Xref: news2.mv.net comp.os.msdos.djgpp:2012
From: Chris Dial <cdial AT jeffnet DOT org>
Newsgroups: comp.os.msdos.djgpp
Subject: Is this ASM ok?
Date: Wed, 20 Mar 1996 18:02:26 -0800
Organization: Oregon Public Networking
Lines: 39
Message-ID: <3150B8B2.8B2@jeffnet.org>
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

Hi, I am pretty new to DJGPP and I have 2 questions about the below ASM 
code. #1: The below code compiles fine under DJGPP 2.0 when I use -O2 on 
the commandline, but if I use -O3 then GAS tells me that stosb is an 
unrecognized instruction. #2: I heard that you are supposed to tell 
DJGPP which registers you are messing with, how do I do this?


 asm(
  "cld
  movl _tscreen,%edi      /* Put tscreen into edi */
  movl _tcol1,%edx        /* Put tcol into edx */
  movl _tcolstep,%ebx     /* Put tcolstep into ebx */
  movl _tlength,%ecx      /* Put length into ecx */
  loopf:
  movb %dh,%al            /* Put color into eax */
  addl %ebx,%edx           /* Add colstep to col */
  stosb
  decl %ecx
  jnz loopf"              /* If ecx not zero goto loop */
  );


Thanks for any help you experienced pmode/DJGPP coders can give me!


-Chris Dial


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