================
@@ -3359,6 +3391,143 @@ static bool 
interp__builtin_ia32_cvt_vec2mask(InterpState &S, CodePtr OpPC,
   pushInteger(S, RetMask, Call->getType());
   return true;
 }
+static bool interp__builtin_ia32_cvtsd2ss(InterpState &S, CodePtr OpPC,
+                                          const CallExpr *Call) {
+  assert(Call->getNumArgs() == 2);
+
+  const Pointer &B = S.Stk.pop<Pointer>();
+  const Pointer &A = S.Stk.pop<Pointer>();
+  if (!CheckLoad(S, OpPC, A) || !CheckLoad(S, OpPC, B))
+    return false;
+
+  const auto *DstVTy = Call->getType()->castAs<VectorType>();
+  unsigned NumElems = DstVTy->getNumElements();
+  const Pointer &Dst = S.Stk.peek<Pointer>();
+
+  // Copy all elements from A to Dst
+  for (unsigned I = 0; I != NumElems; ++I)
+    Dst.elem<Floating>(I) = A.elem<Floating>(I);
+
+  // Convert element 0 from double to float
+  Floating Conv = S.allocFloat(
+      S.getASTContext().getFloatTypeSemantics(S.getASTContext().FloatTy));
+  APFloat SrcD = B.elem<Floating>(0).getAPFloat();
+  if (!convertDoubleToFloatStrict(SrcD, Conv, S, Call))
+    return false;
+  Dst.elem<Floating>(0) = Conv;
+
+  Dst.initializeAllElements();
+  return true;
+}
+
+static bool interp__builtin_ia32_cvtsd2ss_round_mask(InterpState &S,
+                                                     CodePtr OpPC,
+                                                     const CallExpr *Call) {
+  assert(Call->getNumArgs() == 5);
+
+  // Pop in reverse order: rounding, mask, src, b, a
+  APSInt Rounding = popToAPSInt(S, Call->getArg(4)->getType());
+  APSInt MaskInt = popToAPSInt(S, Call->getArg(3)->getType());
+  const Pointer &Src = S.Stk.pop<Pointer>();
+  const Pointer &B = S.Stk.pop<Pointer>();
+  const Pointer &A = S.Stk.pop<Pointer>();
+  if (!CheckLoad(S, OpPC, A) || !CheckLoad(S, OpPC, B) ||
+      !CheckLoad(S, OpPC, Src))
+    return false;
+
+  const auto *DstVTy = Call->getType()->castAs<VectorType>();
+  unsigned NumElems = DstVTy->getNumElements();
+  const Pointer &Dst = S.Stk.peek<Pointer>();
+
+  // Copy all elements from A to Dst
----------------
tbaederr wrote:

```suggestion
  // Copy all elements from A to Dst.
```

https://github.com/llvm/llvm-project/pull/169980
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