[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - add AVX512 VPTERNLOGD/VPTERNLOGQ intrinsics to be used in constexpr (PR #158703)

[Timm Baeder via cfe-commits]

================
@@ -2903,6 +2903,55 @@ static bool interp__builtin_elementwise_triop(
   return true;
 }
 
+static bool interp__builtin_pternlog(InterpState &S, CodePtr OpPC,
+                                     const CallExpr *Call, bool MaskZ) {
+  assert(Call->getNumArgs() == 5);
+
+  const VectorType *VecT = Call->getArg(0)->getType()->castAs<VectorType>();
+  unsigned DstLen = VecT->getNumElements();
+  PrimType DstElemT = *S.getContext().classify(VecT->getElementType());
+
+  APSInt U = popToAPSInt(S.Stk, *S.getContext().classify(Call->getArg(4)));
+  APSInt Imm = popToAPSInt(S.Stk, *S.getContext().classify(Call->getArg(3)));
+  const Pointer &C = S.Stk.pop<Pointer>();
+  const Pointer &B = S.Stk.pop<Pointer>();
+  const Pointer &A = S.Stk.pop<Pointer>();
+
+  const Pointer &Dst = S.Stk.peek<Pointer>();
+
+  for (unsigned I = 0; I < DstLen; ++I) {
----------------
tbaederr wrote:

```suggestion
  for (unsigned I = 0; I != DstLen; ++I) {
```

https://github.com/llvm/llvm-project/pull/158703