[PATCH v3 16/32] target/mips: Convert MSA 2R instruction format to decodetree

[Philippe Mathieu-Daudé]

Convert 2-register operations to decodetree.

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20211027180730.1551932-17-f4bug@amsat.org>
---
v3:
- Call check_msa_enabled in trans_X()
---
 target/mips/tcg/msa.decode      |  3 ++
 target/mips/tcg/msa_translate.c | 89 ++++++---------------------------
 2 files changed, 18 insertions(+), 74 deletions(-)

diff --git a/target/mips/tcg/msa.decode b/target/mips/tcg/msa.decode
index bcbc573deec..b6ac80560f6 100644
--- a/target/mips/tcg/msa.decode
+++ b/target/mips/tcg/msa.decode
@@ -84,6 +84,9 @@ BNZ                 010001 111 .. ..... ................    
@bz
   SRLRI             011110 011 ....... ..... .....  001010  @bit
 
   FILL              011110 11000000 .. ..... .....  011110  @2r
+  PCNT              011110 11000001 .. ..... .....  011110  @2r
+  NLOC              011110 11000010 .. ..... .....  011110  @2r
+  NLZC              011110 11000011 .. ..... .....  011110  @2r
   FCLASS            011110 110010000 . ..... .....  011110  @2rf
   FTRUNC_S          011110 110010001 . ..... .....  011110  @2rf
   FTRUNC_U          011110 110010010 . ..... .....  011110  @2rf
diff --git a/target/mips/tcg/msa_translate.c b/target/mips/tcg/msa_translate.c
index 1894d779196..f0077f7e54c 100644
--- a/target/mips/tcg/msa_translate.c
+++ b/target/mips/tcg/msa_translate.c
@@ -58,13 +58,6 @@ enum {
     OPC_BMZ_V       = (0x05 << 21) | OPC_MSA_VEC,
     OPC_BSEL_V      = (0x06 << 21) | OPC_MSA_VEC,
 
-    OPC_MSA_2R      = (0x18 << 21) | OPC_MSA_VEC,
-
-    /* 2R instruction df(bits 17..16) = _b, _h, _w, _d */
-    OPC_PCNT_df     = (0x01 << 18) | OPC_MSA_2R,
-    OPC_NLOC_df     = (0x02 << 18) | OPC_MSA_2R,
-    OPC_NLZC_df     = (0x03 << 18) | OPC_MSA_2R,
-
     /* 3R instruction df(bits 22..21) = _b, _h, _w, d */
     OPC_SLL_df      = (0x0 << 23) | OPC_MSA_3R_0D,
     OPC_ADDV_df     = (0x0 << 23) | OPC_MSA_3R_0E,
@@ -298,6 +291,7 @@ static inline bool check_msa_enabled(DisasContext *ctx)
 }
 
 typedef void gen_helper_piv(TCGv_ptr, TCGv_i32, TCGv);
+typedef void gen_helper_pii(TCGv_ptr, TCGv_i32, TCGv_i32);
 typedef void gen_helper_piii(TCGv_ptr, TCGv_i32, TCGv_i32, TCGv_i32);
 typedef void gen_helper_piiii(TCGv_ptr, TCGv_i32, TCGv_i32, TCGv_i32, 
TCGv_i32);
 
@@ -310,6 +304,9 @@ typedef void gen_helper_piiii(TCGv_ptr, TCGv_i32, TCGv_i32, 
TCGv_i32, TCGv_i32);
 #define TRANS_DF_iv(NAME, trans_func, gen_func) \
     TRANS_DF_x(iv, NAME, trans_func, gen_func)
 
+#define TRANS_DF_ii(NAME, trans_func, gen_func) \
+    TRANS_DF_x(ii, NAME, trans_func, gen_func)
+
 static void gen_check_zero_element(TCGv tresult, uint8_t df, uint8_t wt,
                                    TCGCond cond)
 {
@@ -1833,75 +1830,22 @@ static void gen_msa_3rf(DisasContext *ctx)
     tcg_temp_free_i32(twt);
 }
 
