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systemc-forum - Re: [systemc-forum] Single step assignment of .range() width > 64 bits t Message Thread: Previous | Next
  • To: alan.fitch@xxxxxxxxxx
  • From: Bernard Deadman <bdeadman@xxxxxxxxxx>
  • Date: Mon, 20 Feb 2012 09:00:52 -0600
  • Cc: "systemc-forum@xxxxxxxxxxxxxxxxxxx" <systemc-forum@xxxxxxxxxxxxxxxxxxx>
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Hi Alan,

It's actually sc_bv - I missed that when sanitizing the example!

Thanks - that seems to work. I'd tried casting to the type of the LHS but that doesn't work as it's still ambiguous, but it hadn't occurred to me to try casting to a signal of the correct width!

Thanks again,


On 2/20/2012 8:50 AM, alan.fitch@xxxxxxxxxx wrote:
Hi Bernard,
  I guess your signal declaration should be

sc_signal<sc_lv<256> > my_signal;// sc_lv??

In that case you could use

 my_variable = sc_lv<128>(,64));

The trick is to cast the result of the slice to sc_lv or sc_bv - then the overloaded = is unambiguous and can do its work.


Alan Fitch
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From:   Bernard Deadman <bdeadman@xxxxxxxxxx>
To: "systemc-forum@xxxxxxxxxxxxxxxxxxx" <systemc-forum@xxxxxxxxxxxxxxxxxxx>
Date:   20/02/2012 14:42
Subject: [systemc-forum] Single step assignment of .range() width > 64 bits to sc_biguint<W> ?
Sent by:        <systemc-forum@xxxxxxxxxxxxxxxxxxx>


Does anyone have any ideas how to make this assignment in a single line?

sc_signal<256> my_signal;

sc_biguint<128> my_variable;

my_variable =,64):

If I try to compile that using Visual Studio (I have SystemC 2.2) I get:

1>.........cpp(57) : error C2593: 'operator =' is ambiguous
could be 'sc_dt::sc_biguint<W> &sc_dt::sc_biguint<W>::operator =(const
sc_dt::sc_lv_base &)'
1>        with
1>        [
1>            W=128
1>        ]
or 'sc_dt::sc_biguint<W> &sc_dt::sc_biguint<W>::operator =(const
sc_dt::sc_bv_base &)'
1>        with
1>        [
1>            W=128
1>        ]
1>        while trying to match the argument list
'(sc_dt::sc_biguint<W>, sc_dt::sc_subref_r<X>)'
1>        with
1>        [
1>            W=128
1>        ]
1>        and
1>        [
1>            X=sc_dt::sc_bv_base
1>        ]

I also looked at the .to_xyz() conversion methods but there's nothing
that supports values > 64 bits.   I guess I could make several slices
however that will be awkward if the range values are variables.

Has anyone any ideas for simple ways to do this?



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