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ppc: Implement bcdutrunc. instruction

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bcdutrunc. Decimal unsigned truncate. Works like bcdtrunc. with
unsigned BCD numbers.

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 2017-01-12 18:08:33 -02:00 committed by David Gibson
parent 31bc4d114a
commit 5c32e2e4a0
4 changed files with 57 additions and 1 deletions
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1
target/ppc/helper.h
View file

@ -397,6 +397,7 @@ DEF_HELPER_4(bcds, i32, avr, avr, avr, i32)
DEF_HELPER_4(bcdus, i32, avr, avr, avr, i32)
DEF_HELPER_4(bcdsr, i32, avr, avr, avr, i32)
DEF_HELPER_4(bcdtrunc, i32, avr, avr, avr, i32)
DEF_HELPER_4(bcdutrunc, i32, avr, avr, avr, i32)
DEF_HELPER_2(xsadddp, void, env, i32)
DEF_HELPER_2(xsaddqp, void, env, i32)

51
target/ppc/int_helper.c
View file

@ -3228,6 +3228,57 @@ uint32_t helper_bcdtrunc(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
return bcd_cmp_zero(&ret) | ox_flag;
}
uint32_t helper_bcdutrunc(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
{
int i;
uint64_t mask;
uint32_t ox_flag = 0;
int invalid = 0;
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->s16[3];
#else
i = a->s16[4];
#endif
if (i > 16 && i < 33) {
mask = (uint64_t)-1 >> (128 - i * 4);
if (ret.u64[HI_IDX] & ~mask) {
ox_flag = CRF_SO;
}
ret.u64[HI_IDX] &= mask;
} else if (i > 0 && i <= 16) {
mask = (uint64_t)-1 >> (64 - i * 4);
if (ret.u64[HI_IDX] || (ret.u64[LO_IDX] & ~mask)) {
ox_flag = CRF_SO;
}
ret.u64[LO_IDX] &= mask;
ret.u64[HI_IDX] = 0;
} else if (i == 0) {
if (ret.u64[HI_IDX] || ret.u64[LO_IDX]) {
ox_flag = CRF_SO;
}
ret.u64[HI_IDX] = ret.u64[LO_IDX] = 0;
}
*r = ret;
if (r->u64[HI_IDX] == 0 && r->u64[LO_IDX] == 0) {
return ox_flag | CRF_EQ;
}
return ox_flag | CRF_GT;
}
void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
{
int i;

4
target/ppc/translate/vmx-impl.inc.c
View file

@ -1020,6 +1020,7 @@ GEN_BCD(bcds);
GEN_BCD(bcdus);
GEN_BCD(bcdsr);
GEN_BCD(bcdtrunc);
GEN_BCD(bcdutrunc);
static void gen_xpnd04_1(DisasContext *ctx)
{
@ -1102,6 +1103,9 @@ GEN_VXFORM_DUAL(vsubsbs, PPC_ALTIVEC, PPC_NONE, \
bcdtrunc, PPC_NONE, PPC2_ISA300)
GEN_VXFORM_DUAL(vsubuqm, PPC2_ALTIVEC_207, PPC_NONE, \
bcdtrunc, PPC_NONE, PPC2_ISA300)
GEN_VXFORM_DUAL(vsubcuq, PPC2_ALTIVEC_207, PPC_NONE, \
bcdutrunc, PPC_NONE, PPC2_ISA300)
static void gen_vsbox(DisasContext *ctx)
{

2
target/ppc/translate/vmx-ops.inc.c
View file

@ -149,8 +149,8 @@ GEN_VXFORM_DUAL(vsubsws, xpnd04_2, 0, 30, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM_207(vadduqm, 0, 4),
GEN_VXFORM_207(vaddcuq, 0, 5),
GEN_VXFORM_DUAL(vaddeuqm, vaddecuq, 30, 0xFF, PPC_NONE, PPC2_ALTIVEC_207),
GEN_VXFORM_207(vsubcuq, 0, 21),
GEN_VXFORM_DUAL(vsubuqm, bcdtrunc, 0, 20, PPC2_ALTIVEC_207, PPC2_ISA300),
GEN_VXFORM_DUAL(vsubcuq, bcdutrunc, 0, 21, PPC2_ALTIVEC_207, PPC2_ISA300),
GEN_VXFORM_DUAL(vsubeuqm, vsubecuq, 31, 0xFF, PPC_NONE, PPC2_ALTIVEC_207),
GEN_VXFORM(vrlb, 2, 0),
GEN_VXFORM(vrlh, 2, 1),