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Patch to handle perfect loop unrolling in tree_transform_and_unroll_loop

From: "Bingfeng Mei" <bmei at broadcom dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: "Zdenek Dvorak" <rakdver at kam dot mff dot cuni dot cz>, "jean dot christophe dot beyler at gmail dot com" <jean dot christophe dot beyler at gmail dot com>
Date: Wed, 28 Oct 2009 07:43:43 -0700
Subject: Patch to handle perfect loop unrolling in tree_transform_and_unroll_loop

Hello, 
This patch is to handle perfect loop unrolling as
discussed in http://gcc.gnu.org/ml/gcc/2009-10/msg00333.html. 

I merged the original code into tree_transform_and_unroll_loop,
and added some code to get probability/frequency right.

This is related to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36712
A tree-level unrolling pass will just call this modified function. 
I will submit a separate patch if needed. 

2009-10-28  Bingfeng Mei <bmei@broadcom.com>

	* tree_transform_and_unroll_loop (tree_transform_and_unroll_loop):
	To handle perfect loop unrolling. (perfect_loop_unrolling_p): New function
	to check whether a loop can perfect unrolling.

Cheers,
Bingfeng Mei

Attachment: patch_loop_unrolling;size=17305;creation-date="Wed,
Description: patch_loop_unrolling

Follow-Ups:
- Re: Patch to handle perfect loop unrolling in tree_transform_and_unroll_loop
  - From: Jean Christophe Beyler

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