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

[Vladimir Makarov]

On 2015-03-23 12:35 PM, Ajit Kumar Agarwal wrote:
> 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.
>
>
  Sorry, I am not a maintainer/reviewer of loop invariant motion pass. 
I had no power to approve this, especially when you change mostly code
for ! flag_ira_loop_pressure.

  I only should say that microblaze is not a primary target.  You should
demonstrate improvement on a primary target, x86/x86-64 the best. 
SPEC2000 or SPEC2006 would be a good benchmark for this.