Date: Mon, 23 Sep 2002 15:43:44 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: "David O'Brien" <obrien@FreeBSD.org> Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org, Mikhail Teterin <mi+mx@aldan.algebra.com>, Mike Barcroft <mike@FreeBSD.org> Subject: Re: cvs commit: src/contrib/gcc toplev.c Message-ID: <XFMail.20020923154344.jhb@FreeBSD.org> In-Reply-To: <20020923192518.GA78132@dragon.nuxi.com>
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On 23-Sep-2002 David O'Brien wrote:
> On Mon, Sep 23, 2002 at 02:30:11PM -0400, Mike Barcroft wrote:
>> Mikhail Teterin <mi+mx@aldan.algebra.com> writes:
>> > On Sunday 22 September 2002 03:26 am, David E. O'Brien wrote:
>> > = obrien 2002/09/22 00:26:39 PDT
>> > =
>> > = Modified files:
>> > = contrib/gcc toplev.c
>> > = Log:
>> > = Turn off the "-O2 flag TRIGGERS KNOWN OPTIMIZER BUGS" warning.
>> >
>> > What about x86 (and -current)? Is it safe to use -O2?
>>
>> Not yet. See PR 40209.
>
> Not being able to use -O2 is due to a code bug in FreeBSD's code. Not
> due to GCC optimizer bugs. I feel it is safe to give -O2 a try on
> people's own code now.
Is it due to stuff in __asm restraints that diff's like these would fix:
--- i386/i386/math_emulate.c 20 Jun 2002 07:23:08 -0000 1.41
+++ i386/i386/math_emulate.c 17 Jul 2002 02:53:57 -0000
@@ -760,8 +760,7 @@
if ((ti.sign = (ti.b < 0)) != 0)
__asm__("notl %0 ; notl %1\n\t"
"addl $1,%0 ; adcl $0,%1"
- :"=r" (ti.a),"=r" (ti.b)
- :"0" (ti.a),"1" (ti.b));
+ :"+r" (ti.a),"+r" (ti.b));
int_to_real(&ti,tmp);
}
(etc.. I have a bunch of these)
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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