[Qemu-ppc] [PULL 23/67] target-ppc: Implement bcd_is_valid function

[David Gibson]

From: Jose Ricardo Ziviani <address@hidden>

A function to check if all digits of a given BCD number is valid is
here presented because more instructions will need to reuse the
same code.

Signed-off-by: Jose Ricardo Ziviani <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
 target/ppc/int_helper.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 34dfe02..2bb628f 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -2596,6 +2596,24 @@ static void bcd_put_digit(ppc_avr_t *bcd, uint8_t digit, 
int n)
     }
 }
 
+static bool bcd_is_valid(ppc_avr_t *bcd)
+{
+    int i;
+    int invalid = 0;
+
+    if (bcd_get_sgn(bcd) == 0) {
+        return false;
+    }
+
+    for (i = 1; i < 32; i++) {
+        bcd_get_digit(bcd, i, &invalid);
+        if (unlikely(invalid)) {
+            return false;
+        }
+    }
+    return true;
+}
+
 static int bcd_cmp_zero(ppc_avr_t *bcd)
 {
     if (bcd->u64[HI_IDX] == 0 && (bcd->u64[LO_IDX] >> 4) == 0) {
@@ -3013,18 +3031,13 @@ uint32_t helper_bcdcpsgn(ppc_avr_t *r, ppc_avr_t *a, 
ppc_avr_t *b, uint32_t ps)
 
 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;
-        }
+    if (bcd_is_valid(b) == false) {
+        return CRF_SO;
     }
 
     return bcd_cmp_zero(r);
-- 
2.9.3