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diff --git a/lib/Target/Hexagon/HexagonCallingConv.td b/lib/Target/Hexagon/HexagonCallingConv.td
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+++ b/lib/Target/Hexagon/HexagonCallingConv.td
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+//===- HexagonCallingConv.td - Calling Conventions Hexagon -*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This describes the calling conventions for the Hexagon architectures.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Return Value Calling Conventions
+//===----------------------------------------------------------------------===//
+
+// Hexagon 32-bit C return-value convention.
+def RetCC_Hexagon32 : CallingConv<[
+  CCIfType<[i32, f32], CCAssignToReg<[R0, R1, R2, R3, R4, R5]>>,
+  CCIfType<[i64, f64], CCAssignToReg<[D0, D1, D2]>>,
+
+  // Alternatively, they are assigned to the stack in 4-byte aligned units.
+  CCAssignToStack<4, 4>
+]>;
+
+// Hexagon 32-bit C Calling convention.
+def CC_Hexagon32 : CallingConv<[
+  // All arguments get passed in integer registers if there is space.
+  CCIfType<[f32, i32, i16, i8], CCAssignToReg<[R0, R1, R2, R3, R4, R5]>>,
+  CCIfType<[f64, i64], CCAssignToReg<[D0, D1, D2]>>,
+
+  // Alternatively, they are assigned to the stack in 4-byte aligned units.
+  CCAssignToStack<4, 4>
+]>;