target/arm: Split out make_svemte_desc

Share code that creates mtedesc and embeds within simd_desc.

Cc: qemu-stable@nongnu.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Gustavo Romero <gustavo.romero@linaro.org>
Message-id: 20240207025210.8837-5-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/tcg/translate-a64.h

@@ -28,6 +28,8 @@ bool logic_imm_decode_wmask(uint64_t *result, unsigned int immn,
 bool sve_access_check(DisasContext *s);
 bool sme_enabled_check(DisasContext *s);
 bool sme_enabled_check_with_svcr(DisasContext *s, unsigned);
+uint32_t make_svemte_desc(DisasContext *s, unsigned vsz, uint32_t nregs,
+                          uint32_t msz, bool is_write, uint32_t data);
 
 /* This function corresponds to CheckStreamingSVEEnabled. */
 static inline bool sme_sm_enabled_check(DisasContext *s)

target/arm/tcg/translate-sme.c

@@ -206,7 +206,7 @@ static bool trans_LDST1(DisasContext *s, arg_LDST1 *a)
 
     TCGv_ptr t_za, t_pg;
     TCGv_i64 addr;
-    int svl, desc = 0;
+    uint32_t desc;
     bool be = s->be_data == MO_BE;
     bool mte = s->mte_active[0];
 
@@ -224,18 +224,11 @@ static bool trans_LDST1(DisasContext *s, arg_LDST1 *a)
     tcg_gen_shli_i64(addr, cpu_reg(s, a->rm), a->esz);
     tcg_gen_add_i64(addr, addr, cpu_reg_sp(s, a->rn));
 
-    if (mte) {
-        desc = FIELD_DP32(desc, MTEDESC, MIDX, get_mem_index(s));
-        desc = FIELD_DP32(desc, MTEDESC, TBI, s->tbid);
-        desc = FIELD_DP32(desc, MTEDESC, TCMA, s->tcma);
-        desc = FIELD_DP32(desc, MTEDESC, WRITE, a->st);
-        desc = FIELD_DP32(desc, MTEDESC, SIZEM1, (1 << a->esz) - 1);
-        desc <<= SVE_MTEDESC_SHIFT;
-    } else {
+    if (!mte) {
         addr = clean_data_tbi(s, addr);
     }
-    svl = streaming_vec_reg_size(s);
-    desc = simd_desc(svl, svl, desc);
+
+    desc = make_svemte_desc(s, streaming_vec_reg_size(s), 1, a->esz, a->st, 0);
 
     fns[a->esz][be][a->v][mte][a->st](tcg_env, t_za, t_pg, addr,
                                       tcg_constant_i32(desc));

target/arm/tcg/translate-sve.c

@@ -4437,26 +4437,37 @@ static const uint8_t dtype_esz[16] = {
     3, 2, 1, 3
 };
 
-static void do_mem_zpa(DisasContext *s, int zt, int pg, TCGv_i64 addr,
-                       int dtype, uint32_t mte_n, bool is_write,
-                       gen_helper_gvec_mem *fn)
+uint32_t make_svemte_desc(DisasContext *s, unsigned vsz, uint32_t nregs,
+                          uint32_t msz, bool is_write, uint32_t data)
 {
-    unsigned vsz = vec_full_reg_size(s);
-    TCGv_ptr t_pg;
     uint32_t sizem1;
-    int desc = 0;
+    uint32_t desc = 0;
 
-    assert(mte_n >= 1 && mte_n <= 4);
-    sizem1 = (mte_n << dtype_msz(dtype)) - 1;
+    /* Assert all of the data fits, with or without MTE enabled. */
+    assert(nregs >= 1 && nregs <= 4);
+    sizem1 = (nregs << msz) - 1;
     assert(sizem1 <= R_MTEDESC_SIZEM1_MASK >> R_MTEDESC_SIZEM1_SHIFT);
+    assert(data < 1u << SVE_MTEDESC_SHIFT);
+
     if (s->mte_active[0]) {
         desc = FIELD_DP32(desc, MTEDESC, MIDX, get_mem_index(s));
         desc = FIELD_DP32(desc, MTEDESC, TBI, s->tbid);
         desc = FIELD_DP32(desc, MTEDESC, TCMA, s->tcma);
         desc = FIELD_DP32(desc, MTEDESC, WRITE, is_write);
         desc = FIELD_DP32(desc, MTEDESC, SIZEM1, sizem1);
         desc <<= SVE_MTEDESC_SHIFT;
-    } else {
+    }
+    return simd_desc(vsz, vsz, desc | data);
+}
+
+static void do_mem_zpa(DisasContext *s, int zt, int pg, TCGv_i64 addr,
+                       int dtype, uint32_t nregs, bool is_write,
+                       gen_helper_gvec_mem *fn)
+{
+    TCGv_ptr t_pg;
+    uint32_t desc;
+
+    if (!s->mte_active[0]) {
         addr = clean_data_tbi(s, addr);
     }
 
@@ -4465,7 +4476,8 @@ static void do_mem_zpa(DisasContext *s, int zt, int pg, TCGv_i64 addr,
      * registers as pointers, so encode the regno into the data field.
      * For consistency, do this even for LD1.
      */
-    desc = simd_desc(vsz, vsz, zt | desc);
+    desc = make_svemte_desc(s, vec_full_reg_size(s), nregs,
+                            dtype_msz(dtype), is_write, zt);
     t_pg = tcg_temp_new_ptr();
 
     tcg_gen_addi_ptr(t_pg, tcg_env, pred_full_reg_offset(s, pg));
@@ -5224,25 +5236,16 @@ static void do_mem_zpz(DisasContext *s, int zt, int pg, int zm,
                        int scale, TCGv_i64 scalar, int msz, bool is_write,
                        gen_helper_gvec_mem_scatter *fn)
 {
-    unsigned vsz = vec_full_reg_size(s);
     TCGv_ptr t_zm = tcg_temp_new_ptr();
     TCGv_ptr t_pg = tcg_temp_new_ptr();
     TCGv_ptr t_zt = tcg_temp_new_ptr();
-    int desc = 0;
-
-    if (s->mte_active[0]) {
-        desc = FIELD_DP32(desc, MTEDESC, MIDX, get_mem_index(s));
-        desc = FIELD_DP32(desc, MTEDESC, TBI, s->tbid);
-        desc = FIELD_DP32(desc, MTEDESC, TCMA, s->tcma);
-        desc = FIELD_DP32(desc, MTEDESC, WRITE, is_write);
-        desc = FIELD_DP32(desc, MTEDESC, SIZEM1, (1 << msz) - 1);
-        desc <<= SVE_MTEDESC_SHIFT;
-    }
-    desc = simd_desc(vsz, vsz, desc | scale);
+    uint32_t desc;
 
     tcg_gen_addi_ptr(t_pg, tcg_env, pred_full_reg_offset(s, pg));
     tcg_gen_addi_ptr(t_zm, tcg_env, vec_full_reg_offset(s, zm));
     tcg_gen_addi_ptr(t_zt, tcg_env, vec_full_reg_offset(s, zt));
+
+    desc = make_svemte_desc(s, vec_full_reg_size(s), 1, msz, is_write, scale);
     fn(tcg_env, t_zt, t_pg, t_zm, scalar, tcg_constant_i32(desc));
 }