target/mips: Introduce decodetree helpers for MSA LSA/DLSA opcodes

Add the LSA opcode to the MSA32 decodetree config, add DLSA
to a new config for the MSA64 ASE, and call decode_msa64()
in the main decode_opc() loop.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201215225757.764263-23-f4bug@amsat.org>

target/mips/meson.build

@@ -1,5 +1,6 @@
 gen = [
   decodetree.process('msa32.decode', extra_args: '--static-decode=decode_msa32'),
+  decodetree.process('msa64.decode', extra_args: '--static-decode=decode_msa64'),
 ]
 
 mips_ss = ss.source_set()

target/mips/msa32.decode

@@ -10,11 +10,16 @@
 #       (Document Number: MD00866-2B-MSA32-AFP-01.12)
 #
 
+&rtype              rs rt rd sa
+
 &msa_bz             df wt s16
 
+@lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &rtype
 @bz                 ...... ... ..   wt:5 s16:16             &msa_bz df=3
 @bz_df              ...... ... df:2 wt:5 s16:16             &msa_bz
 
+LSA                 000000 ..... ..... ..... 000 .. 000101  @lsa
+
 BZ_V                010001 01011  ..... ................    @bz
 BNZ_V               010001 01111  ..... ................    @bz
 

target/mips/msa64.decode

@@ -0,0 +1,17 @@
+# MIPS SIMD Architecture Module instruction set
+#
+# Copyright (C) 2020  Philippe Mathieu-Daudé
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Reference:
+#       MIPS Architecture for Programmers Volume IV-j
+#       The MIPS64 SIMD Architecture Module, Revision 1.12
+#       (Document Number: MD00868-1D-MSA64-AFP-01.12)
+#
+
+&rtype              rs rt rd sa !extern
+
+@lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &rtype
+
+DLSA                 000000 ..... ..... ..... 000 .. 010101 @lsa

target/mips/msa_translate.c

@@ -19,6 +19,7 @@
 
 /* Include the auto-generated decoder.  */
 #include "decode-msa32.c.inc"
+#include "decode-msa64.c.inc"
 
 #define OPC_MSA (0x1E << 26)
 
@@ -2266,7 +2267,20 @@ static bool trans_MSA(DisasContext *ctx, arg_MSA *a)
     return true;
 }
 
+static bool trans_LSA(DisasContext *ctx, arg_rtype *a)
+{
+    return gen_lsa(ctx, a->rd, a->rt, a->rs, a->sa);
+}
+
+static bool trans_DLSA(DisasContext *ctx, arg_rtype *a)
+{
+    return gen_dlsa(ctx, a->rd, a->rt, a->rs, a->sa);
+}
+
 bool decode_ase_msa(DisasContext *ctx, uint32_t insn)
 {
+    if (TARGET_LONG_BITS == 64 && decode_msa64(ctx, insn)) {
+        return true;
+    }
     return decode_msa32(ctx, insn);
 }