Re: optimization/8300: ICE in gen_reg_rtx, at emit-rtl.c:662

Re: optimization/8300: ICE in gen_reg_rtx, at emit-rtl.c:662

[Christian Ehrhardt]

The following reply was made to PR optimization/8300; it has been noted by GNATS.

From: "Christian Ehrhardt" <ehrhardt@mathematik.uni-ulm.de>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, rschiele@uni-mannheim.de,
  gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
  tneumann@pi3.informatik.uni-mannheim.de
Cc:  
Subject: Re: optimization/8300: ICE in gen_reg_rtx, at emit-rtl.c:662
Date: Tue, 3 Dec 2002 18:51:23 +0100

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8300
 
 I can confirm this on 3.2, 3.2.1-prerelease and 3.3.
 
      regards   Christian Ehrhardt
 

Re: optimization/8300: ICE in gen_reg_rtx, at emit-rtl.c:662

[Robert Schiele]

The following reply was made to PR optimization/8300; it has been noted by GNATS.

From: Robert Schiele <rschiele@uni-mannheim.de>
To: gcc-gnats@gcc.gnu.org
Cc: tneumann@pi3.informatik.uni-mannheim.de
Subject: Re: optimization/8300: ICE in gen_reg_rtx, at emit-rtl.c:662
Date: Sat, 26 Oct 2002 11:40:12 +0200

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 On Mon, Oct 21, 2002 at 01:04:31PM -0000, Robert Schiele wrote:
 >=20
 > >Number:         8300
 > >Category:       optimization
 > >Synopsis:       ICE in gen_reg_rtx, at emit-rtl.c:662
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    unassigned
 > >State:          open
 > >Class:          ice-on-legal-code
 		   ^^^^^^^^^^^^^^^^^
 I submitted this with class ice-on-legal-code.  Now someone changed
 this silently to ice-on-illegal-code in the database.
 
 > void a() {
 >     double b;
 >     int c =3D *((int*)&b) && (*(&c + 1) =3D 0);
 > }
 
 If you are the one that changed this, could you please explain, why
 you consider this illegal!  Yes, it is braindead and stupid, but I
 can't find a reason why this should be illegal.  But hey, it is just a
 sample to show a bug in gcc, it does not need to make sense, does it?
 
 Anyway, why are such things silently changed without notification of
 the interrested parties?  I think this is somewhat annoying.
 
 Robert
 
 --=20
 Robert Schiele			Tel.: +49-621-181-2517
 Dipl.-Wirtsch.informatiker	mailto:rschiele@uni-mannheim.de
 
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optimization/8300: ICE in gen_reg_rtx, at emit-rtl.c:662

[rschiele]

>Number:         8300
>Category:       optimization
>Synopsis:       ICE in gen_reg_rtx, at emit-rtl.c:662
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 21 06:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Robert Schiele
>Release:        3.2.1 20021020 (prerelease)
>Organization:
>Environment:
System: SunOS manray 5.8 Generic_108528-14 sun4u sparc SUNW,Ultra-4
Architecture: sun4
host: sparc-sun-solaris2.8
build: sparc-sun-solaris2.8
target: sparc-sun-solaris2.8
configured with: /home/schiele/gcccvs/gcc.gcc-3_2-branch/configure --enable-threads=posix --prefix=/opt/Pkg/SunOS/gcc321 --enable-languages=c,c++,f77,objc --disable-libgcj --with-gxx-include-dir=/opt/Pkg/SunOS/gcc321/include/g++ --with-system-zlib --enable-shared sparc-sun-solaris2.8
>Description:
The attached code results in an ICE on both, sparc-sun-solaris2.8 and sparc64-sun-solaris2.8 when compiled with optimizations turned on.  This does _not_ happen in sparc-*-linux.

Note: This is a regression to 2.95.3!
>How-To-Repeat:
gcc -O ice.i
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="ice.i"
Content-Disposition: inline; filename="ice.i"

void a() {
    double b;
    int c = *((int*)&b) && (*(&c + 1) = 0);
}