If call result is in ST0 and it is not being passed to the caller's caller, then it is not safe to optimize the call into a sibcall since the call result has to be popped off the x87 stack.
If call result is in ST0 and it is not being passed to the caller's
caller, then it is not safe to optimize the call into a sibcall since
the call result has to be popped off the x87 stack.


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