[clang] [X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX512 mask predicate intrinsics to be used in constexpr (PR #165054)

[Timm Baeder via cfe-commits]

================
@@ -3362,6 +3362,28 @@ static bool interp__builtin_ia32_vpconflict(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_ia32_cvt_vec2mask(InterpState &S, CodePtr OpPC,
+                                              const CallExpr *Call,
+                                              unsigned ID) {
+  assert(Call->getNumArgs() == 1);
+
+  const Pointer &Vec = S.Stk.pop<Pointer>();
+  unsigned RetWidth = S.getASTContext().getIntWidth(Call->getType());
+  APInt RetMask(RetWidth, 0);
+
+  unsigned VectorLen = Vec.getNumElems();
+  PrimType ElemT = Vec.getFieldDesc()->getPrimType();
+
+  for (unsigned ElemNum = 0; ElemNum < VectorLen; ++ElemNum) {
----------------
tbaederr wrote:

```suggestion
  for (unsigned ElemNum = 0; ElemNum != VectorLen; ++ElemNum) {
```

https://github.com/llvm/llvm-project/pull/165054