    } else {
+      reportRegNotBound(M, RC, Binding);
     }
-
-    HasBindings = true;
   }
-
-  if (!HasBindings)
-    return;
-
-  if (std::optional<dxbc::RootFlags> Mask =
-          getEnvironmentDenyFlagMask(MMI.ShaderProfile))
-    reportIfDeniedShaderStageAccess(M, dxbc::RootFlags(RSD.Flags), *Mask);
 }
 
 static mcdxbc::RootSignatureDesc *