1 files changed, 34 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/tree_ops/d3d/ExpandIntegerPowExpressions.h b/gfx/angle/checkout/src/compiler/translator/tree_ops/d3d/ExpandIntegerPowExpressions.h
new file mode 100644
index 0000000000..2404fb08ac
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/tree_ops/d3d/ExpandIntegerPowExpressions.h
@@ -0,0 +1,34 @@
+//
+// Copyright 2016 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.
+//
+// This mutating tree traversal works around a bug in the HLSL compiler optimizer with "pow" that
+// manifests under the following conditions:
+//
+// - If pow() has a literal exponent value
+// - ... and this value is integer or within 10e-6 of an integer
+// - ... and it is in {-4, -3, -2, 2, 3, 4, 5, 6, 7, 8}
+//
+// The workaround is to replace the pow with a series of multiplies.
+// See http://anglebug.com/851
+
+#ifndef COMPILER_TRANSLATOR_TREEOPS_D3D_EXPANDINTEGERPOWEXPRESSIONS_H_
+#define COMPILER_TRANSLATOR_TREEOPS_D3D_EXPANDINTEGERPOWEXPRESSIONS_H_
+
+#include "common/angleutils.h"
+
+namespace sh
+{
+
+class TCompiler;
+class TIntermNode;
+class TSymbolTable;
+
+[[nodiscard]] bool ExpandIntegerPowExpressions(TCompiler *compiler,
+                                               TIntermNode *root,
+                                               TSymbolTable *symbolTable);
+
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_TREEOPS_D3D_EXPANDINTEGERPOWEXPRESSIONS_H_