target/arm: Tidy handle_vec_simd_shri

Now that we've converted all cases to gvec, there is quite a bit
of dead code at the end of the function.  Remove it.

Sink the call to gen_gvec_fn2i to the end, loading a function
pointer within the switch statement.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200513163245.17915-6-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 14 insertions, 42 deletions

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 2d7dad6c3f..d5e77f34a7 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -10155,16 +10155,7 @@ static void handle_vec_simd_shri(DisasContext *s, bool is_q, bool is_u,
     int size = 32 - clz32(immh) - 1;
     int immhb = immh << 3 | immb;
     int shift = 2 * (8 << size) - immhb;
-    bool accumulate = false;
-    int dsize = is_q ? 128 : 64;
-    int esize = 8 << size;
-    int elements = dsize/esize;
-    MemOp memop = size | (is_u ? 0 : MO_SIGN);
-    TCGv_i64 tcg_rn = new_tmp_a64(s);
-    TCGv_i64 tcg_rd = new_tmp_a64(s);
-    TCGv_i64 tcg_round;
-    uint64_t round_const;
-    int i;
+    GVecGen2iFn *gvec_fn;
 
     if (extract32(immh, 3, 1) && !is_q) {
         unallocated_encoding(s);
@@ -10178,13 +10169,12 @@ static void handle_vec_simd_shri(DisasContext *s, bool is_q, bool is_u,
 
     switch (opcode) {
     case 0x02: /* SSRA / USRA (accumulate) */
-        gen_gvec_fn2i(s, is_q, rd, rn, shift,
-                      is_u ? gen_gvec_usra : gen_gvec_ssra, size);
-        return;
+        gvec_fn = is_u ? gen_gvec_usra : gen_gvec_ssra;
+        break;
 
     case 0x08: /* SRI */
-        gen_gvec_fn2i(s, is_q, rd, rn, shift, gen_gvec_sri, size);
-        return;
+        gvec_fn = gen_gvec_sri;
+        break;
 
     case 0x00: /* SSHR / USHR */
         if (is_u) {
@@ -10192,49 +10182,31 @@ static void handle_vec_simd_shri(DisasContext *s, bool is_q, bool is_u,
                 /* Shift count the same size as element size produces zero.  */
                 tcg_gen_gvec_dup_imm(size, vec_full_reg_offset(s, rd),
                                      is_q ? 16 : 8, vec_full_reg_size(s), 0);
-            } else {
-                gen_gvec_fn2i(s, is_q, rd, rn, shift, tcg_gen_gvec_shri, size);
+                return;
             }
+            gvec_fn = tcg_gen_gvec_shri;
         } else {
             /* Shift count the same size as element size produces all sign.  */
             if (shift == 8 << size) {
                 shift -= 1;
             }
-            gen_gvec_fn2i(s, is_q, rd, rn, shift, tcg_gen_gvec_sari, size);
+            gvec_fn = tcg_gen_gvec_sari;
         }
-        return;
+        break;
 
     case 0x04: /* SRSHR / URSHR (rounding) */
-        gen_gvec_fn2i(s, is_q, rd, rn, shift,
-                      is_u ? gen_gvec_urshr : gen_gvec_srshr, size);
-        return;
+        gvec_fn = is_u ? gen_gvec_urshr : gen_gvec_srshr;
+        break;
 
     case 0x06: /* SRSRA / URSRA (accum + rounding) */
-        gen_gvec_fn2i(s, is_q, rd, rn, shift,
-                      is_u ? gen_gvec_ursra : gen_gvec_srsra, size);
-        return;
+        gvec_fn = is_u ? gen_gvec_ursra : gen_gvec_srsra;
+        break;
 
     default:
         g_assert_not_reached();
     }
 
-    round_const = 1ULL << (shift - 1);
-    tcg_round = tcg_const_i64(round_const);
-
-    for (i = 0; i < elements; i++) {
-        read_vec_element(s, tcg_rn, rn, i, memop);
-        if (accumulate) {
-            read_vec_element(s, tcg_rd, rd, i, memop);
-        }
-
-        handle_shri_with_rndacc(tcg_rd, tcg_rn, tcg_round,
-                                accumulate, is_u, size, shift);
-
-        write_vec_element(s, tcg_rd, rd, i, size);
-    }
-    tcg_temp_free_i64(tcg_round);
-
-    clear_vec_high(s, is_q, rd);
+    gen_gvec_fn2i(s, is_q, rd, rn, shift, gvec_fn, size);
 }
 
 /* SHL/SLI - Vector shift left */