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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Chuck Ebbert <cebbert@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
	akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [patch 06/10] Immediate Value - i386 Optimization
Date: Tue, 03 Jul 2007 16:10:31 -0700	[thread overview]
Message-ID: <468AD767.10700@goop.org> (raw)
In-Reply-To: <468AB390.7000608@redhat.com>

Chuck Ebbert wrote:
> On 07/03/2007 04:18 PM, H. Peter Anvin wrote:
>   
>> One could, though, use an indirect jump to achieve, if not as good, at
>> least most of the effect:
>>
>> 	movl	$<patchable>,<reg>
>> 	jmp	*<reg>
>>
>>     
>
> Yeah, but there's this GCC bug:
>
> 	http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22448
>
> You can't even dereference labels in an ASM statement.

I was told in absolute terms that any use of &&label other than to pass 
it to goto was not supported, and would not be supported.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29305

Seems that passing to an asm() falls into the same class of problem I 
had.  I think the underlying problem is that if the code containing the 
label is in an inlined function or unrolled loop, the reference can't be 
resolved properly anyway.

    J

  parent reply	other threads:[~2007-07-03 23:10 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-03 16:40 [patch 00/10] Immediate Values Mathieu Desnoyers
2007-07-03 16:40 ` [patch 01/10] Immediate values - Global modules list and module mutex Mathieu Desnoyers
2007-07-03 16:40 ` [patch 02/10] Immediate Value - Architecture Independent Code Mathieu Desnoyers
2007-07-03 16:40 ` [patch 03/10] Immediate Values - Non Optimized Architectures Mathieu Desnoyers
2007-07-03 16:40 ` [patch 04/10] Immediate Value - Add kconfig menus Mathieu Desnoyers
2007-07-03 16:40 ` [patch 05/10] Immediate Values - kprobe header fix Mathieu Desnoyers
2007-07-03 16:40 ` [patch 06/10] Immediate Value - i386 Optimization Mathieu Desnoyers
2007-07-03 18:45   ` H. Peter Anvin
2007-07-03 19:16     ` Mathieu Desnoyers
2007-07-03 20:18       ` H. Peter Anvin
2007-07-03 20:37         ` Chuck Ebbert
2007-07-03 21:30           ` H. Peter Anvin
2007-07-03 23:10           ` Jeremy Fitzhardinge [this message]
2007-07-03 20:43         ` Mathieu Desnoyers
2007-07-03 21:30           ` H. Peter Anvin
2007-07-03 16:40 ` [patch 07/10] Immediate Value - PowerPC Optimization Mathieu Desnoyers
2007-07-03 16:40 ` [patch 08/10] Immediate Value - Documentation Mathieu Desnoyers
2007-07-03 16:40 ` [patch 09/10] F00F bug fixup for i386 - use immediate values Mathieu Desnoyers
2007-07-04 20:43   ` Alexey Dobriyan
2007-07-03 16:40 ` [patch 10/10] Scheduler profiling - Use " Mathieu Desnoyers
2007-07-03 18:11   ` Alexey Dobriyan
2007-07-03 18:57     ` Mathieu Desnoyers
2007-07-04 14:23       ` Adrian Bunk
2007-07-04 20:31       ` Alexey Dobriyan
2007-07-05 20:21       ` Andrew Morton
2007-07-05 20:29         ` Andrew Morton
2007-07-05 20:41           ` Mathieu Desnoyers
2007-07-06 11:44         ` Andi Kleen
2007-07-06 17:50           ` Li, Tong N
2007-07-06 20:03             ` Andi Kleen
2007-07-06 20:57               ` Li, Tong N
2007-07-06 21:03                 ` Mathieu Desnoyers
2007-07-07  1:50             ` [patch 10/10] *Tests* " Mathieu Desnoyers
2007-07-07  6:08               ` Li, Tong N
2007-07-11  5:02                 ` Mathieu Desnoyers
2007-07-06 22:14           ` [patch 10/10] " Chuck Ebbert
2007-07-06 23:28             ` Adrian Bunk
2007-07-06 23:38               ` Dave Jones
2007-07-07  0:10                 ` Adrian Bunk
2007-07-07 15:45                   ` Frank Ch. Eigler
2007-07-07 17:01                     ` Adrian Bunk
2007-07-07 17:20                       ` Willy Tarreau
2007-07-07 17:59                         ` Adrian Bunk
2007-07-07 17:55                       ` Frank Ch. Eigler
2007-07-06 23:43               ` Mathieu Desnoyers
2007-07-07  2:25                 ` Adrian Bunk
2007-07-07  2:35                   ` Mathieu Desnoyers
2007-07-07  4:03                     ` Adrian Bunk
2007-07-07  5:02                       ` Willy Tarreau
2007-07-04 20:35   ` Alexey Dobriyan
2007-07-04 22:41     ` Andi Kleen

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