From: Taylor Simpson <ltaylorsimpson@gmail.com>

Check that the value matches opcode_wregs

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240307032327.4799-5-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
---
 target/hexagon/decode.c           | 3 +++
 target/hexagon/gen_trans_funcs.py | 5 +++++
 target/hexagon/insn.h             | 1 +
 3 files changed, 9 insertions(+)

diff --git a/target/hexagon/decode.c b/target/hexagon/decode.c
index a4d8500fea..84a3899556 100644
--- a/target/hexagon/decode.c
+++ b/target/hexagon/decode.c
@@ -366,6 +366,9 @@ static void decode_shuffle_for_execution(Packet *packet)
         for (flag = false, i = 0; i < last_insn + 1; i++) {
             int opcode = packet->insn[i].opcode;
 
+            g_assert(packet->insn[i].has_pred_dest ==
+                     (strstr(opcode_wregs[opcode], "Pd4") ||
+                      strstr(opcode_wregs[opcode], "Pe4")));
             if ((strstr(opcode_wregs[opcode], "Pd4") ||
                  strstr(opcode_wregs[opcode], "Pe4")) &&
                 GET_ATTRIB(opcode, A_STORE) == 0) {
diff --git a/target/hexagon/gen_trans_funcs.py b/target/hexagon/gen_trans_funcs.py
index 1201172dda..9f86b4edbd 100755
--- a/target/hexagon/gen_trans_funcs.py
+++ b/target/hexagon/gen_trans_funcs.py
@@ -70,6 +70,7 @@ def mark_which_imm_extended(f, tag):
 ##         insn->regno[2] = args->Rt;
 ##         insn->new_read_idx = -1;
 ##         insn->dest_idx = 0;
+##         insn->has_pred_dest = false;
 ##         return true;
 ##     }
 ##
@@ -88,6 +89,7 @@ def gen_trans_funcs(f):
 
         new_read_idx = -1
         dest_idx = -1
+        has_pred_dest = "false"
         for regno, (reg_type, reg_id, *_) in enumerate(regs):
             reg = hex_common.get_register(tag, reg_type, reg_id)
             f.write(code_fmt(f"""\
@@ -98,6 +100,8 @@ def gen_trans_funcs(f):
             # dest_idx should be the first destination, so check for -1
             if reg.is_written() and dest_idx == -1:
                 dest_idx = regno
+            if reg_type == "P" and reg.is_written() and not reg.is_read():
+                has_pred_dest = "true"
 
         if len(imms) != 0:
             mark_which_imm_extended(f, tag)
@@ -121,6 +125,7 @@ def gen_trans_funcs(f):
         f.write(code_fmt(f"""\
             insn->new_read_idx = {new_read_idx};
             insn->dest_idx = {dest_idx};
+            insn->has_pred_dest = {has_pred_dest};
         """))
         f.write(textwrap.dedent(f"""\
                 return true;
diff --git a/target/hexagon/insn.h b/target/hexagon/insn.h
index a770379958..24dcf7fe9f 100644
--- a/target/hexagon/insn.h
+++ b/target/hexagon/insn.h
@@ -41,6 +41,7 @@ struct Instruction {
     uint32_t new_value_producer_slot:4;
     int32_t new_read_idx;
     int32_t dest_idx;
+    bool has_pred_dest;
 
     bool part1;              /*
                               * cmp-jumps are split into two insns.
-- 
2.25.1