[clang] [Headers][X86] VectorExprEvaluator::VisitCallExpr - allow SSE/AVX2/AVX512 pack intrinsics to be used in constexpr (PR #156003)

[Simon Pilgrim via cfe-commits]

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@@ -1305,11 +1306,14 @@ let Features = "avx512f", Attributes = [NoThrow, Const, RequiredVectorWidth<512>
 
 let Features = "avx512bw", Attributes = [NoThrow, Const, RequiredVectorWidth<512>] in {
   def ucmpw512_mask : X86Builtin<"unsigned int(_Vector<32, short>, _Vector<32, short>, _Constant int, unsigned int)">;
-  def packssdw512 : X86Builtin<"_Vector<32, short>(_Vector<16, int>, _Vector<16, int>)">;
+  def pshufb512 : X86Builtin<"_Vector<64, char>(_Vector<64, char>, _Vector<64, char>)">;
+}
+
+let Features = "avx512bw,evex512", Attributes = [NoThrow, Const, Constexpr, RequiredVectorWidth<512>] in {
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RKSimon wrote:

you need to merge against trunk latest - the evex512 feature tag has been removed

https://github.com/llvm/llvm-project/pull/156003