target/arm: Convert disas_data_proc_3src to decodetree

This includes MADD, MSUB, SMADDL, SMSUBL, UMADDL, UMSUBL, SMULH, UMULH.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241211163036.2297116-15-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 59 insertions, 76 deletions

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index 27a3101..b0cc8bd 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -753,6 +753,22 @@ SUBS_ext        . 11 01011001 ..... ... ... ..... .....     @addsub_ext
 # Conditional select
 # Data Processing (3-source)
 
+&rrrr           rd rn rm ra
+@rrrr           . .. ........ rm:5 . ra:5 rn:5 rd:5     &rrrr
+
+MADD_w          0 00 11011000 ..... 0 ..... ..... ..... @rrrr
+MSUB_w          0 00 11011000 ..... 1 ..... ..... ..... @rrrr
+MADD_x          1 00 11011000 ..... 0 ..... ..... ..... @rrrr
+MSUB_x          1 00 11011000 ..... 1 ..... ..... ..... @rrrr
+
+SMADDL          1 00 11011001 ..... 0 ..... ..... ..... @rrrr
+SMSUBL          1 00 11011001 ..... 1 ..... ..... ..... @rrrr
+UMADDL          1 00 11011101 ..... 0 ..... ..... ..... @rrrr
+UMSUBL          1 00 11011101 ..... 1 ..... ..... ..... @rrrr
+
+SMULH           1 00 11011010 ..... 0 11111 ..... ..... @rrr
+UMULH           1 00 11011110 ..... 0 11111 ..... ..... @rrr
+
 ### Cryptographic AES
 
 AESE            01001110 00 10100 00100 10 ..... .....  @r2r_q1e0
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index d570bbb..99ff787 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -7955,98 +7955,68 @@ TRANS(SUB_r, do_addsub_reg, a, true, false)
 TRANS(ADDS_r, do_addsub_reg, a, false, true)
 TRANS(SUBS_r, do_addsub_reg, a, true, true)
 
-/* Data-processing (3 source)
- *
- *    31 30  29 28       24 23 21  20  16  15  14  10 9    5 4    0
- *  +--+------+-----------+------+------+----+------+------+------+
- *  |sf| op54 | 1 1 0 1 1 | op31 |  Rm  | o0 |  Ra  |  Rn  |  Rd  |
- *  +--+------+-----------+------+------+----+------+------+------+
- */
-static void disas_data_proc_3src(DisasContext *s, uint32_t insn)
+static bool do_mulh(DisasContext *s, arg_rrr *a,
+                    void (*fn)(TCGv_i64, TCGv_i64, TCGv_i64, TCGv_i64))
 {
-    int rd = extract32(insn, 0, 5);
-    int rn = extract32(insn, 5, 5);
-    int ra = extract32(insn, 10, 5);
-    int rm = extract32(insn, 16, 5);
-    int op_id = (extract32(insn, 29, 3) << 4) |
-        (extract32(insn, 21, 3) << 1) |
-        extract32(insn, 15, 1);
-    bool sf = extract32(insn, 31, 1);
-    bool is_sub = extract32(op_id, 0, 1);
-    bool is_high = extract32(op_id, 2, 1);
-    bool is_signed = false;
-    TCGv_i64 tcg_op1;
-    TCGv_i64 tcg_op2;
-    TCGv_i64 tcg_tmp;
-
-    /* Note that op_id is sf:op54:op31:o0 so it includes the 32/64 size flag */
-    switch (op_id) {
-    case 0x42: /* SMADDL */
-    case 0x43: /* SMSUBL */
-    case 0x44: /* SMULH */
-        is_signed = true;
-        break;
-    case 0x0: /* MADD (32bit) */
-    case 0x1: /* MSUB (32bit) */
-    case 0x40: /* MADD (64bit) */
-    case 0x41: /* MSUB (64bit) */
-    case 0x4a: /* UMADDL */
-    case 0x4b: /* UMSUBL */
-    case 0x4c: /* UMULH */
-        break;
-    default:
-        unallocated_encoding(s);
-        return;
-    }
+    TCGv_i64 discard = tcg_temp_new_i64();
+    TCGv_i64 tcg_rd = cpu_reg(s, a->rd);
+    TCGv_i64 tcg_rn = cpu_reg(s, a->rn);
+    TCGv_i64 tcg_rm = cpu_reg(s, a->rm);
 
-    if (is_high) {
-        TCGv_i64 low_bits = tcg_temp_new_i64(); /* low bits discarded */
-        TCGv_i64 tcg_rd = cpu_reg(s, rd);
-        TCGv_i64 tcg_rn = cpu_reg(s, rn);
-        TCGv_i64 tcg_rm = cpu_reg(s, rm);
+    fn(discard, tcg_rd, tcg_rn, tcg_rm);
+    return true;
+}
 
