From mboxrd@z Thu Jan  1 00:00:00 1970
From: philippe_ribet@hotmail.com
To: gcc-gnats@gcc.gnu.org
Subject: optimization/4570: error reading bytes from double variable
Date: Mon, 15 Oct 2001 02:06:00 -0000
Message-id: <20011015085925.15985.qmail@sourceware.cygnus.com>
X-SW-Source: 2001-10/msg00306.html
List-Id: <gcc-prs.sourceware.org>

>Number:         4570
>Category:       optimization
>Synopsis:       error reading bytes from double variable
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 15 02:06:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     philippe_ribet@hotmail.com
>Release:        gcc version 3.0.2 20010922
>Organization:
>Environment:
Athlon processor
>Description:
gcc-3.0.1 give good result up to -O2, bad one with -O3
gcc-3.0.2 give good result without optimization, bad with -O2
May be relative to optimization recently moved from -O3 to -O2.

main()
{
  double e=0;
  e=(double)(0.5);
  printf("e=%08x%08x\n",*((int *)(((char *)(&e)))),*((int *)(((char *)(&e))+4)));
}

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: