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/* { dg-do compile } */

/* { dg-options "-O2" } */

/* This was causing PRE to insert the value of the ADDR variable, to

   remove the invariant cast but in doing so, it was creating a

   non-invariant expression out of the invariant one, causing a later

   failure in PRE.  */

struct sMCB {

  unsigned char type;

};

extern void foo (void);

unsigned char mem_readb(char *pt) __attribute__((nothrow));

void DOS_FreeProcessMemory(unsigned short pspseg) {

        while (1) {

                if (pspseg)

                        foo ();

                char *addr = (char*)(&((sMCB*)0)->type);

                if (mem_readb(addr)==0x5a) break;

        }

};