From: Segher Boessenkool <segher@kernel•crashing.org>
To: Arnd Bergmann <arnd@arndb•de>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: 440 ebony patch seems to have broken 85xx build on powerpc.git
Date: Fri, 25 May 2007 00:08:28 +0200 [thread overview]
Message-ID: <bd721e3985ba0b54ea1a00c2f4acd993@kernel.crashing.org> (raw)
In-Reply-To: <200705242316.29713.arnd@arndb.de>
> 1. Pass -Wa,-many to gcc
> This will really allow any possible instruction to be assembled,
> including
> the old POWER architecture, but also includes all the other strange
> stuff like -maltivec, -mspe, -me500, ...
And it doesn't prevent the compiler from compiling insns
that can never work on the platform; for example, the
compiler in the original bug report will happily put isel
insns all over the place.
> 2. protect the use of special instructions with .machine directives.
> You can write all the inline assemblies like
>
> .machine push
> .machine 440
> <440 specific instruction>
> .machine pop
>
> This should work in any reasonably recent version of binutils, meaning
> that we don't need to pass stuff like -Wa,-m440 any more.
[You don't need the assembler flag at all, just the compiler
flag -mcpu=440].
This of course works, but is ultra-silly to do in a file
that will never run on anything other than 440 systems.
Segher
next prev parent reply other threads:[~2007-05-24 22:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-24 17:13 440 ebony patch seems to have broken 85xx build on powerpc.git Dave Jiang
2007-05-24 17:37 ` Josh Boyer
2007-05-24 17:43 ` Dave Jiang
2007-05-24 18:02 ` Sergei Shtylyov
2007-05-24 18:09 ` Josh Boyer
2007-05-25 1:27 ` David Gibson
2007-05-24 19:05 ` Segher Boessenkool
2007-05-24 19:39 ` Josh Boyer
2007-05-24 20:18 ` Segher Boessenkool
2007-05-24 20:21 ` Arnd Bergmann
2007-05-24 20:24 ` Josh Boyer
2007-05-24 21:07 ` Mark A. Greer
2007-05-24 21:16 ` Arnd Bergmann
2007-05-24 22:08 ` Segher Boessenkool [this message]
2007-05-24 22:03 ` Segher Boessenkool
2007-05-24 22:02 ` Segher Boessenkool
2007-05-25 1:30 ` David Gibson
2007-05-25 14:01 ` Segher Boessenkool
2007-05-24 22:09 ` Segher Boessenkool
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