From: muta...@gmail.com   
      
   Hi.   
      
   We have previously discussed laying out the PM16   
   selectors. And I remember we agreed that the code   
   selectors and data selectors needed to be   
   intermingled to provide a somewhat flat (ie not   
   really flat, more consecutive) address space.   
      
   Anyway, I recently purchased Visual Studio 1.52   
   from ebay and it runs under Windows and produces   
   real memory code, and the huge memory model is   
   pretty good, and in fact, I think Microsoft C 5.1   
   generated the same/similar code.   
      
   However, I'm not sure whether this is sufficient to   
   do PM16 the way I want.   
      
   Apparently it IS sufficient to do PM16. There is a   
   AHSHIFT and an AHINCR (not generated in this   
   case). But just because it works for PM16 the way   
   Windows does it, doesn't mean it will work for the   
   way I want to do PDOS/286.   
      
   Note that Watcom is completely flexible - it calls an   
   external function to manipulate huge pointers.   
      
   So my question is - is the Visual Studio-generated code   
   sufficient for a somewhat-flat address space that we   
   previously discussed? It's flat from the perspective of   
   the C programmer, who has access to 16 MiB on an   
   80286 and access to (what did we say? 256 MiB I   
   think - on PM16 on an 80386 - and 512 MiB on PM32   
   with D-bits set to 16-bit, maybe?).   
      
   Thanks. Paul.   
      
      
      
   D:\scratch\xxx>type foo.c   
   char *foo(char *in, long x)   
   {   
   return (in + x);   
   }   
      
   D:\scratch\xxx>cl /AH /Fa /c foo.c   
   Microsoft (R) C/C++ Optimizing Compiler Version 8.00c   
   Copyright (c) Microsoft Corp 1984-1993. All rights reserved.   
      
   foo.c   
      
   D:\scratch\xxx>type foo.asm   
    File foo.c   
    Line 2   
    in = 0006   
    x = 000a   
   _foo:   
           push    bp   
           mov     bp,sp   
           mov     ax,OFFSET L00106   
           call    FAR PTR __aFchkstk   
           push    si   
           push    di   
    Line 3   
           mov     ax,WORD PTR 10[bp]   
           mov     dx,WORD PTR 12[bp]   
           mov     cx,WORD PTR 6[bp]   
           mov     bx,WORD PTR 8[bp]   
           add     ax,cx   
           adc     dx,OFFSET 0   
           mov     cx,OFFSET __AHSHIFT   
           shl     dx,cx   
           add     dx,bx   
           jmp     L00105   
    Line 4   
    Line 4   
   L00105:   
           pop     di   
           pop     si   
           mov     sp,bp   
           pop     bp   
           ret     OFFSET 0   
      
   D:\scratch\xxx>   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)