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[PATCH GCC8][26/33]Record newly used inv_vars during cost computation

From: Bin Cheng <Bin dot Cheng at arm dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: nd <nd at arm dot com>
Date: Tue, 18 Apr 2017 10:51:49 +0000
Subject: [PATCH GCC8][26/33]Record newly used inv_vars during cost computation
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Hi,
At the moment, inv_vars are recognized during finding iv_uses.  It's also
possible that inv_vars are used when expressing iv_use with specific cand.
Unfortunately, such inv_vars are neither recognized nor considered in reg
pressure estimation.  This patch modifies find_inv_vars_cb so that such
invariant variables are also recognized and recorded.  The patch also moves
dump information later so that all invariant variables can be dumped.
Is it OK?

Thanks
bin
2017-04-11  Bin Cheng  <bin.cheng@arm.com>

	* tree-ssa-loop-ivopts.c (find_interesting_uses): Move inv vars dump
	to ...
	(determine_group_iv_costs): ... here.
	(find_inv_vars_cb): Record inv var if it's not recorded before.

Attachment: 0026-record-newly-used-inv_var-20170224.txt
Description: 0026-record-newly-used-inv_var-20170224.txt

Follow-Ups:
- Re: [PATCH GCC8][26/33]Record newly used inv_vars during cost computation
  - From: Richard Biener

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