target/mips: Convert Loongson [D]MOD[U].G opcodes to decodetree

Convert the following opcodes to decodetree:

- MOD.G - mod 32-bit signed integers
- MODU.G - mod 32-bit unsigned integers
- DMOD.G - mod 64-bit signed integers
- DMODU.G - mod 64-bit unsigned integers

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20241026175349.84523-8-philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

4 files changed, 121 insertions, 82 deletions

diff --git a/target/mips/tcg/godson2.decode b/target/mips/tcg/godson2.decode
index 581cb9c860..c03c8b717d 100644
--- a/target/mips/tcg/godson2.decode
+++ b/target/mips/tcg/godson2.decode
@@ -17,3 +17,8 @@ DIV_G           011111 ..... ..... ..... 00000 011010   @rs_rt_rd
 DIVU_G          011111 ..... ..... ..... 00000 011011   @rs_rt_rd
 DDIV_G          011111 ..... ..... ..... 00000 011110   @rs_rt_rd
 DDIVU_G         011111 ..... ..... ..... 00000 011111   @rs_rt_rd
+
+MOD_G           011111 ..... ..... ..... 00000 100010   @rs_rt_rd
+MODU_G          011111 ..... ..... ..... 00000 100011   @rs_rt_rd
+DMOD_G          011111 ..... ..... ..... 00000 100110   @rs_rt_rd
+DMODU_G         011111 ..... ..... ..... 00000 100111   @rs_rt_rd
diff --git a/target/mips/tcg/loong-ext.decode b/target/mips/tcg/loong-ext.decode
index e222167af5..f0fd36c921 100644
--- a/target/mips/tcg/loong-ext.decode
+++ b/target/mips/tcg/loong-ext.decode
@@ -18,3 +18,8 @@ DIV_G           011100 ..... ..... ..... 00000 010100   @rs_rt_rd
 DDIV_G          011100 ..... ..... ..... 00000 010101   @rs_rt_rd
 DIVU_G          011100 ..... ..... ..... 00000 010110   @rs_rt_rd
 DDIVU_G         011100 ..... ..... ..... 00000 010111   @rs_rt_rd
+
+MOD_G           011100 ..... ..... ..... 00000 011100   @rs_rt_rd
+DMOD_G          011100 ..... ..... ..... 00000 011101   @rs_rt_rd
+MODU_G          011100 ..... ..... ..... 00000 011110   @rs_rt_rd
+DMODU_G         011100 ..... ..... ..... 00000 011111   @rs_rt_rd
diff --git a/target/mips/tcg/loong_translate.c b/target/mips/tcg/loong_translate.c
index 2484b8a68d..39afed7d5f 100644
--- a/target/mips/tcg/loong_translate.c
+++ b/target/mips/tcg/loong_translate.c
@@ -141,6 +141,117 @@ static bool trans_DDIVU_G(DisasContext *s, arg_muldiv *a)
     return gen_lext_DIVU_G(s, a->rd, a->rs, a->rt, true);
 }
 
