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 342fb41..cfef25f 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->s8) - 1; +#else + ppc_avr_t bcd_one = { .u64 = { 0x10, 0 } }; + int upper = 0; +#endif + + if (bcd_is_valid(b) == false) { + return CRF_SO; + } + + if (a->s8[upper] > 0) { + i = (a->s8[upper] > 31) ? 31 : a->s8[upper]; + ulshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], i * 4, &ox_flag); + } else { + i = (a->s8[upper] < -31) ? 31 : -a->s8[upper]; + urshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], i * 4); + + if (bcd_get_digit(&ret, 0, &invalid) >= 5) { + 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), -- 2.7.4