From: Andrew Cagney <ac131313@cygnus.com>
To: Ben Elliston <bje@redhat.com>
Cc: CGEN <cgen@sources.redhat.com>, gdb@sources.redhat.com
Subject: Re: Tracing for floating point values
Date: Thu, 14 Dec 2000 17:04:00 -0000 [thread overview]
Message-ID: <3A396BB0.7CF48446@cygnus.com> (raw)
In-Reply-To: <Pine.LNX.4.31.0012090940090.22164-100000@moshpit.cygnus.com>
Ben Elliston wrote:
>
> Currently, the TRACE_RESULTS web of macros/functions in
> sim/common/cgen-trace.c don't know how to handle the 'f' printf-type for SF
> and DF operands. Only 'D' and 'x' are handled at present.
>
> I set about fixing this yesterday. There were two approaches I considered:
>
> * use the host's native printf %x. Comments in sim-fpu.[hc]
> indicate this is a bad mistake. There's no guarantee that the
> host will use the same floating point representation as the
> target.
You would need to be very careful about SNaNs.
> * use sim_fpu's sim_fpu_print_fpu to output the real number
> using cgen_trace_printf as its callback (which works nicely).
> However, we get very detailed output!
>
> fr <- +1.0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000*2^+0
>
> Which way seems right to jump?
What about a print function that outputs things in decimal - something
like ``%f'' or ``%g''. While the existing print function is really
useful for someone debugging the internals it isn't much use to normal
users.
Andrew
prev parent reply other threads:[~2000-12-14 17:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-08 14:57 Ben Elliston
2000-12-14 17:04 ` Andrew Cagney [this message]
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