[ Redirecting to gcc-help. Please make sure you are sending text-only messages. html formatted messages will be rejected by the list. ] On Mon, Oct 19, 2009 at 11:00, Adarsh malu <adarsh_there@xxxxxxxxxxx> wrote: > > Hello, > We are working on project with the target of Implement a pass to do available expression analysis & Using above information, implement a pass to add Common subexpression elimination optimization. > However we are unable to find documentation on the same and its being difficult for us to get througs the pass of cse.c , gcse.c as they being huge loc . Could you please elaborate us how to proceed and carry the project ahead. > Any of your suggestion would really help us. For available expressions, you may want to look at the code in tree-ssa-pre.c and tree-ssa-sccvn.c. They work on GIMPLE (a higher level IL than RTL) which may be closer to what you are looking for. The first file implements PRE and the second are routines used to compute value numbers on gimple expressions. You can see the effects of PRE with -fdump-tree-pre. General documentation on GCC internals is available via http://gcc.gnu.org/wiki/GettingStarted/ Diego.