+static bool gen_lext_MOD_G(DisasContext *s, int rd, int rs, int rt,
+                           bool is_double)
+{
+    TCGv t0, t1;
+    TCGLabel *l1, *l2, *l3;
+
+    if (is_double) {
+        if (TARGET_LONG_BITS != 64) {
+            return false;
+        }
+        check_mips_64(s);
+    }
+
+    if (rd == 0) {
+        /* Treat as NOP. */
+        return true;
+    }
+
+    t0 = tcg_temp_new();
+    t1 = tcg_temp_new();
+    l1 = gen_new_label();
+    l2 = gen_new_label();
+    l3 = gen_new_label();
+
+    gen_load_gpr(t0, rs);
+    gen_load_gpr(t1, rt);
+
+    if (!is_double) {
+        tcg_gen_ext32u_tl(t0, t0);
+        tcg_gen_ext32u_tl(t1, t1);
+    }
+    tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, l1);
+    tcg_gen_brcondi_tl(TCG_COND_NE, t0, is_double && TARGET_LONG_BITS == 64
+                                        ? LLONG_MIN : INT_MIN, l2);
+    tcg_gen_brcondi_tl(TCG_COND_NE, t1, -1LL, l2);
+    gen_set_label(l1);
+    tcg_gen_movi_tl(cpu_gpr[rd], 0);
+    tcg_gen_br(l3);
+    gen_set_label(l2);
+    tcg_gen_rem_tl(cpu_gpr[rd], t0, t1);
+    if (!is_double) {
+        tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
+    }
+    gen_set_label(l3);
+
+    return true;
+}
+
+static bool trans_MOD_G(DisasContext *s, arg_muldiv *a)
+{
+    return gen_lext_MOD_G(s, a->rd, a->rs, a->rt, false);
+}
+
+static bool trans_DMOD_G(DisasContext *s, arg_muldiv *a)
+{
+    return gen_lext_MOD_G(s, a->rd, a->rs, a->rt, true);
+}
+
+static bool gen_lext_MODU_G(DisasContext *s, int rd, int rs, int rt,
+                            bool is_double)
+{
+    TCGv t0, t1;
+    TCGLabel *l1, *l2;
+
+    if (is_double) {
+        if (TARGET_LONG_BITS != 64) {
+            return false;
+        }
+        check_mips_64(s);
+    }
+
+    if (rd == 0) {
+        /* Treat as NOP. */
+        return true;
+    }
+
+    t0 = tcg_temp_new();
+    t1 = tcg_temp_new();
+    l1 = gen_new_label();
+    l2 = gen_new_label();
+
+    gen_load_gpr(t0, rs);
+    gen_load_gpr(t1, rt);
+
+    if (!is_double) {
+        tcg_gen_ext32u_tl(t0, t0);
+        tcg_gen_ext32u_tl(t1, t1);
+    }
+    tcg_gen_brcondi_tl(TCG_COND_NE, t1, 0, l1);
+    tcg_gen_movi_tl(cpu_gpr[rd], 0);
+    tcg_gen_br(l2);
+    gen_set_label(l1);
+    tcg_gen_remu_tl(cpu_gpr[rd], t0, t1);
+    if (!is_double) {
+        tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
+    }
+    gen_set_label(l2);
+
+    return true;
+}
+
+static bool trans_MODU_G(DisasContext *s, arg_muldiv *a)
+{
+    return gen_lext_MODU_G(s, a->rd, a->rs, a->rt, false);
+}
+
+static bool trans_DMODU_G(DisasContext *s, arg_muldiv *a)
+{
+    return gen_lext_MODU_G(s, a->rd, a->rs, a->rt, true);
+}
+
 bool decode_ext_loongson(DisasContext *ctx, uint32_t insn)
 {
     if (!decode_64bit_enabled(ctx)) {
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 53bbbb761f..4abc30a6a5 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -332,10 +332,6 @@ enum {
     OPC_DMULT_G_2F  = 0x11 | OPC_SPECIAL2,
     OPC_MULTU_G_2F  = 0x12 | OPC_SPECIAL2,
     OPC_DMULTU_G_2F = 0x13 | OPC_SPECIAL2,
-    OPC_MOD_G_2F    = 0x1c | OPC_SPECIAL2,
-    OPC_DMOD_G_2F   = 0x1d | OPC_SPECIAL2,
-    OPC_MODU_G_2F   = 0x1e | OPC_SPECIAL2,
-    OPC_DMODU_G_2F  = 0x1f | OPC_SPECIAL2,
     /* Misc */
     OPC_CLZ      = 0x20 | OPC_SPECIAL2,
     OPC_CLO      = 0x21 | OPC_SPECIAL2,
@@ -369,10 +365,6 @@ enum {
     OPC_MULTU_G_2E  = 0x19 | OPC_SPECIAL3,
     OPC_DMULT_G_2E  = 0x1C | OPC_SPECIAL3,
     OPC_DMULTU_G_2E = 0x1D | OPC_SPECIAL3,
-    OPC_MOD_G_2E    = 0x22 | OPC_SPECIAL3,
-    OPC_MODU_G_2E   = 0x23 | OPC_SPECIAL3,
-    OPC_DMOD_G_2E   = 0x26 | OPC_SPECIAL3,
-    OPC_DMODU_G_2E  = 0x27 | OPC_SPECIAL3,
 
