[clang] [Clang] Add builtins for masked vector loads / stores (PR #154464)

[Erich Keane via cfe-commits]

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@@ -2266,6 +2266,89 @@ static bool BuiltinCountZeroBitsGeneric(Sema &S, CallExpr *TheCall) {
   return false;
 }
 
+static bool CheckMaskedBuiltinArgs(Sema &S, Expr *MaskArg, Expr *PtrArg,
+                                         unsigned Pos) {
+  QualType MaskTy = MaskArg->getType();
+  if (!MaskTy->isExtVectorBoolType()) {
+        S.Diag(MaskArg->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+        << 1 << /* vector of */ 4 << /* booleans */ 6 << /* no fp */ 0
+        << MaskTy;
+        return true;
+  }
+
+  QualType PtrTy = PtrArg->getType();
+  if (!PtrTy->isPointerType() || !PtrTy->getPointeeType()->isVectorType()) {
+        S.Diag(PtrArg->getExprLoc(), diag::err_vec_masked_load_store_ptr)
+        << Pos << "pointer to vector";
+        return true;
+}
+return false;
+}
+
+static ExprResult BuiltinMaskedLoad(Sema &S, CallExpr *TheCall) {
+  if (S.checkArgCount(TheCall, 2))
+    return ExprError();
+
+  Expr *MaskArg = TheCall->getArg(0);
+  Expr *PtrArg = TheCall->getArg(1);
+  if (CheckMaskedBuiltinArgs(S, MaskArg, PtrArg, 2))
+    return ExprError();
+
+  QualType MaskTy = MaskArg->getType();
+  QualType PtrTy = PtrArg->getType();
+  QualType PointeeTy = PtrTy->getPointeeType();
+  const VectorType *MaskVecTy = MaskTy->getAs<VectorType>();
+  const VectorType *DataVecTy = PointeeTy->getAs<VectorType>();
+  if (MaskVecTy->getNumElements() != DataVecTy->getNumElements())
+    return ExprError(
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erichkeane wrote:

Huh, TIL...

https://github.com/llvm/llvm-project/pull/154464