target/hppa: Implement HAVG

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/hppa/helper.h

@@ -16,6 +16,7 @@ DEF_HELPER_FLAGS_1(ldc_check, TCG_CALL_NO_RWG, void, tl)
 
 DEF_HELPER_FLAGS_2(hadd_ss, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(hadd_us, TCG_CALL_NO_RWG_SE, i64, i64, i64)
+DEF_HELPER_FLAGS_2(havg, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(hsub_ss, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(hsub_us, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 

target/hppa/insns.decode

@@ -214,6 +214,8 @@ hadd            000010 ..... ..... 00000011 11 0 .....  @rrr
 hadd_ss         000010 ..... ..... 00000011 01 0 .....  @rrr
 hadd_us         000010 ..... ..... 00000011 00 0 .....  @rrr
 
+havg            000010 ..... ..... 00000010 11 0 .....  @rrr
+
 hsub            000010 ..... ..... 00000001 11 0 .....  @rrr
 hsub_ss         000010 ..... ..... 00000001 01 0 .....  @rrr
 hsub_us         000010 ..... ..... 00000001 00 0 .....  @rrr

target/hppa/op_helper.c

@@ -410,6 +410,20 @@ uint64_t HELPER(hadd_us)(uint64_t r1, uint64_t r2)
     return ret;
 }
 
+uint64_t HELPER(havg)(uint64_t r1, uint64_t r2)
+{
+    uint64_t ret = 0;
+
+    for (int i = 0; i < 64; i += 16) {
+        int f1 = extract64(r1, i, 16);
+        int f2 = extract64(r2, i, 16);
+        int fr = f1 + f2;
+
+        ret = deposit64(ret, i, 16, (fr >> 1) | (fr & 1));
+    }
+    return ret;
+}
+
 uint64_t HELPER(hsub_ss)(uint64_t r1, uint64_t r2)
 {
     uint64_t ret = 0;

target/hppa/translate.c

@@ -2804,6 +2804,11 @@ static bool trans_hadd_us(DisasContext *ctx, arg_rrr *a)
     return do_multimedia(ctx, a, gen_helper_hadd_us);
 }
 
+static bool trans_havg(DisasContext *ctx, arg_rrr *a)
+{
+    return do_multimedia(ctx, a, gen_helper_havg);
+}
+
 static bool trans_hsub(DisasContext *ctx, arg_rrr *a)
 {
     return do_multimedia(ctx, a, tcg_gen_vec_sub16_i64);