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Re: new regression on 4.3.0 branch

From: DJ Delorie <dj at redhat dot com>
To: richard dot guenther at gmail dot com
Cc: gcc at gcc dot gnu dot org
Date: Mon, 3 Mar 2008 17:29:31 -0500
Subject: Re: new regression on 4.3.0 branch
References: <200803011548.m21FmcVM005038@greed.delorie.com> <84fc9c000803010754g59d93351sa9e4cd8de99345c5@mail.gmail.com>

> >  PASS-FAIL: gcc.c-torture/execute/980707-1.c execution,  -O3 -fomit-frame-pointer
>
> Can you pin-point the patch that caused this and investigate what is
> going wrong?

Looks like a schroedinbug.  The .s file from before ("pass") is
obviously wrong, but the right value *happens* to be in the right
register at the right time to cause the test to pass.

The non-related patch perturbed the compiler just enough to alter the
way the program was optimized (strange but true), which changed the
"just happens" into a "doesn't".

References:
- new regression on 4.3.0 branch
  - From: DJ Delorie
- Re: new regression on 4.3.0 branch
  - From: Richard Guenther

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