[llvm-branch-commits] [clang] [ConstantTime][Clang] Add __builtin_ct_select for constant-time selection (PR #166703)

[Matt Arsenault via llvm-branch-commits]

================
@@ -3845,6 +3845,70 @@ 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
----------------
arsenm wrote:

Missing error test

https://github.com/llvm/llvm-project/pull/166703
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