s390x/tcg: Implement VECTOR SHIFT RIGHT ARITHMETIC

Similar to VECTOR SHIFT LEFT ARITHMETIC. Add s390_vec_sar() similar to
s390_vec_shr().

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/target/s390x/vec_int_helper.c b/target/s390x/vec_int_helper.c
index 3df069f033..67e9f2b0ed 100644
--- a/target/s390x/vec_int_helper.c
+++ b/target/s390x/vec_int_helper.c
@@ -49,6 +49,26 @@ static void s390_vec_shl(S390Vector *d, const S390Vector *a, uint64_t count)
     }
 }
 
+static void s390_vec_sar(S390Vector *d, const S390Vector *a, uint64_t count)
+{
+    uint64_t tmp;
+
+    if (count == 0) {
+        d->doubleword[0] = a->doubleword[0];
+        d->doubleword[1] = a->doubleword[1];
+    } else if (count == 64) {
+        d->doubleword[1] = a->doubleword[0];
+        d->doubleword[0] = 0;
+    } else if (count < 64) {
+        tmp = a->doubleword[1] >> count;
+        d->doubleword[1] = deposit64(tmp, 64 - count, count, a->doubleword[0]);
+        d->doubleword[0] = (int64_t)a->doubleword[0] >> count;
+    } else {
+        d->doubleword[1] = (int64_t)a->doubleword[0] >> (count - 64);
+        d->doubleword[0] = 0;
+    }
+}
+
 static void s390_vec_shr(S390Vector *d, const S390Vector *a, uint64_t count)
 {
     uint64_t tmp;
@@ -535,3 +555,9 @@ void HELPER(gvec_vsl)(void *v1, const void *v2, uint64_t count,
 {
     s390_vec_shl(v1, v2, count);
 }
+
+void HELPER(gvec_vsra)(void *v1, const void *v2, uint64_t count,
+                       uint32_t desc)
+{
+    s390_vec_sar(v1, v2, count);
+}