From: Marc Glisse <marc.glisse@inria.fr>
To: Sandeep K Chaudhary <babbusandy2006@gmail.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: GIMPLE pass - Assignment evaluation
Date: Tue, 02 Jul 2013 05:44:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.10.1307020740130.3919@laptop-mg.saclay.inria.fr> (raw)
In-Reply-To: <CAEEAEzWhzF=4hQ-CNybsHSENWvGTEDXtmCGaMy1YC8DN9GXuOA@mail.gmail.com>
On Mon, 1 Jul 2013, Sandeep K Chaudhary wrote:
> Hi guys,
>
> I am writing a GIMPLE pass in which I need to inspect the assignments.
> For example, for the below statements, I need to find the value of the
> second and third assignments which are '2' and '7'.
>
> VAR1 = 1;
> VAR1++;
> VAR1 = VAR1 + 5;
>
> But the GIMPLE IR only has the following statements i.e. no optimization.
>
> VAR1_2 = 1;
> VAR1_3 = VAR1_2 + 1;
> VAR1_4 = VAR1_3 + 5;
>
> How can I make it perform calculations on RHS? Are there some flags
> that I can enable?
-O1 (or higher) enables the CCP pass which propagates the constants. Note
that only the last value will be left after that. If you need the
intermediate ones for some reason, maybe you could look into the CCP pass
and modify it for your needs?
--
Marc Glisse
next prev parent reply other threads:[~2013-07-02 5:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-02 3:24 Sandeep K Chaudhary
2013-07-02 5:44 ` Marc Glisse [this message]
2013-07-02 17:09 ` Sandeep K Chaudhary
2013-07-10 8:18 ` Sandeep K Chaudhary
2013-12-09 23:05 Sandeep K Chaudhary
2013-12-16 21:10 Sandeep K Chaudhary
2013-12-17 1:33 ` David Malcolm
2013-12-17 6:24 ` Sandeep K Chaudhary
2013-12-17 6:41 ` Uday P. Khedker
2013-12-17 7:26 ` Sandeep K Chaudhary
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