From: Damon Hogan <damonh AT pgmincorporated DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problems with DJGPP lib and grx23
Date: Wed, 22 Dec 1999 18:19:39 -0700
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

My apologies, I didn't get all the messages before, looks like there has been
quite a discussion on this subject..

Was it clear? Does the GRX23UP1 file fix this problem?

Damon Hogan wrote:

> Since he did not write back, on this I will.  I am having the same problem..
>
> I cannot get the grx23 library to compile on djgpp running under
> windows95/98/NT4.   I have the latest gcc for djgpp 295... I have tried
> everything I can think of and worked on it for days.  Most everything I
> have for djgpp compiles fine but this library and a few others that use
> in-line assembly are having this same compile problem.  (Forbidden
> registers, AX, CX, DX it doesn't seem to matter.)
>
> gcc -c -O6 -Wall -fomit-frame-pointer -I. -I./include -I../include
> -I../addons/p
> rint -I../addons/bmp utils/shiftscl.c -o utils/shiftscl.o
> utils/shiftscl.c: In function `_GR_shift_scanline':
> utils/shiftscl.c:48: Invalid `asm' statement:
> utils/shiftscl.c:48: fixed or forbidden register 2 (cx) was spilled for
> class CR
> EG.
> utils/shiftscl.c:102: Invalid `asm' statement:
> utils/shiftscl.c:102: fixed or forbidden register 2 (cx) was spilled
> for
> class C
> REG.
> make.exe[1]: *** [utils/shiftscl.o] Error 1
> make.exe[1]: Leaving directory `c:/djgpp/contrib/grx23/src'
> make.exe: *** [libs] Error 2
>
> C:\djgpp\contrib\grx23>
>
> Below is the code it blows up on (src/utils/shiftscl.c), Blowup line
> below denoted with a <><>.  Can you tell me what can be done so it will
> compile (preferred) or
> if you can at lease email me the .a library files for djgpp that would
> be sufficient.
>
> Thanks in advance
>
> Damon Hogan
> Sr Programmer/Analyst
> PGM, Inc.
>
> #     if defined(__GNUC__) && defined(__i386__)
>  int w = ws;
>  /* sad but true: the x86 bytesex forces this inefficient code :( */
>  asm volatile ("\n"
>    "   movb    (%3),%%ch    \n"
>    "   jmp     1f           \n"
>    "   .align  4,0x90       \n"
>    "1: decl    %3           \n"
>    "   movb    %%ch,%%al    \n"
>    "   movb    (%3),%%ah    \n"
>    "   movb    %%ah,%%ch    \n"
>    "   shrl    %%cl,%%eax   \n"
>    "   movb    %%al,(%4)    \n"
>    "   decl    %4           \n"
>    "   decl    %5           \n"
>    "   jne     1b           \n"
>    "   shrb    %%cl,%%ch    \n"
>    "   movb    %%ch,(%4)      "
>    : "=r" ((void *)s), "=r" ((void *)d), "=r" ((int)w)
>    : "0" ((void *)s), "1" ((void *)d), "2" ((int)w), "c" ((int)shift)
> <><>          : "ax", "cx"
>         );
> #     elif defined(__TURBOC__)
>  asm     push  ds           ;
>  asm     mov   bx, ws       ;
>  asm     mov   cl, shift    ;
>  asm     les   di, d        ;
>  asm     lds   si, s        ;
>  asm     mov   ch,[si]      ;
>  asm     std                ;
>   looprv:
>  asm     dec   si           ;
>  asm     mov   al, ch       ;
>  asm     mov   ah, [si]     ;
>  asm     mov   ch, ah       ;
>  asm     shr   ax, cl       ;
>  asm     stosb              ;
>  asm     dec   bx           ;
>  asm     jnz   short looprv ;
>  asm     mov   al, ch       ;
>  asm     shr   al, cl       ;
>  asm     stosb              ;
>  asm     pop   ds           ;
> #     else
>  int w = ws;
>  do {
>    --s;
>    *(d--) = highlowP(s)>>shift;
>  } while (--w);
>  *d = *s >> shift;
> #     endif
>
> And so it blows up on the line..
>
>  : "ax", "cx"
>
> When throwing away registers at the end of the assembly routine because the
> contents of those registers has changed...
>
> Everything I have read so far says that this is valid...  So I can't fix
> something that
> is supposed to work..
>
> Any suggestions?
>
> Nate Eldredge wrote:
>
> > Anton Helm <tony AT dictator DOT nt DOT tuwien DOT ac DOT at> writes:
> >
> > > Is there some asm guru out there that can look into a 10-line inline asm
> > > code that used to work with gcc 2.8.1 ?
> >
> > Post it.
> >
> > --
> >
> > Nate Eldredge
> > neldredge AT hmc DOT edu