Q65307: M6110: MATH Floating-Point Error: Stack Overflow

Article: Q65307
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: 31-AUG-1990

When compiled with global register allocation optimization turned on,
the program produces the following error when executed:

   run-time error M6110: MATH
   - floating-point error: stack overflow

This error should not occur. This problem occurs in both DOS and OS/2
with either the emulator or 8087 math libraries.

You can work around the problem by doing the following:

1. Turn off global register allocation globally by not including the
   /Oe switch on the compile line, or turn it off locally with the
   #pragma optimize("e",off).

2. Compile with the /Op switch. This improves the accuracy of floating
   point calculations, but also slows execution.

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

#include <malloc.h>

//#pragma optimize("e",off) //uncomment this line and no error occurs

void func(float *x1,float *y1,float *x2,float *y2,float *x3,float *y3,
          unsigned size,float *xc1,float *yc1)
    {
    float   tx,ty ;

    while (size--)
        {
        //_asm nop          //uncomment this line and no error occurs
        tx = (*xc1 * *x1) - (*yc1 * *y1) ;
        ty = (*xc1 * *y1++) + (*yc1 * *x1++) ;
        *x3++ = (tx * *x2) - (ty * *y2) ;
        *y3++ = (tx * *y2++) + (ty * *x2++) ;
        }
    }

void main(void )
    {
    float   xx1[7],xx2[7],xx3[7],yy1[7],yy2[7],yy3[7] ;
    float   xn,yn ;
    unsigned    tsize = 7 ;

    xn = 1 ;
    yn = 0 ;
    func (xx1,xx2,xx3,yy1,yy2,yy3,tsize,&xn,&yn) ;
    }

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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