-static void gen_msa_2r(DisasContext *ctx)
+static bool trans_msa_2r(DisasContext *ctx, arg_msa_r *a,
+                         gen_helper_pii *gen_msa_2r)
 {
-#define MASK_MSA_2R(op)     (MASK_MSA_MINOR(op) | (op & (0x1f << 21)) | \
-                            (op & (0x7 << 18)))
-    uint8_t ws = (ctx->opcode >> 11) & 0x1f;
-    uint8_t wd = (ctx->opcode >> 6) & 0x1f;
-    uint8_t df = (ctx->opcode >> 16) & 0x3;
-    TCGv_i32 twd = tcg_const_i32(wd);
-    TCGv_i32 tws = tcg_const_i32(ws);
-
-    switch (MASK_MSA_2R(ctx->opcode)) {
-    case OPC_NLOC_df:
-        switch (df) {
-        case DF_BYTE:
-            gen_helper_msa_nloc_b(cpu_env, twd, tws);
-            break;
-        case DF_HALF:
-            gen_helper_msa_nloc_h(cpu_env, twd, tws);
-            break;
-        case DF_WORD:
-            gen_helper_msa_nloc_w(cpu_env, twd, tws);
-            break;
-        case DF_DOUBLE:
-            gen_helper_msa_nloc_d(cpu_env, twd, tws);
-            break;
-        }
-        break;
-    case OPC_NLZC_df:
-        switch (df) {
-        case DF_BYTE:
-            gen_helper_msa_nlzc_b(cpu_env, twd, tws);
-            break;
-        case DF_HALF:
-            gen_helper_msa_nlzc_h(cpu_env, twd, tws);
-            break;
-        case DF_WORD:
-            gen_helper_msa_nlzc_w(cpu_env, twd, tws);
-            break;
-        case DF_DOUBLE:
-            gen_helper_msa_nlzc_d(cpu_env, twd, tws);
-            break;
-        }
-        break;
-    case OPC_PCNT_df:
-        switch (df) {
-        case DF_BYTE:
-            gen_helper_msa_pcnt_b(cpu_env, twd, tws);
-            break;
-        case DF_HALF:
-            gen_helper_msa_pcnt_h(cpu_env, twd, tws);
-            break;
-        case DF_WORD:
-            gen_helper_msa_pcnt_w(cpu_env, twd, tws);
-            break;
-        case DF_DOUBLE:
-            gen_helper_msa_pcnt_d(cpu_env, twd, tws);
-            break;
-        }
-        break;
-    default:
-        MIPS_INVAL("MSA instruction");
-        gen_reserved_instruction(ctx);
-        break;
+    if (!check_msa_enabled(ctx)) {
+        return true;
     }
 
-    tcg_temp_free_i32(twd);
-    tcg_temp_free_i32(tws);
+    gen_msa_2r(cpu_env, tcg_constant_i32(a->wd), tcg_constant_i32(a->ws));
+
+    return true;
 }
 
+TRANS_DF_ii(PCNT, trans_msa_2r, gen_helper_msa_pcnt);
+TRANS_DF_ii(NLOC, trans_msa_2r, gen_helper_msa_nloc);
+TRANS_DF_ii(NLZC, trans_msa_2r, gen_helper_msa_nlzc);
+
 static bool trans_FILL(DisasContext *ctx, arg_msa_r *a)
 {
     if (TARGET_LONG_BITS != 64 && a->df == DF_DOUBLE) {
@@ -2008,9 +1952,6 @@ static void gen_msa_vec(DisasContext *ctx)
     case OPC_BSEL_V:
         gen_msa_vec_v(ctx);
         break;
-    case OPC_MSA_2R:
-        gen_msa_2r(ctx);
-        break;
     default:
         MIPS_INVAL("MSA instruction");
         gen_reserved_instruction(ctx);
-- 
2.31.1