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diff --git a/llvm/lib/Target/X86/X86ShuffleDecodeConstantPool.h b/llvm/lib/Target/X86/X86ShuffleDecodeConstantPool.h
new file mode 100644
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+++ b/llvm/lib/Target/X86/X86ShuffleDecodeConstantPool.h
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+//===-- X86ShuffleDecodeConstantPool.h - X86 shuffle decode -----*-C++-*---===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Define several functions to decode x86 specific shuffle semantics using
+// constants from the constant pool.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_X86_X86SHUFFLEDECODECONSTANTPOOL_H
+#define LLVM_LIB_TARGET_X86_X86SHUFFLEDECODECONSTANTPOOL_H
+
+#include "llvm/ADT/SmallVector.h"
+
+//===----------------------------------------------------------------------===//
+//  Vector Mask Decoding
+//===----------------------------------------------------------------------===//
+
+namespace llvm {
+class Constant;
+class MVT;
+
+/// Decode a PSHUFB mask from an IR-level vector constant.
+void DecodePSHUFBMask(const Constant *C, unsigned Width,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERMILP variable mask from an IR-level vector constant.
+void DecodeVPERMILPMask(const Constant *C, unsigned ElSize, unsigned Width,
+                        SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERMILP2 variable mask from an IR-level vector constant.
+void DecodeVPERMIL2PMask(const Constant *C, unsigned MatchImm, unsigned ElSize,
+                         unsigned Width,
+                         SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPPERM variable mask from an IR-level vector constant.
+void DecodeVPPERMMask(const Constant *C, unsigned Width,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERM W/D/Q/PS/PD mask from an IR-level vector constant.
+void DecodeVPERMVMask(const Constant *C, unsigned ElSize, unsigned Width,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERMT2 W/D/Q/PS/PD mask from an IR-level vector constant.
+void DecodeVPERMV3Mask(const Constant *C, unsigned ElSize, unsigned Width,
+                       SmallVectorImpl<int> &ShuffleMask);
+
+} // llvm namespace
+
+#endif