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[PATCH 7/7] SMS remove dependence on doloop: To identify read/write register as loop induction variable

From: Shiva Chen <shivac at marvell dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>, "bschmidt at redhat dot com" <bschmidt at redhat dot com>, Shiva Chen <shiva0217 at gmail dot com>
Date: Thu, 5 May 2016 06:03:13 +0000
Subject: [PATCH 7/7] SMS remove dependence on doloop: To identify read/write register as loop induction variable
Authentication-results: sourceware.org; auth=none

Hi,

We use loop induction variable analysis to find count_reg.
Without doloop optimization, count_reg might be a READ_WRITE_REG.

E.g.  while (reg < 0x200) { MEM [++reg:SI] = 5}

READ_WRITE_REG won't identify as loop induction variable
and SMS will skip the loop. We modify loop-iv.c to identify this case.

Thanks,
Shiva

Attachment: 0007-To-identify-READ_WRITE_REG-as-loop-induction-variabl.patch
Description: 0007-To-identify-READ_WRITE_REG-as-loop-induction-variabl.patch

Follow-Ups:
- Re: [PATCH 7/7] SMS remove dependence on doloop: To identify read/write register as loop induction variable
  - From: Bernd Schmidt

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