target-ppc: Implement bcdsetsgn. instruction

bcdsetsgn.: Decimal set sign. This instruction copies the register
value to the result register but adjust the signal according to
the preferred sign value.

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, 19 insertions, 0 deletions

diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 61762eebec..00d04c1fc6 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -2943,6 +2943,25 @@ uint32_t helper_bcdcpsgn(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
     return bcd_cmp_zero(r);
 }
 
+uint32_t helper_bcdsetsgn(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
+{
+    int i;
+    int invalid = 0;
+    int sgnb = bcd_get_sgn(b);
+
+    *r = *b;
+    bcd_put_digit(r, bcd_preferred_sgn(sgnb, ps), 0);
+
+    for (i = 1; i < 32; i++) {
+        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;