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[PATCH GCC8][21/33]Support compare iv_use which both sides of comparison are IVs

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 10:49:09 +0000
Subject: [PATCH GCC8][21/33]Support compare iv_use which both sides of comparison are IVs
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Hi,
This patch supports compare iv_use for comparison whose both sides are IVs.
With this patch, optimal code is generated for PR53090.
Is it OK?

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

        PR tree-optimization/53090
        * tree-ssa-loop-ivopts.c (enum comp_iv_rewrite): New enum value
        COMP_IV_EXPR_2.
        (extract_cond_operands): Detect condition with IV on both sides
        and return COMP_IV_EXPR_2.
        (find_interesting_uses_cond): Add iv_use for both IVs in condition.
        (rewrite_use_compare): Simplify by removing call to function
        extract_cond_operands.

Attachment: 0021-iv-comparing-against-another-iv-20170313.txt
Description: 0021-iv-comparing-against-another-iv-20170313.txt

Follow-Ups:
- Re: [PATCH GCC8][21/33]Support compare iv_use which both sides of comparison are IVs
  - From: Richard Biener

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