Date: Wed, 27 Jun 2001 02:16:48 +0900 (JST) From: kaz@kobe1995.net (NAKAMURA Kazushi) To: obrien@FreeBSD.ORG Cc: Alexander@Leidinger.net, sobomax@FreeBSD.ORG, current@FreeBSD.ORG, djhill@novagate.net Subject: Re: GNU ld(1) dumps core Message-ID: <200106261716.CAA02226@ns.kobe1995.net> In-Reply-To: Your message of "Tue, 26 Jun 2001 07:23:57 -0700". <20010626072357.B11396@dragon.nuxi.com>
next in thread | previous in thread | raw e-mail | index | archive | help
In article <20010626072357.B11396@dragon.nuxi.com>
obrien@FreeBSD.ORG writes:
>> Oops. I wanted to say: Every software which has a problem with ld
>> dumping core uses nasm (so far). The core dump is a bug in ld, but I
>> didn't know if the condition which triggers the core dump is a problem
>> with nasm, the input of nasm, or a bug in ld.
>
>If someone could provide me with the minal input to nasm which then fed
>to `ld' dumps core, it would really speed up a fix. :-)
Not only nasm, but also gas has same problem. In case of
ports/audio/gogo and ports/audio/lame, nasm outputs object which
make ld dumps core. While gcc+gas outputs object which can't link
by ld. I think the problem occures when "SSE instructions" and
"align" are used. (Unfortunatry, most SSE instructions need
16Byte(=128bit) alined operands.) For example:
==> bug.C <==
/* test program for SSE by kaz @ kobe1995.net
% c++ -g bug.C && ./a.out
But it fails. So,
% c++ -g -S bug.C
And change loop.s to avoid bug of gcc (may be):
#APP
- movaps ($A.15),%xmm0
- movaps ($B.16),%xmm1
+ movaps A.15,%xmm0
+ movaps B.16,%xmm1
#NO_APP
% c++ loop.s && ./a.out
*/
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
main(){
static float __attribute__((aligned(16)))
A[4]={1.,1.,1.,1.},
B[4]={0.,1.,2.,3.},
C[4];
int i;
printf("float A=(");
for(i=0;i<4;i++) printf("%f,",A[i]);
printf("\b)\n");
printf("float B=(");
for(i=0;i<4;i++) printf("%f,",B[i]);
printf("\b)\n");
asm("movaps (%0),%%xmm0" //SSE
:
:"g"(A));
asm("movaps (%0),%%xmm1" //SSE
:
:"g"(B));
asm("addps %xmm1,%xmm0"); //SSE
// asm("mulps %xmm1,%xmm0"); //SSE
asm("movaps %%xmm0,%0":"=g"(C)); //SSE
printf("float C=(");
for(i=0;i<4;i++) printf("%f,",C[i]);
printf("\b)\n");
}
--
<mailto:kaz@kobe1995.net> NAKAMURA Kazushi@KOBE
<http://kobe1995.net/~kaz/index-e.html>;
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200106261716.CAA02226>