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target-ppc: Implement bcdctz. instruction

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bcdctz. converts from BCD to Zoned numeric format. Zoned format uses
a byte to represent a digit where the most significant nibble is 0x3
or 0xf, depending on the preferred signal.

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 2016-11-08 14:50:25 -02:00 committed by David Gibson
parent 38f4cb043b
commit 0a890b31df
3 changed files with 51 additions and 0 deletions
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1
target-ppc/helper.h
View File

@ -381,6 +381,7 @@ DEF_HELPER_4(bcdsub, i32, avr, avr, avr, i32)
DEF_HELPER_3(bcdcfn, i32, avr, avr, i32)
DEF_HELPER_3(bcdctn, i32, avr, avr, i32)
DEF_HELPER_3(bcdcfz, i32, avr, avr, i32)
DEF_HELPER_3(bcdctz, i32, avr, avr, i32)
DEF_HELPER_2(xsadddp, void, env, i32)
DEF_HELPER_2(xssubdp, void, env, i32)

43
target-ppc/int_helper.c
View File

@ -2831,6 +2831,49 @@ uint32_t helper_bcdcfz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
return cr;
}
uint32_t helper_bcdctz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
{
int i;
int cr = 0;
uint8_t digit = 0;
int sgnb = bcd_get_sgn(b);
int zone_lead = (ps) ? 0xF0 : 0x30;
int invalid = (sgnb == 0);
ppc_avr_t ret = { .u64 = { 0, 0 } };
int ox_flag = ((b->u64[HI_IDX] >> 4) != 0);
for (i = 0; i < 16; i++) {
digit = bcd_get_digit(b, i + 1, &invalid);
if (unlikely(invalid)) {
break;
}
ret.u8[BCD_DIG_BYTE(i * 2)] = zone_lead + digit;
}
if (ps) {
bcd_put_digit(&ret, (sgnb == 1) ? 0xC : 0xD, 1);
} else {
bcd_put_digit(&ret, (sgnb == 1) ? 0x3 : 0x7, 1);
}
cr = bcd_cmp_zero(b);
if (ox_flag) {
cr |= 1 << CRF_SO;
}
if (unlikely(invalid)) {
cr = 1 << CRF_SO;
}
*r = ret;
return cr;
}
void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
{
int i;

7
target-ppc/translate/vmx-impl.inc.c
View File

@ -988,10 +988,14 @@ GEN_BCD(bcdsub)
GEN_BCD2(bcdcfn)
GEN_BCD2(bcdctn)
GEN_BCD2(bcdcfz)
GEN_BCD2(bcdctz)
static void gen_xpnd04_1(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 4:
gen_bcdctz(ctx);
break;
case 5:
gen_bcdctn(ctx);
break;
@ -1010,6 +1014,9 @@ static void gen_xpnd04_1(DisasContext *ctx)
static void gen_xpnd04_2(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 4:
gen_bcdctz(ctx);
break;
case 6:
gen_bcdcfz(ctx);
break;