From: "Kevin D. Kissell" <kevink@mips.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
"Daniel Jacobowitz" <dan@debian.org>
Cc: <linux-mips@oss.sgi.com>
Subject: Re: [PATCH] incorrect asm constraints for ll/sc constructs
Date: Fri, 25 May 2001 23:15:48 +0200 [thread overview]
Message-ID: <011801c0e55f$e4d39820$0deca8c0@Ulysses> (raw)
In-Reply-To: Pine.GSO.3.96.1010525130531.17652A-100000@delta.ds2.pg.gda.pl
> The following program cannot be compiled with gcc 2.95.3, because the
> offset is out of range (I consider it a bug in gcc -- it should allocate
> and load a temporary register itself and pass it appropriately as %0,
I think gcc can be forgiven for not allocating a temporary,
given the ".set noat"...
> matching the "R" constraint; still it's better than generating bad code):
>
> int main(void)
> {
> int *p;
>
> asm volatile(".set push\n\t"
> ".set noat\n\t"
> "lw $0,%0\n\t"
> ".set pop"
> :
> : "R" (p[0x10000]));
>
> return 0;
> }
WARNING: multiple messages have this Message-ID (diff)
From: "Kevin D. Kissell" <kevink@mips.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
Daniel Jacobowitz <dan@debian.org>
Cc: linux-mips@oss.sgi.com
Subject: Re: [PATCH] incorrect asm constraints for ll/sc constructs
Date: Fri, 25 May 2001 23:15:48 +0200 [thread overview]
Message-ID: <011801c0e55f$e4d39820$0deca8c0@Ulysses> (raw)
Message-ID: <20010525211548.NU6MjkW6HZdM3CQNvdIzma3zizS72kEXEdIkJ7P7TdM@z> (raw)
In-Reply-To: Pine.GSO.3.96.1010525130531.17652A-100000@delta.ds2.pg.gda.pl
> The following program cannot be compiled with gcc 2.95.3, because the
> offset is out of range (I consider it a bug in gcc -- it should allocate
> and load a temporary register itself and pass it appropriately as %0,
I think gcc can be forgiven for not allocating a temporary,
given the ".set noat"...
> matching the "R" constraint; still it's better than generating bad code):
>
> int main(void)
> {
> int *p;
>
> asm volatile(".set push\n\t"
> ".set noat\n\t"
> "lw $0,%0\n\t"
> ".set pop"
> :
> : "R" (p[0x10000]));
>
> return 0;
> }
next prev parent reply other threads:[~2001-05-25 21:11 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-23 21:52 [PATCH] incorrect asm constraints for ll/sc constructs Daniel Jacobowitz
2001-05-24 13:42 ` Maciej W. Rozycki
2001-05-24 23:44 ` Daniel Jacobowitz
2001-05-25 13:13 ` Maciej W. Rozycki
2001-05-25 21:15 ` Kevin D. Kissell [this message]
2001-05-25 21:15 ` Kevin D. Kissell
2001-05-25 21:49 ` Daniel Jacobowitz
2001-05-26 22:14 ` Kevin D. Kissell
2001-05-26 22:14 ` Kevin D. Kissell
2001-05-26 22:23 ` Ralf Baechle
2001-05-28 11:20 ` Maciej W. Rozycki
2001-05-28 13:48 ` Kevin D. Kissell
2001-05-28 13:48 ` Kevin D. Kissell
2001-05-28 13:59 ` Maciej W. Rozycki
2001-05-25 20:27 ` Ralf Baechle
2001-05-25 20:49 ` Daniel Jacobowitz
2001-05-28 11:09 ` Maciej W. Rozycki
2001-05-30 0:17 ` Daniel Jacobowitz
2001-05-30 7:02 ` Kevin D. Kissell
2001-05-30 7:02 ` Kevin D. Kissell
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