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Re: side effects of the compiler-generated calls


David Livshin wrote:
gfortran generated code uses calls to routines with the names that begin with “_gfortran_”, e.g. “_gfortran_set_std”, “_gfortran_st_write” etc. What are the side effects of these routines? What registers are used/affected by them? And most importantly, do they affect the value of the stack pointer ( %esp )?

They are normal function calls in the C sense, so arguments are pushed on the stack by the caller, and the caller pops them off the stack after the callee has returned, so it's a bit of a matter of definition to say if the call affects %esp or not, but the _callee_ will return it unchanged.


But maybe that's not your question, could you give more detail on what you're trying to achieve?

Cheers,
- Tobi


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