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From: mintha@unixg.ubc.ca (Jim Mintha)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Closing AES boxes interfering with VDI drawing
Summary: using gcc and assembly
Keywords: aes dialog gcc asm
Message-ID: <1990Dec19.221105.5886@unixg.ubc.ca>
Date: 19 Dec 90 22:11:05 GMT
References: <3391@medusainformatik.uni-erlangen.de> <1990Dec18.161238.24031@unixg.ubc.ca> <4545@ruuinf.cs.ruu.nl>
Sender: news@unixg.ubc.ca (Usenet News Account)
Organization: University of British Columbia, Vancouver, B.C., Canada
Lines: 24


    On a related topic, does anyone who is using gcc know how the asm
command works?  I can't seem to find any information on in it in the
info system in emacs.  I want to do a loop to move the screen up one
line in assembly, but I can't seem to get it to use labels.
I want to do something like this: (somewhat simplified)
  
    asm ("movel %0,a0" :: "a" (scrbase))   /* load a0 screen adr   */
    asm ("movel %0,a0" :: "a" (scrbase2))  /* destination (1 line down) */
    asm ("movew %0,d0" :: "d" (size))      /* number of long words */
    asm ("loop: movel (a1)+,(a0)+")        /* copy the memory      */
    asm ("dbf d0,loop")                    /* --1 and branch       */

My assembly is a little shakey, but I was able to get it to work with
megamax C, but the above GCC version won't work.
Jim (email  mintha@geog.ubc.ca)



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Jim Mintha					University of British Columbia
Programming Assistant				Geography Department
e-mail: mintha@geog.ubc.ca			Vancouver, B.C.