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Date: Mon, 13 Jul 2009 07:32:00 -0000
Message-ID: <84fc9c000907130032k93fd677o21f6e0ffa5ea62fc@mail.gmail.com>
Subject: Re: FAIL: gcc.c-torture/compile/20000804-1.c -O0 with PIC on  	gcc-4_4-branch
From: Richard Guenther <richard.guenther@gmail.com>
To: Jack Howarth <howarth@bromo.med.uc.edu>
Cc: Dave Korn <dave.korn.cygwin@googlemail.com>, gcc@gcc.gnu.org
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On Mon, Jul 13, 2009 at 5:39 AM, Jack Howarth<howarth@bromo.med.uc.edu> wro=
te:
> On Mon, Jul 13, 2009 at 01:52:51AM +0100, Dave Korn wrote:
>> Richard Guenther wrote:
>> > On Sun, Jul 12, 2009 at 9:41 PM, Jack Howarth<howarth@bromo.med.uc.edu=
> wrote:
>> >> =A0 I am seeing a new failure on x86_64-apple-darwin10 in current gcc=
 4.4 branch
>> >> that wasn't present in the gcc 4.4.0 release. At -m32, the testsuite =
failure...
>> >>
>> >> FAIL: gcc.c-torture/compile/20000804-1.c =A0-O0 =A0(test for excess e=
rrors)
>>
>> =A0 Do you know what this test is supposed to be doing?
>>
>> > $ cat /gnu/gcc/gcc/gcc/testsuite/gcc.c-torture/compile/20000804-1.c
>> > /* This does not work on m68hc11 or h8300 due to the use of an asm
>> > =A0 =A0statement to force a 'long long' (64-bits) to go in a register.=
 =A0*/
>> > /* { dg-do assemble } */
>> > /* { dg-skip-if "" { { i?86-*-* x86_64-*-* } && ilp32 } { "-fpic" "-fP=
IC" } { ""
>> > =A0} } */
>> > /* { dg-skip-if "PIC default" { i?86-*-darwin* } { "*" } { "" } } */
>> > /* { dg-skip-if "No 64-bit registers" { m32c-*-* } { "*" } { "" } } */
>> > /* { dg-xfail-if "" { m6811-*-* m6812-*-* h8300-*-* } { "*" } { "" } }=
 */
>> >
>> > /* Copyright (C) 2000, 2003 Free Software Foundation */
>> > __complex__ long long f ()
>> > {
>> > =A0 int i[99];
>> > =A0 __complex__ long long v;
>> >
>> > =A0 v +=3D f ();
>>
>> =A0 Undefined behaviour, no?
>>
>> =A0 =A0 cheers,
>> =A0 =A0 =A0 DaveK
>
> So then the testcase is flawed and should have the darwin line corrected =
to...
>
> /* { dg-skip-if "PIC default" { { i?86-*-darwin* x86_64-*-darwin* } && il=
p32 } =A0{ "*" } { "" } } */

Probably yes.  The testcase invokes undefined behavior because
v is used uninitialized - but that may be the trigger for the original
ICE, so better preserve that.

Richard.

>
>
>