diff -r 000000000000 -r 6474c204b198 gfx/angle/src/compiler/DetectDiscontinuity.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/compiler/DetectDiscontinuity.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+//
+// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Contains analysis utilities for dealing with HLSL's lack of support for
+// the use of intrinsic functions which (implicitly or explicitly) compute
+// gradients of functions with discontinuities. 
+//
+
+#ifndef COMPILER_DETECTDISCONTINUITY_H_
+#define COMPILER_DETECTDISCONTINUITY_H_
+
+#include "compiler/intermediate.h"
+
+namespace sh
+{
+// Checks whether a loop can run for a variable number of iterations
+class DetectLoopDiscontinuity : public TIntermTraverser
+{
+  public:
+    bool traverse(TIntermNode *node);
+
+  protected:
+    bool visitBranch(Visit visit, TIntermBranch *node);
+    bool visitLoop(Visit visit, TIntermLoop *loop);
+    bool visitAggregate(Visit visit, TIntermAggregate *node);
+
+    int mLoopDepth;
+    bool mLoopDiscontinuity;
+};
+
+bool containsLoopDiscontinuity(TIntermNode *node);
+
+// Checks for intrinsic functions which compute gradients
+class DetectGradientOperation : public TIntermTraverser
+{
+  public:
+    bool traverse(TIntermNode *node);
+
+  protected:
+    bool visitUnary(Visit visit, TIntermUnary *node);
+    bool visitAggregate(Visit visit, TIntermAggregate *node);
+
+    bool mGradientOperation;
+};
+
+bool containsGradientOperation(TIntermNode *node);
+
+}
+
+#endif   // COMPILER_DETECTDISCONTINUITY_H_