middle-end/7315: DEC floating point support in real.c is broken

middle-end/7315: DEC floating point support in real.c is broken

[dave]

>Number:         7315
>Category:       middle-end
>Synopsis:       DEC floating point support in real.c is broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 15 12:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Dave Anglin
>Release:        3.1 branch and 3.2
>Organization:
>Environment:
vax-dec-ultrix4.3
>Description:
DEC floating point constants are incorrectly generated by
the current emulator in real.c.  For example, the complex
value output for [(float)1, (float)0] in 20020227-1.c
is

        .align 2
LC0:
        .long   1065353216
        .long   0

The correct value for the first long is 16512.  It appears
that the IEEE value is being used instead of the DEC value.
>How-To-Repeat:
The problem can be duplicated with a cross compiler
to vax-dec-ultrix4.3.
>Fix:
A proposed fix for the problem on the main is here:
<http://gcc.gnu.org/ml/gcc-patches/2002-06/msg00645.html>.

The best solution for the 3.1 branch may be to revert to not
defining REAL_ARITHMETIC.
>Release-Note:
>Audit-Trail:
>Unformatted:

Re: middle-end/7315: DEC floating point support in real.c is broken

[Richard Henderson]

The following reply was made to PR middle-end/7315; it has been noted by GNATS.

From: Richard Henderson <rth@redhat.com>
To: Steven Bosscher <s.bosscher@student.tudelft.nl>
Cc: dave@hiauly1.hia.nrc.ca, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
   gcc-bugs@gcc.gnu.org, mark@codesourcery.com
Subject: Re: middle-end/7315: DEC floating point support in real.c is broken
Date: Wed, 18 Sep 2002 18:31:36 -0700

 On Thu, Sep 19, 2002 at 12:38:50AM +0200, Steven Bosscher wrote:
 > Does this still happen with the new real.c implementation?
 
 No.
 
 
 r~

Re: middle-end/7315: DEC floating point support in real.c is broken

[John David Anglin]

The following reply was made to PR middle-end/7315; it has been noted by GNATS.

From: "John David Anglin" <dave@hiauly1.hia.nrc.ca>
To: s.bosscher@student.tudelft.nl (Steven Bosscher)
Cc: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org,
   mark@codesourcery.com
Subject: Re: middle-end/7315: DEC floating point support in real.c is broken
Date: Wed, 18 Sep 2002 19:10:34 -0400 (EDT)

 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7315
 > 
 > Does this still happen with the new real.c implementation?
 
 As far as I know, 3.3 is OK.  However, the current release branch (3.2)
 is still broken and I doubt it can be fixed without an unacceptable
 amount of changes to real.c.  The 3.2 branch can be built with the
 native compiler.  3.3 currently can't.
 
 At some point, I plan to change vax.h back to not using the emulator
 on the 3.2 branch.  This was the way it was before 3.1/3.2.  This will
 fix the problem for native compilers but it won't be possible to build
 a working cross compiler.
 
 Dave
 -- 
 J. David Anglin                                  dave.anglin@nrc.ca
 National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: middle-end/7315: DEC floating point support in real.c is broken

[Steven Bosscher]

The following reply was made to PR middle-end/7315; it has been noted by GNATS.

From: Steven Bosscher <s.bosscher@student.tudelft.nl>
To: dave@hiauly1.hia.nrc.ca, gcc-gnats@gcc.gnu.org,
	gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org, mark@codesourcery.com
Cc:  
Subject: Re: middle-end/7315: DEC floating point support in real.c is broken
Date: Thu, 19 Sep 2002 00:38:50 +0200

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7315
 
 Does this still happen with the new real.c implementation?