Q67006: C1001: Internal Compiler Error: regMD.c:1.110, line 1017

Article: Q67006
Product(s): See article
Version(s): 6.00 6.00a | 6.00 6.00a
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | buglist6.00 buglist6.00a | mspl13_c
Last Modified: 18-NOV-1990

The sample code below will produce the following internal compiler
error when compiled with /Oe (global register allocation) or /Ox
optimization:

   file.c
   file.c(19) : fatal error C1001: Internal Compiler Error
                (compiler file '@(#)regMD.c:1.110', line 1017)
                Contact Microsoft Product Support Services

This problem appears to be related to the multiple structure member
assignments. To workaround this problem, simplify statements with
structure assignments as much as possible, disable global register
allocation by not using /Oe, or use the #optimize pragma to turn
global register allocation off for the particular functions where
problems occur.

Microsoft has confirmed this to be a problem in C versions 6.00 and
6.00a. We are researching this problem and will post new information
here as it becomes available.

Sample Code
-----------

#include <stdlib.h>

typedef struct {
                 short x0, y0, x1, y1;
               } BOX;

typedef struct {
                 long x0, y0, x1, y1;
               } LONG_RCT;

typedef LONG_RCT  *LONG_RCT_PTR;

LONG_RCT_PTR compute_extent(BOX *bound)
{
   static LONG_RCT rct;
   rct.x0 = (long) min(bound->x0, bound->x1);
   rct.y0 = (long) min(bound->y0, bound->y1);
   rct.x1 = (long) max(bound->x0, bound->x1);
   rct.y1 = (long) max(bound->y0, bound->y1);
   return(&rct);
}

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