================
@@ -3494,6 +3494,95 @@ Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl,
unsigned BuiltinID,
if (BuiltinCountedByRef(TheCall))
return ExprError();
break;
+
+ case Builtin::BI__builtin_ct_select: {
+ if (TheCall->getNumArgs() != 3) {
+ // Simple argument count check without complex diagnostics
+ if (TheCall->getNumArgs() < 3) {
+ return Diag(TheCall->getEndLoc(),
+ diag::err_typecheck_call_too_few_args_at_least)
+ << 0 << 3 << TheCall->getNumArgs() << 0
+ << TheCall->getCallee()->getSourceRange();
+ } else {
+ return Diag(TheCall->getEndLoc(),
+ diag::err_typecheck_call_too_many_args)
+ << 0 << 3 << TheCall->getNumArgs() << 0
+ << TheCall->getCallee()->getSourceRange();
+ }
+ }
+ auto *Cond = TheCall->getArg(0);
+ auto *A = TheCall->getArg(1);
+ auto *B = TheCall->getArg(2);
+
+ QualType CondTy = Cond->getType();
+ if (!CondTy->isIntegerType()) {
+ return Diag(Cond->getBeginLoc(), diag::err_typecheck_cond_expect_scalar)
+ << CondTy << Cond->getSourceRange();
+ }
+
+ QualType ATy = A->getType();
+ QualType BTy = B->getType();
+
+ // check for scalar or vector scalar type
+ if ((!ATy->isScalarType() && !ATy->isVectorType()) ||
+ (!BTy->isScalarType() && !BTy->isVectorType())) {
----------------
efriedma-quic wrote:
You probably want to do array/function promotion before this check?
https://github.com/llvm/llvm-project/pull/166703
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