+/// \brief Decode a PSHUFB mask from an IR-level vector constant.
+void DecodePSHUFBMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask);
+
+/// \brief Decode a PSHUFB mask from a raw array of constants such as from
+/// BUILD_VECTOR.
+void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask,
+ SmallVectorImpl<int> &ShuffleMask);
+
+/// \brief Decode a BLEND immediate mask into a shuffle mask.
+void DecodeBLENDMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);