On Sat, Dec 03, 2016 at 03:00:04AM -0200, Jose Ricardo Ziviani wrote:
> bcdsr.: Decimal shift and round. This instruction works like bcds.
> however, when performing right shift, 1 will be added to the
> result if the last digit was >= 5.
>
> Signed-off-by: Jose Ricardo Ziviani <jos...@linux.vnet.ibm.com>
> ---
> target-ppc/helper.h | 1 +
> target-ppc/int_helper.c | 45
> +++++++++++++++++++++++++++++++++++++
> target-ppc/translate/vmx-impl.inc.c | 1 +
> target-ppc/translate/vmx-ops.inc.c | 2 ++
> 4 files changed, 49 insertions(+)
>
> diff --git a/target-ppc/helper.h b/target-ppc/helper.h
> index 386ea67..d9528eb 100644
> --- a/target-ppc/helper.h
> +++ b/target-ppc/helper.h
> @@ -394,6 +394,7 @@ DEF_HELPER_4(bcdcpsgn, i32, avr, avr, avr, i32)
> 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_2(xsadddp, void, env, i32)
> DEF_HELPER_2(xssubdp, void, env, i32)
> diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
> index 4b5eea1..c9fcb1a 100644
> --- a/target-ppc/int_helper.c
> +++ b/target-ppc/int_helper.c
> @@ -3124,6 +3124,51 @@ uint32_t helper_bcdus(ppc_avr_t *r, ppc_avr_t *a,
> ppc_avr_t *b, uint32_t ps)
> return cr;
> }
>
> +uint32_t helper_bcdsr(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
> +{
> + int cr;
> + int i;
> + int unused = 0;
> + int invalid = 0;
> + bool ox_flag = false;
> + int sgnb = bcd_get_sgn(b);
> + ppc_avr_t ret = *b;
> + ret.u64[LO_IDX] &= ~0xf;
> +
> +#if defined(HOST_WORDS_BIGENDIAN)
> + ppc_avr_t bcd_one = { .u64 = { 0, 0x10 } };
> + int upper = ARRAY_SIZE(a->s32) - 1;
Same comment as previous patches about the shift argument.
> +#else
> + ppc_avr_t bcd_one = { .u64 = { 0x10, 0 } };
> + int upper = 0;
> +#endif
> +
> + if (bcd_is_valid(b) == false) {
> + return CRF_SO;
> + }
> +
> + if (a->s32[upper] > 0) {
> + i = (a->s32[upper] > 31) ? 31 : a->s32[upper];
> + ulshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], i * 4, &ox_flag);
> + } else {
> + i = (a->s32[upper] < -31) ? 31 : -a->s32[upper];
> + urshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], i * 4);
> +
> + if (bcd_get_digit(&ret, 0, &invalid) >= 5) {
So, the ISA actually says you increment only if the last digit is >
5. That doesn't seem like correct rounding, so it might be an error
in the ISA document - best check this with the hardware people.
> + bcd_add_mag(&ret, &ret, &bcd_one, &invalid, &unused);
> + }
> + }
> + bcd_put_digit(&ret, bcd_preferred_sgn(sgnb, ps), 0);
> +
> + cr = bcd_cmp_zero(&ret);
> + if (unlikely(ox_flag)) {
> + cr |= CRF_SO;
> + }
> + *r = ret;
> +
> + return cr;
> +}
> +
> void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
> {
> int i;
> diff --git a/target-ppc/translate/vmx-impl.inc.c
> b/target-ppc/translate/vmx-impl.inc.c
> index fc54881..451abb5 100644
> --- a/target-ppc/translate/vmx-impl.inc.c
> +++ b/target-ppc/translate/vmx-impl.inc.c
> @@ -1018,6 +1018,7 @@ GEN_BCD2(bcdsetsgn)
> GEN_BCD(bcdcpsgn);
> GEN_BCD(bcds);
> GEN_BCD(bcdus);
> +GEN_BCD(bcdsr);
>
> static void gen_xpnd04_1(DisasContext *ctx)
> {
> diff --git a/target-ppc/translate/vmx-ops.inc.c
> b/target-ppc/translate/vmx-ops.inc.c
> index cdd3abe..fa9c996 100644
> --- a/target-ppc/translate/vmx-ops.inc.c
> +++ b/target-ppc/translate/vmx-ops.inc.c
> @@ -132,6 +132,8 @@ GEN_HANDLER_E_2(vprtybd, 0x4, 0x1, 0x18, 9, 0, PPC_NONE,
> PPC2_ISA300),
> GEN_HANDLER_E_2(vprtybq, 0x4, 0x1, 0x18, 10, 0, PPC_NONE, PPC2_ISA300),
>
> GEN_VXFORM_DUAL(vsubcuw, xpnd04_1, 0, 22, PPC_ALTIVEC, PPC_NONE),
> +GEN_VXFORM_300(bcdsr, 0, 23),
> +GEN_VXFORM_300(bcdsr, 0, 31),
> GEN_VXFORM_DUAL(vaddubs, vmul10uq, 0, 8, PPC_ALTIVEC, PPC_NONE),
> GEN_VXFORM_DUAL(vadduhs, vmul10euq, 0, 9, PPC_ALTIVEC, PPC_NONE),
> GEN_VXFORM(vadduws, 0, 10),
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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