target/arm: Split out gen_gvec_fn_zz

Model the new function on gen_gvec_fn2 in translate-a64.c, but
indicating which kind of register and in which order.  Since there
is only one user of do_vector2_z, fold it into do_mov_z.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200815013145.539409-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/translate-sve.c

@@ -143,15 +143,13 @@ static int pred_gvec_reg_size(DisasContext *s)
 }
 
 /* Invoke a vector expander on two Zregs.  */
-static bool do_vector2_z(DisasContext *s, GVecGen2Fn *gvec_fn,
-                         int esz, int rd, int rn)
+
+static void gen_gvec_fn_zz(DisasContext *s, GVecGen2Fn *gvec_fn,
+                           int esz, int rd, int rn)
 {
-    if (sve_access_check(s)) {
-        unsigned vsz = vec_full_reg_size(s);
-        gvec_fn(esz, vec_full_reg_offset(s, rd),
-                vec_full_reg_offset(s, rn), vsz, vsz);
-    }
-    return true;
+    unsigned vsz = vec_full_reg_size(s);
+    gvec_fn(esz, vec_full_reg_offset(s, rd),
+            vec_full_reg_offset(s, rn), vsz, vsz);
 }
 
 /* Invoke a vector expander on three Zregs.  */
@@ -170,7 +168,10 @@ static bool do_vector3_z(DisasContext *s, GVecGen3Fn *gvec_fn,
 /* Invoke a vector move on two Zregs.  */
 static bool do_mov_z(DisasContext *s, int rd, int rn)
 {
-    return do_vector2_z(s, tcg_gen_gvec_mov, 0, rd, rn);
+    if (sve_access_check(s)) {
+        gen_gvec_fn_zz(s, tcg_gen_gvec_mov, MO_8, rd, rn);
+    }
+    return true;
 }
 
 /* Initialize a Zreg with replications of a 64-bit immediate.  */