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Re: Simplify jump threading slightly

From: Jeff Law <law at redhat dot com>
To: Gerald Pfeifer <gerald at pfeifer dot com>
Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 06 Sep 2013 14:13:37 -0600
Subject: Re: Simplify jump threading slightly
Authentication-results: sourceware.org; auth=none
References: <5228E9CC dot 8030207 at redhat dot com> <alpine dot LNX dot 2 dot 00 dot 1309062206530 dot 11903 at tuna dot site>

On 09/06/2013 02:10 PM, Gerald Pfeifer wrote:

Hi Jeff,

On Thu, 5 Sep 2013, Jeff Law wrote:

Bootstrapped and regression tested on x86_64-unknown-linux-gnu.
Installed onto the trunk.


is it possible this

   2013-09-05  Jeff Law  <law@redhat.com>

        * tree-ssa-threadedge.c (thread_around_empty_blocks): Renamed
        from thread_around_empty_block.  Record threading path into PATH.
        Recurse if threading through the initial block is successful.
        (thread_across_edge): Corresponding changes to slightly simplify.

is causing http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58340 , or
least unearthing it?

That's amd64-unknown-freebsd8.0, pretty similar to your test platform,
so this would be a bit surprising, but...

I'll take a look. I'm not a big believer in coincidences -- with thatcode recently changing and you seeing a bootstrap failure, odds are,it's something in that change.

The day is winding down, so it'll probably be monday before I get toofar on it.


jeff

References:
- Simplify jump threading slightly
  - From: Jeff Law
- Re: Simplify jump threading slightly
  - From: Gerald Pfeifer

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