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ppc: Implement bcdtrunc. instruction 

bcdtrunc.: Decimal integer truncate. Given a BCD number in vrb and the
number of bytes to truncate in vra, the return register will have vrb
with such bits truncated.

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 18:08:32 -02:00 committed by David Gibson
parent 8178e89cbc
commit 31bc4d114a
4 changed files with 45 additions and 2 deletions
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1
target/ppc/helper.h
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@ -396,6 +396,7 @@ DEF_HELPER_3(bcdsetsgn, i32, avr, avr, i32)
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_2(xsadddp, void, env, i32)
DEF_HELPER_2(xsaddqp, void, env, i32)

37
target/ppc/int_helper.c
View File

@ -3191,6 +3191,43 @@ uint32_t helper_bcdsr(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
return cr;
}
uint32_t helper_bcdtrunc(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
{
uint64_t mask;
uint32_t ox_flag = 0;
#if defined(HOST_WORDS_BIGENDIAN)
int i = a->s16[3] + 1;
#else
int i = a->s16[4] + 1;
#endif
ppc_avr_t ret = *b;
if (bcd_is_valid(b) == false) {
return CRF_SO;
}
if (i > 16 && i < 32) {
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;
}
bcd_put_digit(&ret, bcd_preferred_sgn(bcd_get_sgn(b), ps), 0);
*r = ret;
return bcd_cmp_zero(&ret) | ox_flag;
}
void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
{
int i;

5
target/ppc/translate/vmx-impl.inc.c
View File

@ -1019,6 +1019,7 @@ GEN_BCD(bcdcpsgn);
GEN_BCD(bcds);
GEN_BCD(bcdus);
GEN_BCD(bcdsr);
GEN_BCD(bcdtrunc);
static void gen_xpnd04_1(DisasContext *ctx)
{
@ -1097,6 +1098,10 @@ GEN_VXFORM_DUAL(vsubudm, PPC2_ALTIVEC_207, PPC_NONE, \
bcds, PPC_NONE, PPC2_ISA300)
GEN_VXFORM_DUAL(vsubuwm, PPC_ALTIVEC, PPC_NONE, \
bcdus, PPC_NONE, PPC2_ISA300)
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)
static void gen_vsbox(DisasContext *ctx)
{

4
target/ppc/translate/vmx-ops.inc.c
View File

@ -143,14 +143,14 @@ GEN_VXFORM(vaddsws, 0, 14),
GEN_VXFORM_DUAL(vsububs, bcdadd, 0, 24, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM_DUAL(vsubuhs, bcdsub, 0, 25, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM(vsubuws, 0, 26),
GEN_VXFORM(vsubsbs, 0, 28),
GEN_VXFORM_DUAL(vsubsbs, bcdtrunc, 0, 28, PPC_NONE, PPC2_ISA300),
GEN_VXFORM(vsubshs, 0, 29),
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(vsubuqm, 0, 20),
GEN_VXFORM_207(vsubcuq, 0, 21),
GEN_VXFORM_DUAL(vsubuqm, bcdtrunc, 0, 20, 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),