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From: Rich Felker <dalias@aerifal.cx>
To: musl@lists.openwall.com
Subject: Re: musl mips fails to compile with gcc 3.4.6
Date: Wed, 10 Oct 2012 20:07:39 -0400	[thread overview]
Message-ID: <20121011000738.GT254@brightrain.aerifal.cx> (raw)
In-Reply-To: <5075EDDD.1080904@barfooze.de>

On Wed, Oct 10, 2012 at 11:51:25PM +0200, John Spencer wrote:
> src/aio/aio_readwrite.c: In function `io_thread':
> ../arch/mips/pthread_arch.h:7: error: impossible constraint in `asm'
> __asm__ __volatile__ (".word 0x7c03e83b" : "=v" (self) );
> 
> 
> #ifdef __clang__
> 
> -->
> 
> #if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ < 4))
> 
> fixes it

I have a potential alternate fix: using

register pthread_t self __asm__("$3");

and "=r"(self) as the constraint. This should work on any gcc version
without incurring the extra cost of the clang-workaround. And it will
work with clang too if they ever fix their register allocator to work
with this kind of code.

Can you confirm whether or not it works?

Rich


  reply	other threads:[~2012-10-11  0:07 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-10 21:51 John Spencer
2012-10-11  0:07 ` Rich Felker [this message]
2012-10-18 23:09   ` John Spencer

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