[Bug c/12362] Compiler generates incorrect code at -O2

["sean at mcneil dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12362


sean at mcneil dot com changed:

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


------- Additional Comments From sean at mcneil dot com  2003-09-22 14:47 -------
The code is not invalid.  To illustrate my point, I have removed all type
casting and I still get the erroneous code produced.  There is no illegal code here.

#define EARLY 4

typedef int (*FUNCPTR) ();

typedef struct
{
    FUNCPTR removeRtn;
    FUNCPTR calibrateRtn;
    FUNCPTR putRtn;
} Q_CLASS;

typedef struct
{
    Q_CLASS *pQClass;
} Q_HEAD;

typedef int Q_NODE;

typedef struct 
{
    int status;
    Q_NODE node;
} ID;

extern int ticks;
extern ID *id;
extern Q_HEAD queue;
extern Q_HEAD t_queue;

#define Q_REMOVE(pQHead,pQNode)						\
    (*(((pQHead))->pQClass->removeRtn))			\
    (((pQHead)), ((pQNode)))

#define Q_CALIBRATE(pQHead,keyDelta)					\
    (*(((pQHead))->pQClass->calibrateRtn))			\
    (((pQHead)), ((keyDelta)))

#define Q_PUT(pQHead,pQNode,key)					\
    (*(((pQHead))->pQClass->putRtn))				\
    (((pQHead)), ((pQNode)), (key))

int early (register int timeout)
{
    Q_REMOVE (&queue, &id->node);

    if ((unsigned)(ticks + timeout) < ticks)
    {
	Q_CALIBRATE (&t_queue, ~ticks + 1);
	ticks = 0;
    }

    Q_PUT (&queue, &id->node, timeout + ticks);
    id->status |= EARLY;

    return 0;
}