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target-ppc: Implement bcdcfz. instruction

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bcdcfz. converts from Zoned numeric format to BCD. 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 14:50:24 -02:00 committed by David Gibson
parent e2106d73d0
commit 38f4cb043b
3 changed files with 52 additions and 0 deletions
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1
target-ppc/helper.h
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@ -380,6 +380,7 @@ DEF_HELPER_4(bcdadd, i32, avr, avr, avr, i32)
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_2(xsadddp, void, env, i32)
DEF_HELPER_2(xssubdp, void, env, i32)

44
target-ppc/int_helper.c
View File

@ -2787,6 +2787,50 @@ uint32_t helper_bcdctn(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
return cr;
}
uint32_t helper_bcdcfz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
{
int i;
int cr = 0;
int invalid = 0;
int zone_digit = 0;
int zone_lead = ps ? 0xF : 0x3;
int digit = 0;
ppc_avr_t ret = { .u64 = { 0, 0 } };
int sgnb = b->u8[BCD_DIG_BYTE(0)] >> 4;
if (unlikely((sgnb < 0xA) && ps)) {
invalid = 1;
}
for (i = 0; i < 16; i++) {
zone_digit = (i * 2) ? b->u8[BCD_DIG_BYTE(i * 2)] >> 4 : zone_lead;
digit = b->u8[BCD_DIG_BYTE(i * 2)] & 0xF;
if (unlikely(zone_digit != zone_lead || digit > 0x9)) {
invalid = 1;
break;
}
bcd_put_digit(&ret, digit, i + 1);
}
if ((ps && (sgnb == 0xB || sgnb == 0xD)) ||
(!ps && (sgnb & 0x4))) {
bcd_put_digit(&ret, BCD_NEG_PREF, 0);
} else {
bcd_put_digit(&ret, BCD_PLUS_PREF_1, 0);
}
cr = bcd_cmp_zero(&ret);
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

@ -987,6 +987,7 @@ GEN_BCD(bcdadd)
GEN_BCD(bcdsub)
GEN_BCD2(bcdcfn)
GEN_BCD2(bcdctn)
GEN_BCD2(bcdcfz)
static void gen_xpnd04_1(DisasContext *ctx)
{
@ -994,6 +995,9 @@ static void gen_xpnd04_1(DisasContext *ctx)
case 5:
gen_bcdctn(ctx);
break;
case 6:
gen_bcdcfz(ctx);
break;
case 7:
gen_bcdcfn(ctx);
break;
@ -1006,6 +1010,9 @@ static void gen_xpnd04_1(DisasContext *ctx)
static void gen_xpnd04_2(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 6:
gen_bcdcfz(ctx);
break;
case 7:
gen_bcdcfn(ctx);
break;