[PATCH v3 08/32] target/mips: Convert MSA LDI opcode to decodetree

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Convert the LDI opcode (Immediate Load) to decodetree. Since it
overlaps with the generic MSA handler, use a decodetree overlap
group.

Since the 'data format' field is a constant value, use
tcg_constant_i32() instead of a TCG temporary.

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: <20211027180730.1551932-6-f4bug@amsat.org>
---
 target/mips/tcg/msa.decode      |  8 +++++++-
 target/mips/tcg/msa_translate.c | 22 ++++++++++++++--------
 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/target/mips/tcg/msa.decode b/target/mips/tcg/msa.decode
index 56419a24eb9..bdfe5a24cb3 100644
--- a/target/mips/tcg/msa.decode
+++ b/target/mips/tcg/msa.decode
@@ -14,10 +14,12 @@
 &r                  rs rt rd sa
 
 &msa_bz             df        wt sa
+&msa_ldi            df  wd       sa
 
 @lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &r
 @bz_v               ...... ... ..    wt:5 sa:16             &msa_bz df=3
 @bz                 ...... ...  df:2 wt:5 sa:16             &msa_bz
+@ldi                ...... ... df:2 sa:s10     wd:5 ......  &msa_ldi
 
 LSA                 000000 ..... ..... ..... 000 .. 000101  @lsa
 DLSA                000000 ..... ..... ..... 000 .. 010101  @lsa
@@ -27,4 +29,8 @@ BNZ_V               010001 01111  ..... ................    @bz_v
 BZ                  010001 110 .. ..... ................    @bz
 BNZ                 010001 111 .. ..... ................    @bz
 
-MSA                 011110 --------------------------
+{
+  LDI               011110 110 .. ..........  ..... 000111  @ldi
+
+  MSA               011110 --------------------------
+}
diff --git a/target/mips/tcg/msa_translate.c b/target/mips/tcg/msa_translate.c
index e1d90fbde25..ff78359597f 100644
--- a/target/mips/tcg/msa_translate.c
+++ b/target/mips/tcg/msa_translate.c
@@ -70,7 +70,6 @@ enum {
     OPC_CLEI_S_df   = (0x4 << 23) | OPC_MSA_I5_07,
     OPC_MINI_U_df   = (0x5 << 23) | OPC_MSA_I5_06,
     OPC_CLEI_U_df   = (0x5 << 23) | OPC_MSA_I5_07,
-    OPC_LDI_df      = (0x6 << 23) | OPC_MSA_I5_07,
 
     /* I8 instruction */
     OPC_ANDI_B      = (0x0 << 24) | OPC_MSA_I8_00,
@@ -513,13 +512,6 @@ static void gen_msa_i5(DisasContext *ctx)
     case OPC_CLEI_U_df:
         gen_helper_msa_clei_u_df(cpu_env, tdf, twd, tws, timm);
         break;
-    case OPC_LDI_df:
-        {
-            int32_t s10 = sextract32(ctx->opcode, 11, 10);
-            tcg_gen_movi_i32(timm, s10);
-            gen_helper_msa_ldi_df(cpu_env, tdf, twd, timm);
-        }
-        break;
     default:
         MIPS_INVAL("MSA instruction");
         gen_reserved_instruction(ctx);
@@ -532,6 +524,20 @@ static void gen_msa_i5(DisasContext *ctx)
     tcg_temp_free_i32(timm);
 }
 
+static bool trans_LDI(DisasContext *ctx, arg_msa_ldi *a)
+{
+    if (!check_msa_enabled(ctx)) {
+        return true;
+    }
+
+    gen_helper_msa_ldi_df(cpu_env,
+                          tcg_constant_i32(a->df),
+                          tcg_constant_i32(a->wd),
+                          tcg_constant_i32(a->sa));
+
+    return true;
+}
+
 static void gen_msa_bit(DisasContext *ctx)
 {
 #define MASK_MSA_BIT(op)    (MASK_MSA_MINOR(op) | (op & (0x7 << 23)))
-- 
2.31.1