Zicfilp: Support lpad instruction in disassembler

Author: mylai-mtk

disasm/disasm.cc

@@ -868,6 +868,12 @@ void disassembler_t::add_instructions(const isa_parser_t* isa)
     DEFINE_XAMO(amocas_h)
   }
 
+  if (isa->extension_enabled(EXT_ZICFILP)) {
+    // lpad encodes as `auipc x0, label`, so it needs to be added before auipc
+    // for higher disassembling priority
+    DISASM_INSN("lpad", lpad, 0, {&bigimm});
+  }
+
   add_insn(new disasm_insn_t("j", match_jal, mask_jal | mask_rd, {&jump_target}));
   add_insn(new disasm_insn_t("jal", match_jal | match_rd_ra, mask_jal | mask_rd, {&jump_target}));
   add_insn(new disasm_insn_t("jal", match_jal, mask_jal, {&xrd, &jump_target}));