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target-ppc: Implement bcd_is_valid function

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A function to check if all digits of a given BCD number is valid is
here presented because more instructions will need to reuse the
same code.

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 2016-12-06 17:40:04 -02:00 committed by David Gibson
parent 3259dbd9df
commit 071663dfc3
1 changed files with 20 additions and 7 deletions
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27
target/ppc/int_helper.c
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@ -2564,6 +2564,24 @@ static void bcd_put_digit(ppc_avr_t *bcd, uint8_t digit, int n)
}
}
static bool bcd_is_valid(ppc_avr_t *bcd)
{
int i;
int invalid = 0;
if (bcd_get_sgn(bcd) == 0) {
return false;
}
for (i = 1; i < 32; i++) {
bcd_get_digit(bcd, i, &invalid);
if (unlikely(invalid)) {
return false;
}
}
return true;
}
static int bcd_cmp_zero(ppc_avr_t *bcd)
{
if (bcd->u64[HI_IDX] == 0 && (bcd->u64[LO_IDX] >> 4) == 0) {
@ -2981,18 +2999,13 @@ uint32_t helper_bcdcpsgn(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
uint32_t helper_bcdsetsgn(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
{
int i;
int invalid = 0;
int sgnb = bcd_get_sgn(b);
*r = *b;
bcd_put_digit(r, bcd_preferred_sgn(sgnb, ps), 0);
for (i = 1; i < 32; i++) {
bcd_get_digit(b, i, &invalid);
if (unlikely(invalid)) {
return CRF_SO;
}
if (bcd_is_valid(b) == false) {
return CRF_SO;
}
return bcd_cmp_zero(r);