================
@@ -269,6 +270,22 @@ RValue CIRGenFunction::emitBuiltinExpr(const GlobalDecl 
&gd, unsigned builtinID,
   case Builtin::BI__builtin_rotateright32:
   case Builtin::BI__builtin_rotateright64:
     return emitRotate(e, /*isRotateLeft=*/false);
+
+  case Builtin::BI__builtin_trap: {
+    builder.create<cir::TrapOp>(loc);
+    // Note that cir.trap is a terminator so we need to start a new dummy block
+    // to preserve the builder's insertion point.
+    builder.createBlock(builder.getBlock()->getParent());
----------------
xlauko wrote:

Exercise this in tests, so that additional block is really required. Same for 
unreachable below.

https://github.com/llvm/llvm-project/pull/151363
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