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Fixed error in carry calculation for MAC of the hwmult

This commit is contained in:
Mario Werner 2013-05-25 14:13:03 +02:00 committed by Daniel Beer
parent df6f0ec3bc
commit 6fe57b02e4
1 changed files with 9 additions and 5 deletions
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14
simio/simio_hwmult.c
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@ -70,6 +70,7 @@ static void hwmult_destroy(struct simio_device *dev)
static void do_multiply(struct hwmult *h)
{
uint32_t im;
uint64_t temp = 0;
/* Multiply */
if (h->mode & 2)
@ -79,16 +80,19 @@ static void do_multiply(struct hwmult *h)
/* Accumulate or store */
if (h->mode & 4)
h->result += im;
{
temp = (uint64_t)h->result + im;
h->result = temp;
}
else
h->result = im;
/* Set SUMEXT */
if (h->mode & 2)
if (h->mode & 2) /* MPYS and MACS */
h->sumext = (h->result & 0x80000000) ? 0xffff : 0;
else if (h->mode == MPY)
h->sumext = (h->result < im) ? 1 : 0;
else
else if(h->mode == MAC)
h->sumext = temp >> 32;
else /* MPY */
h->sumext = 0;
}