[Bug c/91107] __attribute__((pure)) to function with non-const pointers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91107

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
This function isn't pure.  GCC would optimize

 dest[0] = 0.;
 array_division (n, dest, src1, src2);
 return dest[0];

to return 0.0 since pure functions are assumed to not write to (global) memory.