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Date: Mon, 16 Dec 2013 21:10:00 -0000
Message-ID: <CAEEAEzV9pkYX_fkH2R=gRSJvF6P2CdGmJuMktC31rvgu_jPuYg@mail.gmail.com>
Subject: GIMPLE pass - Assignment evaluation
From: Sandeep K Chaudhary <babbusandy2006@gmail.com>
To: "gcc-help@gcc.gnu.org" <gcc-help@gcc.gnu.org>, gcc@gcc.gnu.org
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X-SW-Source: 2013-12/txt/msg00109.txt.bz2

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?

I tried -O1 and higher optimization levels but I don't see any
difference. This is how I am building and loading my plugin...

g++ -I`g++ -print-file-name=plugin`/include -fPIC -shared -O1
gimple_pass.c -o plugin.so
g++ -fplugin=/home/sandeep/myplugin/gimple/plugin.so -O1 -c test.c

Also, I thought of going with RTL passes but RTL IR seems too complex
for my use and also it's not suitable for high level optimizations.
Please suggest.

Thanks and regards,
Sandeep.