[libcxx-commits] [clang] [libcxx] [clang] Add builtin to clear padding bytes (prework for P0528R3) (PR #75371)

[Eli Friedman via libcxx-commits]

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@@ -2857,6 +2871,17 @@ struct PaddingClearer {
                          ElementQualType, /*VisitVirtualBase*/ true});
   }
 
+  void VisitVector(const clang::VectorType *VT, uint64_t StartBitOffset) {
+    ASTContext &Ctx = CGF.getContext();
+    uint64_t SizeBit = [&]() -> uint64_t {
+      if (VT->isPackedVectorBoolType(Ctx))
+        return VT->getNumElements();
+      return Ctx.getTypeInfo(VT->getElementType()).Width * VT->getNumElements();
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efriedma-quic wrote:

I think you might need to use getScalarOccupiedSizeInBits() here as well?  Consider a vector of x86 long double.

https://github.com/llvm/llvm-project/pull/75371