[LLVMdev] byval attr for base+range parameters

[Reid Kleckner]

That is not what byval does.  byval implicitly copies the pointee into the
argument slots used for the call or registers on some architectures.


On Thu, Jan 23, 2014 at 7:42 PM, Yuanfang Chen <cyfmxc at gmail.com> wrote:

> Hello guys,
>
> For single scalar pointer parameter, we have 'byval' to specify the
> pointee is not changed. But for base+range parameters like:
> declare void @_gfortran_transfer_integer_write(%struct.__st_parameter_dt*,
> i8*, i32)
> (This is the fortran runtime api to 'printf' one integer) The 2nd &
> 3rd args are used to specify the memory of that integer. I didn't find
> a comfortable way to specify that it's 'byval'.  I need this to make
> argpromotion work. Right now I just create an alloca, load value into
> it, and specify this alloca(base+range) as parameter.   Is it a
> missing feature or there is a solution already?
>
>
> thanks,
> yuanfang
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