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ppc: Implement bcdus. instruction

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bcdus.: Decimal unsigned shift. This instruction works like bcds. but
considers only unsigned BCDs (no sign in least meaning 4 bits).

Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Jose Ricardo Ziviani 2017-01-10 00:10:11 -02:00 • committed by David Gibson
parent e04797f79e
commit a49a95e9e4
4 changed files with 46 additions and 1 deletions
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41
target/ppc/int_helper.c
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@ -3102,6 +3102,47 @@ uint32_t helper_bcds(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
return cr;
}
uint32_t helper_bcdus(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
{
int cr;
int i;
int invalid = 0;
bool ox_flag = false;
ppc_avr_t ret = *b;
for (i = 0; i < 32; i++) {
bcd_get_digit(b, i, &invalid);
if (unlikely(invalid)) {
return CRF_SO;
}
}
#if defined(HOST_WORDS_BIGENDIAN)
i = a->s8[7];
#else
i = a->s8[8];
#endif
if (i >= 32) {
ox_flag = true;
ret.u64[LO_IDX] = ret.u64[HI_IDX] = 0;
} else if (i <= -32) {
ret.u64[LO_IDX] = ret.u64[HI_IDX] = 0;
} else if (i > 0) {
ulshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], i * 4, &ox_flag);
} else {
urshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], -i * 4);
}
*r = ret;
cr = bcd_cmp_zero(r);
if (ox_flag) {
cr |= CRF_SO;
}
return cr;
}
void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
{
int i;