target-ppc: Implement bcdcpsgn. instruction

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>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 23 insertions, 0 deletions

diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index fa7cfddab2..61762eebec 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -2920,6 +2920,29 @@ 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 invalid = 0;
+
+    if (bcd_get_sgn(a) == 0 || bcd_get_sgn(b) == 0) {
+        return CRF_SO;
+    }
+
+    *r = *a;
+    bcd_put_digit(r, b->u8[BCD_DIG_BYTE(0)] & 0xF, 0);
+
+    for (i = 1; i < 32; i++) {
+        bcd_get_digit(a, i, &invalid);
+        bcd_get_digit(b, i, &invalid);
+        if (unlikely(invalid)) {
+            return CRF_SO;
+        }
+    }
+
+    return bcd_cmp_zero(r);
+}
+
 void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
 {
     int i;