     /* MIPS DSP Load */
     OPC_LX_DSP         = 0x0A | OPC_SPECIAL3,
@@ -3607,42 +3599,6 @@ static void gen_loongson_integer(DisasContext *ctx, uint32_t opc,
         tcg_gen_mul_tl(cpu_gpr[rd], t0, t1);
         tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
         break;
-    case OPC_MOD_G_2E:
-    case OPC_MOD_G_2F:
-        {
-            TCGLabel *l1 = gen_new_label();
-            TCGLabel *l2 = gen_new_label();
-            TCGLabel *l3 = gen_new_label();
-            tcg_gen_ext32u_tl(t0, t0);
-            tcg_gen_ext32u_tl(t1, t1);
-            tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, l1);
-            tcg_gen_brcondi_tl(TCG_COND_NE, t0, INT_MIN, l2);
-            tcg_gen_brcondi_tl(TCG_COND_NE, t1, -1, l2);
-            gen_set_label(l1);
-            tcg_gen_movi_tl(cpu_gpr[rd], 0);
-            tcg_gen_br(l3);
-            gen_set_label(l2);
-            tcg_gen_rem_tl(cpu_gpr[rd], t0, t1);
-            tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
-            gen_set_label(l3);
-        }
-        break;
-    case OPC_MODU_G_2E:
-    case OPC_MODU_G_2F:
-        {
-            TCGLabel *l1 = gen_new_label();
-            TCGLabel *l2 = gen_new_label();
-            tcg_gen_ext32u_tl(t0, t0);
-            tcg_gen_ext32u_tl(t1, t1);
-            tcg_gen_brcondi_tl(TCG_COND_NE, t1, 0, l1);
-            tcg_gen_movi_tl(cpu_gpr[rd], 0);
-            tcg_gen_br(l2);
-            gen_set_label(l1);
-            tcg_gen_remu_tl(cpu_gpr[rd], t0, t1);
-            tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
-            gen_set_label(l2);
-        }
-        break;
 #if defined(TARGET_MIPS64)
     case OPC_DMULT_G_2E:
     case OPC_DMULT_G_2F:
@@ -3652,36 +3608,6 @@ static void gen_loongson_integer(DisasContext *ctx, uint32_t opc,
     case OPC_DMULTU_G_2F:
         tcg_gen_mul_tl(cpu_gpr[rd], t0, t1);
         break;
-    case OPC_DMOD_G_2E:
-    case OPC_DMOD_G_2F:
-        {
-            TCGLabel *l1 = gen_new_label();
-            TCGLabel *l2 = gen_new_label();
-            TCGLabel *l3 = gen_new_label();
-            tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, l1);
-            tcg_gen_brcondi_tl(TCG_COND_NE, t0, -1LL << 63, l2);
-            tcg_gen_brcondi_tl(TCG_COND_NE, t1, -1LL, l2);
-            gen_set_label(l1);
-            tcg_gen_movi_tl(cpu_gpr[rd], 0);
-            tcg_gen_br(l3);
-            gen_set_label(l2);
-            tcg_gen_rem_tl(cpu_gpr[rd], t0, t1);
-            gen_set_label(l3);
-        }
-        break;
-    case OPC_DMODU_G_2E:
-    case OPC_DMODU_G_2F:
-        {
-            TCGLabel *l1 = gen_new_label();
-            TCGLabel *l2 = gen_new_label();
-            tcg_gen_brcondi_tl(TCG_COND_NE, t1, 0, l1);
-            tcg_gen_movi_tl(cpu_gpr[rd], 0);
-            tcg_gen_br(l2);
-            gen_set_label(l1);
-            tcg_gen_remu_tl(cpu_gpr[rd], t0, t1);
-            gen_set_label(l2);
-        }
-        break;
 #endif
     }
 }
@@ -13543,8 +13469,6 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
         break;
     case OPC_MULT_G_2F:
     case OPC_MULTU_G_2F:
-    case OPC_MOD_G_2F:
-    case OPC_MODU_G_2F:
         check_insn(ctx, INSN_LOONGSON2F | ASE_LEXT);
         gen_loongson_integer(ctx, op1, rd, rs, rt);
         break;
@@ -13574,8 +13498,6 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
         break;
     case OPC_DMULT_G_2F:
     case OPC_DMULTU_G_2F:
-    case OPC_DMOD_G_2F:
-    case OPC_DMODU_G_2F:
         check_insn(ctx, INSN_LOONGSON2F | ASE_LEXT);
         gen_loongson_integer(ctx, op1, rd, rs, rt);
         break;
@@ -13711,8 +13633,6 @@ static void decode_opc_special3_legacy(CPUMIPSState *env, DisasContext *ctx)
 
     op1 = MASK_SPECIAL3(ctx->opcode);
     switch (op1) {
-    case OPC_MOD_G_2E:
-    case OPC_MODU_G_2E:
     case OPC_MULT_G_2E:
     case OPC_MULTU_G_2E:
         /*
@@ -13979,8 +13899,6 @@ static void decode_opc_special3_legacy(CPUMIPSState *env, DisasContext *ctx)
 #if defined(TARGET_MIPS64)
     case OPC_DMULT_G_2E:
     case OPC_DMULTU_G_2E:
-    case OPC_DMOD_G_2E:
-    case OPC_DMODU_G_2E:
         check_insn(ctx, INSN_LOONGSON2E);
         gen_loongson_integer(ctx, op1, rd, rs, rt);
         break;