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target-ppc: Implement bcdcfsq. instruction

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bcdcfsq.: Decimal convert from signed quadword. It is not possible
to convert values less than -10^31-1 or greater than 10^31-1 to be
represented in packed decimal format.

Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
[dwg: Corrected constant which should be 10^16-1 but was 10^17-1]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Jose Ricardo Ziviani 2016-11-25 01:53:30 -02:00 committed by David Gibson
parent d59ba58380
commit a406c058e7
3 changed files with 46 additions and 0 deletions
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1
target/ppc/helper.h
View File

@ -377,6 +377,7 @@ 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_3(bcdcfsq, i32, avr, avr, i32)
DEF_HELPER_2(xsadddp, void, env, i32)
DEF_HELPER_2(xssubdp, void, env, i32)

38
target/ppc/int_helper.c
View File

@ -2842,6 +2842,44 @@ uint32_t helper_bcdctz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
return cr;
}
uint32_t helper_bcdcfsq(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
{
int i;
int cr = 0;
uint64_t lo_value;
uint64_t hi_value;
ppc_avr_t ret = { .u64 = { 0, 0 } };
if (b->s64[HI_IDX] < 0) {
lo_value = -b->s64[LO_IDX];
hi_value = ~b->u64[HI_IDX] + !lo_value;
bcd_put_digit(&ret, 0xD, 0);
} else {
lo_value = b->u64[LO_IDX];
hi_value = b->u64[HI_IDX];
bcd_put_digit(&ret, bcd_preferred_sgn(0, ps), 0);
}
if (divu128(&lo_value, &hi_value, 1000000000000000ULL) ||
lo_value > 9999999999999999ULL) {
cr = CRF_SO;
}
for (i = 1; i < 16; hi_value /= 10, i++) {
bcd_put_digit(&ret, hi_value % 10, i);
}
for (; i < 32; lo_value /= 10, i++) {
bcd_put_digit(&ret, lo_value % 10, i);
}
cr |= bcd_cmp_zero(&ret);
*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

@ -989,10 +989,14 @@ GEN_BCD2(bcdcfn)
GEN_BCD2(bcdctn)
GEN_BCD2(bcdcfz)
GEN_BCD2(bcdctz)
GEN_BCD2(bcdcfsq)
static void gen_xpnd04_1(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 2:
gen_bcdcfsq(ctx);
break;
case 4:
gen_bcdctz(ctx);
break;
@ -1014,6 +1018,9 @@ static void gen_xpnd04_1(DisasContext *ctx)
static void gen_xpnd04_2(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 2:
gen_bcdcfsq(ctx);
break;
case 4:
gen_bcdctz(ctx);
break;