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diff --git a/contrib/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.h b/contrib/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.h
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index 000000000000..4ef9959f7a27
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+++ b/contrib/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.h
@@ -0,0 +1,166 @@
+//===-- X86ShuffleDecode.h - X86 shuffle decode logic -----------*-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 into a
+// generic vector mask.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_X86_UTILS_X86SHUFFLEDECODE_H
+#define LLVM_LIB_TARGET_X86_UTILS_X86SHUFFLEDECODE_H
+
+#include <cstdint>
+
+//===----------------------------------------------------------------------===//
+//  Vector Mask Decoding
+//===----------------------------------------------------------------------===//
+
+namespace llvm {
+class APInt;
+template <typename T> class ArrayRef;
+template <typename T> class SmallVectorImpl;
+
+enum { SM_SentinelUndef = -1, SM_SentinelZero = -2 };
+
+/// Decode a 128-bit INSERTPS instruction as a v4f32 shuffle mask.
+void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
+
+// Insert the bottom Len elements from a second source into a vector starting at
+// element Idx.
+void DecodeInsertElementMask(unsigned NumElts, unsigned Idx, unsigned Len,
+                             SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a MOVHLPS instruction as a v2f64/v4f32 shuffle mask.
+/// i.e. <3,1> or <6,7,2,3>
+void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a MOVLHPS instruction as a v2f64/v4f32 shuffle mask.
+/// i.e. <0,2> or <0,1,4,5>
+void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask);
+
+void DecodeMOVSLDUPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask);
+
+void DecodeMOVSHDUPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask);
+
+void DecodeMOVDDUPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask);
+
+void DecodePSLLDQMask(unsigned NumElts, unsigned Imm,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+void DecodePSRLDQMask(unsigned NumElts, unsigned Imm,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+void DecodePALIGNRMask(unsigned NumElts, unsigned Imm,
+                       SmallVectorImpl<int> &ShuffleMask);
+
+void DecodeVALIGNMask(unsigned NumElts, unsigned Imm,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for pshufd/pshufw/vpermilpd/vpermilps.
+void DecodePSHUFMask(unsigned NumElts, unsigned ScalarBits, unsigned Imm,
+                     SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for pshufhw.
+void DecodePSHUFHWMask(unsigned NumElts, unsigned Imm,
+                       SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for pshuflw.
+void DecodePSHUFLWMask(unsigned NumElts, unsigned Imm,
+                       SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes a PSWAPD 3DNow! instruction.
+void DecodePSWAPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for shufp*.
+void DecodeSHUFPMask(unsigned NumElts, unsigned ScalarBits, unsigned Imm,
+                     SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for unpckhps/unpckhpd and punpckh*.
+void DecodeUNPCKHMask(unsigned NumElts, unsigned ScalarBits,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for unpcklps/unpcklpd and punpckl*.
+void DecodeUNPCKLMask(unsigned NumElts, unsigned ScalarBits,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes a broadcast of the first element of a vector.
+void DecodeVectorBroadcast(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes a broadcast of a subvector to a larger vector type.
+void DecodeSubVectorBroadcast(unsigned DstNumElts, unsigned SrcNumElts,
+                              SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a PSHUFB mask from a raw array of constants such as from
+/// BUILD_VECTOR.
+void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a BLEND immediate mask into a shuffle mask.
+void DecodeBLENDMask(unsigned NumElts, unsigned Imm,
+                     SmallVectorImpl<int> &ShuffleMask);
+
+void DecodeVPERM2X128Mask(unsigned NumElts, unsigned Imm,
+                          SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a shuffle packed values at 128-bit granularity
+/// (SHUFF32x4/SHUFF64x2/SHUFI32x4/SHUFI64x2)
+/// immediate mask into a shuffle mask.
+void decodeVSHUF64x2FamilyMask(unsigned NumElts, unsigned ScalarSize,
+                               unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
+
+/// Decodes the shuffle masks for VPERMQ/VPERMPD.
+void DecodeVPERMMask(unsigned NumElts, unsigned Imm,
+                     SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPPERM mask from a raw array of constants such as from
+/// BUILD_VECTOR.
+/// This can only basic masks (permutes + zeros), not any of the other
+/// operations that VPPERM can perform.
+void DecodeVPPERMMask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a zero extension instruction as a shuffle mask.
+void DecodeZeroExtendMask(unsigned SrcScalarBits, unsigned DstScalarBits,
+                          unsigned NumDstElts, bool IsAnyExtend,
+                          SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a move lower and zero upper instruction as a shuffle mask.
+void DecodeZeroMoveLowMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a scalar float move instruction as a shuffle mask.
+void DecodeScalarMoveMask(unsigned NumElts, bool IsLoad,
+                          SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a SSE4A EXTRQ instruction as a shuffle mask.
+void DecodeEXTRQIMask(unsigned NumElts, unsigned EltSize, int Len, int Idx,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a SSE4A INSERTQ instruction as a shuffle mask.
+void DecodeINSERTQIMask(unsigned NumElts, unsigned EltSize, int Len, int Idx,
+                        SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERMILPD/VPERMILPS variable mask from a raw array of constants.
+void DecodeVPERMILPMask(unsigned NumElts, unsigned ScalarBits,
+                        ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+                        SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERMIL2PD/VPERMIL2PS variable mask from a raw array of constants.
+void DecodeVPERMIL2PMask(unsigned NumElts, unsigned ScalarBits, unsigned M2Z,
+                         ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+                         SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERM W/D/Q/PS/PD mask from a raw array of constants.
+void DecodeVPERMVMask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+                      SmallVectorImpl<int> &ShuffleMask);
+
+/// Decode a VPERMT2 W/D/Q/PS/PD mask from a raw array of constants.
+void DecodeVPERMV3Mask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+                      SmallVectorImpl<int> &ShuffleMask);
+} // llvm namespace
+
+#endif