FIX: Incorrect Code Generated with /Og and /Oa or /Ow

MORE INFORMATION

Please refer to Help for more information about the compiler options /Og, /Oa, and /Ow.

The following sample demonstrates the bug. In this case, the problem appears to be related to the final attempt to access an array in a function when that access involves doubling the variable used to index it.

Sample Code

   //compiler options : cl /Og /Oa (or /Ow)
   #include <stdio.h>
   typedef struct C
   {
     float x,y,z;
     long  index;
     }C;

   float gdIn[3]={1.0,2.0,3.0};

   void init(C *gc)
   {
     float fd[3]={1.0,2.0,3.0};
     long   i = gc->index;
     float *pfd = gdIn;
     gc->x = *(pfd+0);
     gc->y = *(pfd+i);
     gc->z = *(pfd+i*2);
   }

   int main()
   {
     C c;
     c.index = 1;
     init(&c);
     printf("Should be 3.0, is %f \n", c.z);
     return 0;
   }
				

The program output should be: 3.0.

The program output is: 2.000000.