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 | 48 +++++++++++++++++++++++++++++++++++++
target/ppc/translate/vmx-impl.inc.c | 1 +
target/ppc/translate/vmx-ops.inc.c | 2 ++
4 files changed, 52 insertions(+)
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 065eb66..d1db462 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -400,6 +400,7 @@ 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(xsaddqp, void, env, i32)
diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 91ae89f..b184063 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -3175,6 +3175,54 @@ 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 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)
+ int i = a->s8[7];
+ ppc_avr_t bcd_one = { .u64 = { 0, 0x10 } };
+#else
+ int i = a->s8[8];
+ ppc_avr_t bcd_one = { .u64 = { 0x10, 0 } };
+#endif
+
+ if (bcd_is_valid(b) == false) {
+ return CRF_SO;
+ }
+
+ if (unlikely(i > 31)) {
+ i = 31;
+ } else if (unlikely(i < -31)) {
+ i = -31;
+ }
+
+ if (i > 0) {
+ ulshift(&ret.u64[LO_IDX], &ret.u64[HI_IDX], i * 4, &ox_flag);
+ } else {
+ 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 (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
