[clang] [X86] Allow PSHUFD/PSHUFLW/PSHUFW intrinsics in constexpr. (PR #161210)

[Simon Pilgrim via cfe-commits]

================
@@ -2016,21 +2024,35 @@ let Features = "avx512f",
 
 let Features = "avx512bw", Attributes = [NoThrow, Const, Constexpr, RequiredVectorWidth<512>] in {
   def psrlv32hi : X86Builtin<"_Vector<32, short>(_Vector<32, short>, _Vector<32, short>)">;
+  def pshuflw512_mask  : X86Builtin<"_Vector<32, short>(_Vector<32, short>, _Constant int, _Vector<32, short>, unsigned int)">;
+  def pshuflw512_maskz : X86Builtin<"_Vector<32, short>(_Vector<32, short>, _Constant int, unsigned int)">;
+  def pshufhw512_mask  : X86Builtin<"_Vector<32, short>(_Vector<32, short>, _Constant int, _Vector<32, short>, unsigned int)">;
+  def pshufhw512_maskz : X86Builtin<"_Vector<32, short>(_Vector<32, short>, _Constant int, unsigned int)">;
 }
 
 let Features = "avx512bw,avx512vl", Attributes = [NoThrow, Const, Constexpr, RequiredVectorWidth<256>] in {
   def psrlv16hi : X86Builtin<"_Vector<16, short>(_Vector<16, short>, _Vector<16, short>)">;
+  def pshuflw256_mask  : X86Builtin<"_Vector<16, short>(_Vector<16, short>, _Constant int, _Vector<16, short>, unsigned short)">;
+  def pshuflw256_maskz : X86Builtin<"_Vector<16, short>(_Vector<16, short>, _Constant int, unsigned short)">;
+  def pshufhw256_mask  : X86Builtin<"_Vector<16, short>(_Vector<16, short>, _Constant int, _Vector<16, short>, unsigned short)">;
+  def pshufhw256_maskz : X86Builtin<"_Vector<16, short>(_Vector<16, short>, _Constant int, unsigned short)">;
 }
 
 let Features = "avx512bw,avx512vl", Attributes = [NoThrow, Const, Constexpr, RequiredVectorWidth<128>] in {
   def psrlv8hi : X86Builtin<"_Vector<8, short>(_Vector<8, short>, _Vector<8, short>)">;
+  def pshuflw128_mask  : X86Builtin<"_Vector<8, short>(_Vector<8, short>, _Constant int, _Vector<8, short>, unsigned char)">;
+  def pshuflw128_maskz : X86Builtin<"_Vector<8, short>(_Vector<8, short>, _Constant int, unsigned char)">;
+  def pshufhw128_mask  : X86Builtin<"_Vector<8, short>(_Vector<8, short>, _Constant int, _Vector<8, short>, unsigned char)">;
+  def pshufhw128_maskz : X86Builtin<"_Vector<8, short>(_Vector<8, short>, _Constant int, unsigned char)">;
----------------
RKSimon wrote:

why did you add these?

https://github.com/llvm/llvm-project/pull/161210