Q61620: Internal Compiler Error ‘@(#)regMD.c:1.100’ Line 3837

Article: Q61620
Product(s): See article
Version(s): 6.00   | 6.00
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | buglist6.00 | mspl13_c
Last Modified: 29-MAY-1990

The following sample code produces an internal compiler error when
compiled with /Oie (intrinsic AND global register allocation) options
under large and compact memory models:

   prog.c(17) : fatal error C1001: Internal Compiler Error
                (compiler file '@(#)regMD.c:1.00', line 3837)
                Contact Microsoft Product Support Services

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

unsigned x[4];
int *y;
int z;

void f1(void)
{
}

// #pragma function(memcpy)  This is one workaround.
// #pragma optimize("e", off)  This is another.
// #pragma optimize("i", off)  This is a third.

void f2(void)
{
   int i;

   for(i=0;i<4;i++)
      if(i<x[1])
         memcpy(&z,&(y[i]),2);
}
// #pragma intrinsic(memcpy) Turn intrinsics back on.
// #pragma optimize("e", on) Turn global register allocation back on.
// #pragma optimize("i", on) Turn intrinsics back on.

Placing the #pragma function(memcpy) in the code causes the compiler
to generate a function call to memcpy rather than to make it
intrinsic. Using the optimize pragma turns off the offending
optimization for that section of code. Since both /Oi and /Oe are
needed to cause the error, either pragma will work around the problem.

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

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