diff --git a/target/mips/tcg/meson.build b/target/mips/tcg/meson.build
index bf4001e574..70fa3dd57d 100644
--- a/target/mips/tcg/meson.build
+++ b/target/mips/tcg/meson.build
@@ -1,6 +1,5 @@
 gen = [
-  decodetree.process('mips32r6.decode', extra_args: '--static-decode=decode_mips32r6'),
-  decodetree.process('mips64r6.decode', extra_args: '--static-decode=decode_mips64r6'),
+  decodetree.process('rel6.decode', extra_args: ['--decode=decode_isa_rel6']),
   decodetree.process('msa.decode', extra_args: '--decode=decode_ase_msa'),
   decodetree.process('tx79.decode', extra_args: '--static-decode=decode_tx79'),
 ]
diff --git a/target/mips/tcg/mips64r6.decode b/target/mips/tcg/mips64r6.decode
deleted file mode 100644
index b58d8009cc..0000000000
--- a/target/mips/tcg/mips64r6.decode
+++ /dev/null
@@ -1,27 +0,0 @@
-# MIPS64 Release 6 instruction set
-#
-# Copyright (C) 2020  Philippe Mathieu-Daudé
-#
-# SPDX-License-Identifier: LGPL-2.1-or-later
-#
-# Reference:
-#       MIPS Architecture for Programmers Volume II-A
-#       The MIPS64 Instruction Set Reference Manual, Revision 6.06
-#       (Document Number: MD00087-2B-MIPS64BIS-AFP-6.06)
-#
-
-&rtype              rs rt rd sa !extern
-
-&REMOVED            !extern
-
-@lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &rtype
-
-DLSA                000000 ..... ..... ..... 000 .. 010101  @lsa
-
-REMOVED             011010 ----- ----- ----------------     # LDL
-REMOVED             011011 ----- ----- ----------------     # LDR
-REMOVED             101100 ----- ----- ----------------     # SDL
-REMOVED             101101 ----- ----- ----------------     # SDR
-
-REMOVED             110100 ----- ----- ----------------     # LLD
-REMOVED             111100 ----- ----- ----------------     # SCD
diff --git a/target/mips/tcg/mips32r6.decode b/target/mips/tcg/rel6.decode
similarity index 69%
rename from target/mips/tcg/mips32r6.decode
rename to target/mips/tcg/rel6.decode
index 837c991edc..ed069c5166 100644
--- a/target/mips/tcg/mips32r6.decode
+++ b/target/mips/tcg/rel6.decode
@@ -5,21 +5,29 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 #
 # Reference:
+#
 #       MIPS Architecture for Programmers Volume II-A
 #       The MIPS32 Instruction Set Reference Manual, Revision 6.06
 #       (Document Number: MD00086-2B-MIPS32BIS-AFP-06.06)
 #
+#       MIPS Architecture for Programmers Volume II-A
+#       The MIPS64 Instruction Set Reference Manual, Revision 6.06
+#       (Document Number: MD00087-2B-MIPS64BIS-AFP-6.06)
 
 &rtype              rs rt rd sa
 
 @lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &rtype
 
 LSA                 000000 ..... ..... ..... 000 .. 000101  @lsa
+DLSA                000000 ..... ..... ..... 000 .. 010101  @lsa
 
 REMOVED             010011 ----- ----- ----- ----- ------   # COP1X (COP3)
 
 REMOVED             011100 ----- ----- ----- ----- ------   # SPECIAL2
 
+REMOVED             011010 ----- ----- ----------------     # LDL
+REMOVED             011011 ----- ----- ----------------     # LDR
+
 REMOVED             011111 ----- ----- ----------  011001   # LWLE
 REMOVED             011111 ----- ----- ----------  011010   # LWRE
 REMOVED             011111 ----- ----- ----------  100001   # SWLE
@@ -28,9 +36,14 @@ REMOVED             011111 ----- ----- ----------  100010   # SWRE
 REMOVED             100010 ----- ----- ----------------     # LWL
 REMOVED             100110 ----- ----- ----------------     # LWR
 REMOVED             101010 ----- ----- ----------------     # SWL
+REMOVED             101100 ----- ----- ----------------     # SDL
+REMOVED             101101 ----- ----- ----------------     # SDR
 REMOVED             101110 ----- ----- ----------------     # SWR
 
 REMOVED             101111 ----- ----- ----------------     # CACHE
+
 REMOVED             110000 ----- ----- ----------------     # LL
 REMOVED             110011 ----- ----- ----------------     # PREF
+REMOVED             110100 ----- ----- ----------------     # LLD
 REMOVED             111000 ----- ----- ----------------     # SC
+REMOVED             111100 ----- ----- ----------------     # SCD
diff --git a/target/mips/tcg/rel6_translate.c b/target/mips/tcg/rel6_translate.c
index 0354370927..ae2e023a81 100644
--- a/target/mips/tcg/rel6_translate.c
+++ b/target/mips/tcg/rel6_translate.c
@@ -13,9 +13,8 @@
 #include "exec/helper-gen.h"
 #include "translate.h"
 
-/* Include the auto-generated decoder.  */
-#include "decode-mips32r6.c.inc"
-#include "decode-mips64r6.c.inc"
+/* Include the auto-generated decoders.  */
+#include "decode-rel6.c.inc"
 
 bool trans_REMOVED(DisasContext *ctx, arg_REMOVED *a)
 {
@@ -31,13 +30,8 @@ static bool trans_LSA(DisasContext *ctx, arg_rtype *a)
 
 static bool trans_DLSA(DisasContext *ctx, arg_rtype *a)
 {
+    if (TARGET_LONG_BITS != 64) {
+        return false;
+    }
     return gen_dlsa(ctx, a->rd, a->rt, a->rs, a->sa);
 }
-
-bool decode_isa_rel6(DisasContext *ctx, uint32_t insn)
-{
-    if (TARGET_LONG_BITS == 64 && decode_mips64r6(ctx, insn)) {
-        return true;
-    }
-    return decode_mips32r6(ctx, insn);
-}