Re: Enable scheduler of GCC

[Le Ton Chanh <letonchanh at yahoo dot com>]

Thank you for your help. Now my GCC ran with '-dS' and '-dR' option. It's helpful for debug my automata.

Le Ton Chanh 
email:letonchanh at yahoo dot com


--- On Tue, 9/23/08, Ian Lance Taylor <iant@google.com> wrote:

> From: Ian Lance Taylor <iant@google.com>
> Subject: Re: Enable scheduler of GCC
> To: "Le Ton Chanh" <letonchanh@yahoo.com>
> Cc: "GCC Help" <gcc-help@gcc.gnu.org>
> Date: Tuesday, September 23, 2008, 9:21 PM
> Le Ton Chanh <letonchanh@yahoo.com> writes:
> 
> > I am a beginner in porting GCC. I have defined an
> automata for sheduling of my port. But it seems not to run. 
> > When configuring, I used the option
> '--with-schedule' and '--enable-haifa'. 
> > When using gcc-cross, I used the option
> '-fschedule-insns', '-fschedule-insns2' and
> I tried to dump debug infomation of scheduling by
> '-dS' and -'dR' but it generated nothing. I
> am using GCC 3.3.4 for my port.
> > Please help me to enable the scheduler and generate
> scheduling debug information.
> 
> In order to enable the scheduler you need to write
> appropriate clauses
> in your MD file.  See the internal documentation.  In
> current gcc you
> need to write define_automaton, define_cpu_unit, and
> define_insn_reservation clauses.  I think gcc 3.3 still
> used the old
> scheduler which worked differently.
> 
> Assuming you have written those, then you need to optimize
> (with -O)
> in order for the scheduler to run.
> 
> Ian