Hexagon (target/hexagon) Use QEMU decodetree (16-bit instructions)

Section 10.3 of the Hexagon V73 Programmer's Reference Manual

A duplex is encoded as a 32-bit instruction with bits [15:14] set to 00.
The sub-instructions that comprise a duplex are encoded as 13-bit fields
in the duplex.

Create a decoder for each subinstruction class (a, l1, l2, s1, s2).

Extend gen_trans_funcs.py to handle all instructions rather than
filter by instruction class.

There is a g_assert_not_reached() in decode_insns() in decode.c to
verify we never try to use the old decoder on 16-bit instructions.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240115221443.365287-3-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>

1 files changed, 2 insertions, 10 deletions

diff --git a/target/hexagon/gen_trans_funcs.py b/target/hexagon/gen_trans_funcs.py
index c907131009..53e844a44b 100755
--- a/target/hexagon/gen_trans_funcs.py
+++ b/target/hexagon/gen_trans_funcs.py
@@ -40,11 +40,6 @@ def ordered_unique(l):
     return sorted(set(l), key=l.index)
 
 
-def skip_tag(tag, classes):
-    enc_class = iset.iset[tag]["enc_class"]
-    return enc_class not in classes
-
-
 def code_fmt(txt):
     return textwrap.indent(textwrap.dedent(txt), "    ")
 
@@ -76,12 +71,9 @@ def mark_which_imm_extended(f, tag):
 ##         return true;
 ##     }
 ##
-def gen_trans_funcs(f, classes):
+def gen_trans_funcs(f):
     f.write(f"/* DO NOT MODIFY - This file is generated by {sys.argv[0]} */\n\n")
     for tag in sorted(encs.keys(), key=iset.tags.index):
-        if skip_tag(tag, classes):
-            continue
-
         regs = ordered_unique(regre.findall(iset.iset[tag]["syntax"]))
         imms = ordered_unique(immre.findall(iset.iset[tag]["syntax"]))
 
@@ -129,4 +121,4 @@ def gen_trans_funcs(f, classes):
 if __name__ == "__main__":
     hex_common.read_semantics_file(sys.argv[1])
     with open(sys.argv[2], "w") as f:
-        gen_trans_funcs(f, { "NORMAL", "EXT_mmvec" })
+        gen_trans_funcs(f)