diff --git a/target/hexagon/decode.c b/target/hexagon/decode.c
index a40210c..4595e30 100644
--- a/target/hexagon/decode.c
+++ b/target/hexagon/decode.c
@@ -131,6 +131,8 @@
                 use_regidx = strchr(opcode_reginfo[use_opcode], 's') -
                     opcode_reginfo[use_opcode];
             }
+            g_assert(packet->insn[i].new_read_idx != -1 &&
+                     packet->insn[i].new_read_idx == use_regidx);
 
             /*
              * What's encoded at the N-field is the offset to who's producing
diff --git a/target/hexagon/gen_trans_funcs.py b/target/hexagon/gen_trans_funcs.py
index 53e844a..8acecdb 100755
--- a/target/hexagon/gen_trans_funcs.py
+++ b/target/hexagon/gen_trans_funcs.py
@@ -68,6 +68,7 @@
 ##         insn->regno[0] = args->Rd;
 ##         insn->regno[1] = args->Rs;
 ##         insn->regno[2] = args->Rt;
+##         insn->new_read_idx = -1;
 ##         return true;
 ##     }
 ##
@@ -84,14 +85,14 @@
                 insn->opcode = {tag};
         """))
 
-        regno = 0
-        for reg in regs:
-            reg_type = reg[0]
-            reg_id = reg[1]
+        new_read_idx = -1
+        for regno, (reg_type, reg_id, *_) in enumerate(regs):
+            reg = hex_common.get_register(tag, reg_type, reg_id)
             f.write(code_fmt(f"""\
                 insn->regno[{regno}] = args->{reg_type}{reg_id};
             """))
-            regno += 1
+            if reg.is_read() and reg.is_new():
+                new_read_idx = regno
 
         if len(imms) != 0:
             mark_which_imm_extended(f, tag)
@@ -112,6 +113,9 @@
                     insn->immed[{immno}] = args->{imm_type}{imm_letter};
                 """))
 
+        f.write(code_fmt(f"""\
+            insn->new_read_idx = {new_read_idx};
+        """))
         f.write(textwrap.dedent(f"""\
                 return true;
             {close_curly}
@@ -120,5 +124,6 @@
 
 if __name__ == "__main__":
     hex_common.read_semantics_file(sys.argv[1])
+    hex_common.init_registers()
     with open(sys.argv[2], "w") as f:
         gen_trans_funcs(f)
diff --git a/target/hexagon/insn.h b/target/hexagon/insn.h
index 3e7a22c..36502bf 100644
--- a/target/hexagon/insn.h
+++ b/target/hexagon/insn.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright(c) 2019-2022 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *  Copyright(c) 2019-2024 Qualcomm Innovation Center, Inc. All Rights Reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -39,6 +39,7 @@
     uint32_t slot:3;
     uint32_t which_extended:1;    /* If has an extender, which immediate */
     uint32_t new_value_producer_slot:4;
+    int32_t new_read_idx;
 
     bool part1;              /*
                               * cmp-jumps are split into two insns.
diff --git a/target/hexagon/mmvec/decode_ext_mmvec.c b/target/hexagon/mmvec/decode_ext_mmvec.c
index 202d84c..e9007f5 100644
--- a/target/hexagon/mmvec/decode_ext_mmvec.c
+++ b/target/hexagon/mmvec/decode_ext_mmvec.c
@@ -41,6 +41,8 @@
             GET_ATTRIB(use_opcode, A_STORE)) {
             int use_regidx = strchr(opcode_reginfo[use_opcode], 's') -
                 opcode_reginfo[use_opcode];
+            g_assert(pkt->insn[i].new_read_idx != -1 &&
+                     pkt->insn[i].new_read_idx == use_regidx);
             /*
              * What's encoded at the N-field is the offset to who's producing
              * the value.