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Re: IRA combine_and_move_insns fix, PR78669

From: Vladimir N Makarov <vmakarov at redhat dot com>
To: Bernd Schmidt <bschmidt at redhat dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Wed, 7 Dec 2016 09:47:59 -0500
Subject: Re: IRA combine_and_move_insns fix, PR78669
Authentication-results: sourceware.org; auth=none
References: <757fbe34-09f4-9020-4a2e-4178d44ef109@redhat.com>



On 12/06/2016 01:10 PM, Bernd Schmidt wrote:

In this PR, we have two registers with "replace" set for them. Whenprocessing the first, we delete its setter, which happens to be theonly use of the other register. In the second iteration we then assertthat the other register has a use, which would be reasonable if wehadn't deleted it.
The following fixes it. Bootstrapped and tested on x86_64-linux, ok?

Sure, Bernd.

Please, use effective target Uros proposed in the test (btw I recentlydid the same mistake with one my test too).

References:
- IRA combine_and_move_insns fix, PR78669
  - From: Bernd Schmidt

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