[Patch] OPT: Update heuristics for loop-invariant for address arithmetic.

[Ajit Kumar Agarwal]

Hello All:

Did you get a chance to look at the below patch.

Thanks & Regards
Ajit

-----Original Message-----
From: gcc-patches-owner@gcc.gnu.org [mailto:gcc-patches-owner@gcc.gnu.org] On Behalf Of Ajit Kumar Agarwal
Sent: Wednesday, March 04, 2015 3:57 PM
To: vmakarov@redhat.com; GCC Patches
Cc: Vinod Kathail; Shail Aditya Gupta; Vidhumouli Hunsigida; Nagaraju Mekala
Subject: [Patch] OPT: Update heuristics for loop-invariant for address arithmetic.

Hello All:

The changes are made in the patch to update the heuristics for loop invariant for address arithemetic at RTL Level. 
The heuristics are updated with the consideration of single def and use for register pressure calculation instead Of ignoring it and also to update the estimated register pressure cost along with the check of actual uses with Address uses.

With the above change, gains are seen in the Geomean for Mibench/EEMBC benchmarks for microblaze target. No Regression is seen in deja GNU regressions tests for microblaze.

Please let us know your feedback.

commit 039b95028c93f99fc1da7fa255f9b5fff4e17223
Author: Ajit Kumar Agarwal <ajitkum@xhdspdgnu.(none)>
Date:   Wed Mar 4 15:46:45 2015 +0530

    [Patch] OPT: Update heuristics for loop-invariant for address arithmetic.
    
    The changes are made in the patch to update the heuristics
    for loop invariant for address arithmetic. The heuristics is
    changed to incorporate the single def and use in the register
    pressure calculation in order to move the invariant out of
    loop. The heuristics are further changed to not to use the
    check for addr uses with actual uses. Also changes are done in
    the heuristics of estimated register pressure cost.
    
    ChangeLog:
    2015-03-04  Ajit Agarwal  <ajitkum@xilinx.com>
    
            * loop-invariant.c (gain_for_invariant): update the
            heuristics for estimate_reg_pressure_cost.
            (get_inv_cost): Remove the check for addr uses with
            actual uses. Add the single def and use in the register
            pressure for invariants.
    
    Signed-off-by:Ajit Agarwal ajitkum@xilinx.com

Thanks & Regards
Ajit