-        if (is_signed) {
-            tcg_gen_muls2_i64(low_bits, tcg_rd, tcg_rn, tcg_rm);
-        } else {
-            tcg_gen_mulu2_i64(low_bits, tcg_rd, tcg_rn, tcg_rm);
-        }
-        return;
-    }
+TRANS(SMULH, do_mulh, a, tcg_gen_muls2_i64)
+TRANS(UMULH, do_mulh, a, tcg_gen_mulu2_i64)
 
-    tcg_op1 = tcg_temp_new_i64();
-    tcg_op2 = tcg_temp_new_i64();
-    tcg_tmp = tcg_temp_new_i64();
+static bool do_muladd(DisasContext *s, arg_rrrr *a,
+                      bool sf, bool is_sub, MemOp mop)
+{
+    TCGv_i64 tcg_rd = cpu_reg(s, a->rd);
+    TCGv_i64 tcg_op1, tcg_op2;
 
-    if (op_id < 0x42) {
-        tcg_gen_mov_i64(tcg_op1, cpu_reg(s, rn));
-        tcg_gen_mov_i64(tcg_op2, cpu_reg(s, rm));
+    if (mop == MO_64) {
+        tcg_op1 = cpu_reg(s, a->rn);
+        tcg_op2 = cpu_reg(s, a->rm);
     } else {
-        if (is_signed) {
-            tcg_gen_ext32s_i64(tcg_op1, cpu_reg(s, rn));
-            tcg_gen_ext32s_i64(tcg_op2, cpu_reg(s, rm));
-        } else {
-            tcg_gen_ext32u_i64(tcg_op1, cpu_reg(s, rn));
-            tcg_gen_ext32u_i64(tcg_op2, cpu_reg(s, rm));
-        }
+        tcg_op1 = tcg_temp_new_i64();
+        tcg_op2 = tcg_temp_new_i64();
+        tcg_gen_ext_i64(tcg_op1, cpu_reg(s, a->rn), mop);
+        tcg_gen_ext_i64(tcg_op2, cpu_reg(s, a->rm), mop);
     }
 
-    if (ra == 31 && !is_sub) {
+    if (a->ra == 31 && !is_sub) {
         /* Special-case MADD with rA == XZR; it is the standard MUL alias */
-        tcg_gen_mul_i64(cpu_reg(s, rd), tcg_op1, tcg_op2);
+        tcg_gen_mul_i64(tcg_rd, tcg_op1, tcg_op2);
     } else {
+        TCGv_i64 tcg_tmp = tcg_temp_new_i64();
+        TCGv_i64 tcg_ra = cpu_reg(s, a->ra);
+
         tcg_gen_mul_i64(tcg_tmp, tcg_op1, tcg_op2);
         if (is_sub) {
-            tcg_gen_sub_i64(cpu_reg(s, rd), cpu_reg(s, ra), tcg_tmp);
+            tcg_gen_sub_i64(tcg_rd, tcg_ra, tcg_tmp);
         } else {
-            tcg_gen_add_i64(cpu_reg(s, rd), cpu_reg(s, ra), tcg_tmp);
+            tcg_gen_add_i64(tcg_rd, tcg_ra, tcg_tmp);
         }
     }
 
     if (!sf) {
-        tcg_gen_ext32u_i64(cpu_reg(s, rd), cpu_reg(s, rd));
+        tcg_gen_ext32u_i64(tcg_rd, tcg_rd);
     }
+    return true;
 }
 
+TRANS(MADD_w, do_muladd, a, false, false, MO_64)
+TRANS(MSUB_w, do_muladd, a, false, true, MO_64)
+TRANS(MADD_x, do_muladd, a, true, false, MO_64)
+TRANS(MSUB_x, do_muladd, a, true, true, MO_64)
+
+TRANS(SMADDL, do_muladd, a, true, false, MO_SL)
+TRANS(SMSUBL, do_muladd, a, true, true, MO_SL)
+TRANS(UMADDL, do_muladd, a, true, false, MO_UL)
+TRANS(UMSUBL, do_muladd, a, true, true, MO_UL)
+
 /* Add/subtract (with carry)
  *  31 30 29 28 27 26 25 24 23 22 21  20  16  15       10  9    5 4   0
  * +--+--+--+------------------------+------+-------------+------+-----+
@@ -8364,13 +8334,10 @@ static void disas_data_proc_reg(DisasContext *s, uint32_t insn)
         disas_cond_select(s, insn);
         break;
 
-    case 0x8 ... 0xf: /* (3 source) */
-        disas_data_proc_3src(s, insn);
-        break;
-
     default:
     do_unallocated:
     case 0x6: /* Data-processing */
+    case 0x8 ... 0xf: /* (3 source) */
         unallocated_encoding(s);
         break;
     }