From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jack Andrews" <effbiae@gmail.com>
Subject: inline asm mmx: how to movq from memory to %mmX
Date: Tue, 17 Apr 2007 23:28:50 +1000
Message-ID: <2cf50a010704170628r3f4229c3lad2b58743c63462e@mail.gmail.com>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Return-path: <linux-assembly-owner@vger.kernel.org>
DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed;
        d=gmail.com; s=beta;
        h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition;
        b=lg7mZYG613TIpt+Trq5ujSbQHqVru/sj9X5I5kam1AO62/5yO9dlimiVQ48tiWNrE5jSsLTRaZUvgYYyfCToosgi7+LKrt7DSmjMgrMixP+CJvEwlo1V19pZWv2K0h9jClJPdbCd5cXPTweOaX6Mb5ZYAE9vnoXx7VxaRTcT/mU=
Content-Disposition: inline
Sender: linux-assembly-owner@vger.kernel.org
List-Id: <linux-assembly.vger.kernel.org>
Content-Type: text/plain; charset="us-ascii"; format="flowed"
To: linux-assembly@vger.kernel.org

hi lin-asm,

i am trying to do some vector addition using MMX and inline assembly
in GCC.  my code follows.

i want the function 'simd' to do the same as 'sisd'

i get these errors when i try to compile:

[jack@fedora i]$ gcc -mmmx v.c
/tmp/ccWXntVc.s: Assembler messages:
/tmp/ccWXntVc.s:19: Error: suffix or operands invalid for `movq'
/tmp/ccWXntVc.s:20: Error: junk `%mm0' after register

[jack@fedora i]$ gcc -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/u
sr/share/info --enable-shared --enable-threads=posix --enable-checking=release -
-with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-
libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable
-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.
0/jre --with-cpu=generic --host=i386-redhat-linux
Thread model: posix
gcc version 4.1.0 20060304 (Red Hat 4.1.0-3)


[jack@fedora i]$ cat v.c
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

typedef long I;
typedef char C;
#define IZ sizeof(I)
#define W 2

simd(n, is)
I *is;
{   I i;
    asm("pxor %mm0,%mm0");
    for (i=0; i < n; i += W) {
        asm("movq %0 %%mm1\n\t"
            "paddq %%mm1 %%mm0"
            :
            :"m"(is[i])           );
    }
    return 0;
}

sisd(n, is)
I *is;
{
    I i = 0, j = 0;
    for (i = 0; i < n; i++)
        j += is[i];
    return j;
}

main(c, v)
C **v;
{
    I n = atol(v[1]),
        z = atol(v[2]), m = atol(v[3]), *is = malloc(IZ * (z *= W));
    I result;
    printf("IZ=%d, %s\n",IZ,m?"SIMD":"SISD");
    while (n--)
        result=m?simd(z, is):sisd(z, is);
    printf("%d\n",result);