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Hallo! I use a custom calling convention in which the first 4 arguments are promoted to registers and the rest to the stack, and the callee is responsible for popping the stack arguments. So when calling a function with 5 arguments i get this code: movq ARG_5, (%rsp) callq fun_foo_1 .Ltmp4: subq $8, %rsp I use a garbage collector with postcall safe points (.Ltmp4 is such) which needs to know the frame size, for each safe point. The problem is that at .Ltmp4 the frame size is actually different from what getFrameSize() would return....