[Qemu-devel] [PATCH 3/4] target-ppc: Implement bcdcpsgn. instruction

[Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>]

bcdcpsgn.: Decimal copy sign. Given two registers vra and vrb, it
copies the vra value with vrb sign to the result register vrt.

Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
---
 target-ppc/helper.h                 |  1 +
 target-ppc/int_helper.c             | 30 ++++++++++++++++++++++++++++++
 target-ppc/translate/vmx-impl.inc.c |  3 +++
 target-ppc/translate/vmx-ops.inc.c  |  2 +-
 4 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 503f257..dada48e 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -384,6 +384,7 @@ DEF_HELPER_3(bcdcfz, i32, avr, avr, i32)
 DEF_HELPER_3(bcdctz, i32, avr, avr, i32)
 DEF_HELPER_3(bcdcfsq, i32, avr, avr, i32)
 DEF_HELPER_3(bcdctsq, i32, avr, avr, i32)
+DEF_HELPER_4(bcdcpsgn, 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 1025438..a215bfe 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -2961,6 +2961,36 @@ uint32_t helper_bcdctsq(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
     return cr;
 }
 
+uint32_t helper_bcdcpsgn(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
+{
+    int i;
+    int cr = 0;
+    int sgna = bcd_get_sgn(a);
+    int sgnb = bcd_get_sgn(b);
+    int invalid = (sgna == 0) || (sgnb == 0);
+    ppc_avr_t ret = { .u64 = { 0, 0 } };
+
+    for (i = 1; i < 32; i++) {
+        bcd_put_digit(&ret, bcd_get_digit(a, i, &invalid), i);
+        bcd_get_digit(b, i, &invalid);
+
+        if (unlikely(invalid)) {
+            break;
+        }
+    }
+    bcd_put_digit(&ret, bcd_get_digit(b, 0, &invalid), 0);
+
+    cr = bcd_cmp_zero(a);
+
+    if (unlikely(invalid)) {
+        cr = 1 << 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 1579b58..c14b666 100644
--- a/target-ppc/translate/vmx-impl.inc.c
+++ b/target-ppc/translate/vmx-impl.inc.c
@@ -991,6 +991,7 @@ GEN_BCD2(bcdcfz)
 GEN_BCD2(bcdctz)
 GEN_BCD2(bcdcfsq)
 GEN_BCD2(bcdctsq)
+GEN_BCD(bcdcpsgn);
 
 static void gen_xpnd04_1(DisasContext *ctx)
 {
@@ -1056,6 +1057,8 @@ GEN_VXFORM_DUAL(vsubuhm, PPC_ALTIVEC, PPC_NONE, \
                 bcdsub, PPC_NONE, PPC2_ALTIVEC_207)
 GEN_VXFORM_DUAL(vsubuhs, PPC_ALTIVEC, PPC_NONE, \
                 bcdsub, PPC_NONE, PPC2_ALTIVEC_207)
+GEN_VXFORM_DUAL(vaddshs, PPC_ALTIVEC, PPC_NONE, \
+                bcdcpsgn, PPC_NONE, PPC2_ISA300)
 
 static void gen_vsbox(DisasContext *ctx)
 {
diff --git a/target-ppc/translate/vmx-ops.inc.c b/target-ppc/translate/vmx-ops.inc.c
index f02b3be..70d7d2b 100644
--- a/target-ppc/translate/vmx-ops.inc.c
+++ b/target-ppc/translate/vmx-ops.inc.c
@@ -131,7 +131,7 @@ 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),
 GEN_VXFORM(vaddsbs, 0, 12),
-GEN_VXFORM(vaddshs, 0, 13),
+GEN_VXFORM_DUAL(vaddshs, bcdcpsgn, 0, 13, PPC_ALTIVEC, PPC_NONE),
 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),
-- 
2.7.4