[Bug middle-end/25206] for loop with comma operator problem

["efim at lipowsky dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #2 from efim at lipowsky dot de  2005-12-01 15:55 -------
Subject: Re:  for loop with comma operator problem

pinskia at gcc dot gnu dot org schrieb:

>------- Comment #1 from pinskia at gcc dot gnu dot org  2005-12-01 15:28 -------
>HUH? Can you give the full source/ reduced source and give a little more
>detailed explication on what is going wrong.
>
>
>  
>

in the file you can see a snapshort with two arrows to read and store 
addresses.
It is very simple source.

static BYTE CommTxBuf[COMM_BUF_SIZE];
static BYTE * CommTxBufHead = CommTxBuf;
static BYTE * CommTxBufTail = CommTxBuf;
static WORD CommTxNum = 0;

static void comm_txisr (void) __attribute__ ((interrupt ("IRQ")));
static void comm_txisr(void)
{
DWORD tmp;
BYTE n;

    if(CommTxNum)
    {
        tmp = 0;
        for (n = 0; n < 3 && CommTxNum; n++, CommTxNum--)
        {
                tmp |= (DWORD)(*CommTxBufTail) << ((n + 1) * 8);

                if (++CommTxBufTail >= &CommTxBuf[COMM_BUF_SIZE])
                    CommTxBufTail = CommTxBuf;
        }
        tmp |= (DWORD)n;

        while (comm_putchar(tmp))
            ;
    }

    VICVectAddr = 0;        // Update VIC priorities
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25206