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

Convert DIVU.G (divide 32-bit unsigned integers) and DDIVU.G
(divide 64-bit unsigned integers) opcodes to decodetree.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20241026175349.84523-7-philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

diff --git a/target/mips/tcg/godson2.decode b/target/mips/tcg/godson2.decode
index cbf24ed88dac7d15d561471d12a5a1cc02ec8848..581cb9c8608498cc3d05fd3aff57019860c4f8e5 100644 (file)
--- a/target/mips/tcg/godson2.decode
+++ b/target/mips/tcg/godson2.decode
@@ -14,4 +14,6 @@
 @rs_rt_rd       ...... rs:5  rt:5  rd:5  ..... ......   &muldiv
 
 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

diff --git a/target/mips/tcg/loong-ext.decode b/target/mips/tcg/loong-ext.decode
index 9397606beb62e41a5915a12ef633ab8ea90bd89f..e222167af569367305b1eab576d3930614d64700 100644 (file)
--- a/target/mips/tcg/loong-ext.decode
+++ b/target/mips/tcg/loong-ext.decode
@@ -16,3 +16,5 @@
 
 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

diff --git a/target/mips/tcg/loong_translate.c b/target/mips/tcg/loong_translate.c
index cb42acbdca409604d86783083cf3eda47f7d807f..2484b8a68df75aa4ef3dd2cbb5d54a8fdbe1c799 100644 (file)
--- a/target/mips/tcg/loong_translate.c
+++ b/target/mips/tcg/loong_translate.c
@@ -87,6 +87,60 @@ static bool trans_DDIV_G(DisasContext *s, arg_muldiv *a)
     return gen_lext_DIV_G(s, a->rd, a->rs, a->rt, true);
 }
 
+static bool gen_lext_DIVU_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_divu_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_DIVU_G(DisasContext *s, arg_muldiv *a)
+{
+    return gen_lext_DIVU_G(s, a->rd, a->rs, a->rt, false);
+}
+
+static bool trans_DDIVU_G(DisasContext *s, arg_muldiv *a)
+{
+    return gen_lext_DIVU_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 1c38e893d311def970878ab4c82515f8c1f91710..53bbbb761f81ee211a1bbb1a969210049fdad290 100644 (file)
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -332,8 +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_DIVU_G_2F   = 0x16 | OPC_SPECIAL2,
-    OPC_DDIVU_G_2F  = 0x17 | OPC_SPECIAL2,
     OPC_MOD_G_2F    = 0x1c | OPC_SPECIAL2,
     OPC_DMOD_G_2F   = 0x1d | OPC_SPECIAL2,
     OPC_MODU_G_2F   = 0x1e | OPC_SPECIAL2,
@@ -369,10 +367,8 @@ enum {
     /* Loongson 2E */
     OPC_MULT_G_2E   = 0x18 | OPC_SPECIAL3,
     OPC_MULTU_G_2E  = 0x19 | OPC_SPECIAL3,
-    OPC_DIVU_G_2E   = 0x1B | OPC_SPECIAL3,
     OPC_DMULT_G_2E  = 0x1C | OPC_SPECIAL3,
     OPC_DMULTU_G_2E = 0x1D | OPC_SPECIAL3,
-    OPC_DDIVU_G_2E  = 0x1F | OPC_SPECIAL3,
     OPC_MOD_G_2E    = 0x22 | OPC_SPECIAL3,
     OPC_MODU_G_2E   = 0x23 | OPC_SPECIAL3,
     OPC_DMOD_G_2E   = 0x26 | OPC_SPECIAL3,
@@ -3611,22 +3607,6 @@ 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_DIVU_G_2E:
-    case OPC_DIVU_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_divu_tl(cpu_gpr[rd], t0, t1);
-            tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
-            gen_set_label(l2);
-        }
-        break;
     case OPC_MOD_G_2E:
     case OPC_MOD_G_2F:
         {
@@ -3672,19 +3652,6 @@ 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_DDIVU_G_2E:
-    case OPC_DDIVU_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_divu_tl(cpu_gpr[rd], t0, t1);
-            gen_set_label(l2);
-        }
-        break;
     case OPC_DMOD_G_2E:
     case OPC_DMOD_G_2F:
         {
@@ -13574,7 +13541,6 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
     case OPC_MUL:
         gen_arith(ctx, op1, rd, rs, rt);
         break;
-    case OPC_DIVU_G_2F:
     case OPC_MULT_G_2F:
     case OPC_MULTU_G_2F:
     case OPC_MOD_G_2F:
@@ -13608,7 +13574,6 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
         break;
     case OPC_DMULT_G_2F:
     case OPC_DMULTU_G_2F:
-    case OPC_DDIVU_G_2F:
     case OPC_DMOD_G_2F:
     case OPC_DMODU_G_2F:
         check_insn(ctx, INSN_LOONGSON2F | ASE_LEXT);
@@ -13746,7 +13711,6 @@ static void decode_opc_special3_legacy(CPUMIPSState *env, DisasContext *ctx)
 
     op1 = MASK_SPECIAL3(ctx->opcode);
     switch (op1) {
-    case OPC_DIVU_G_2E:
     case OPC_MOD_G_2E:
     case OPC_MODU_G_2E:
     case OPC_MULT_G_2E:
@@ -14013,7 +13977,6 @@ static void decode_opc_special3_legacy(CPUMIPSState *env, DisasContext *ctx)
         }
         break;
 #if defined(TARGET_MIPS64)
-    case OPC_DDIVU_G_2E:
     case OPC_DMULT_G_2E:
     case OPC_DMULTU_G_2E:
     case OPC_DMOD_G_2E: