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Re: [PATCH] Improve DOM's optimization of control statements

From: Jeff Law <law at redhat dot com>
To: Renlin Li <renlin dot li at arm dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>
Date: Fri, 2 Oct 2015 09:15:41 -0600
Subject: Re: [PATCH] Improve DOM's optimization of control statements
Authentication-results: sourceware.org; auth=none
References: <560C45EE dot 10202 at redhat dot com> <560E6759 dot 3020806 at arm dot com>

On 10/02/2015 05:15 AM, Renlin Li wrote:

Hi Jeff,

Your patch causes an ICE regression.
The test case is " gcc.c-torture/compile/pr27087.c", I observed it on
aarch64-none-elf target when compiling the test case with '-Os' flag.

A quick check shows, the cfg has been changed, but the loop information
is not updated. Thus the information about the number of basic block in
a loop is not reliable.

Could you please have a look?

Yup.  Will do.   Thanks for letting me know.

jeff

References:
- Re: [PATCH] Improve DOM's optimization of control statements
  - From: Renlin Li

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