[llvm] [TableGen][DecoderEmitter] Print the size of the decoder tables (PR #155139)

[Sergei Barannikov via llvm-commits]

https://github.com/s-barannikov created https://github.com/llvm/llvm-project/pull/155139

So we can see the changes in table sizes after making changes to DecoderEmitter by simply running `grep DecoderTable`.

Also, remove an unnecessary terminating 0 from the end of the tables.

>From 7d7c89e0455277ecd958a53d2d3d8137612e318f Mon Sep 17 00:00:00 2001
From: Sergei Barannikov <barannikov88 at gmail.com>
Date: Sun, 24 Aug 2025 07:08:16 +0300
Subject: [PATCH] [TableGen][DecoderEmitter] Print the size of the decoder
 tables

So we can see the changes in table sizes after making changes to
DecoderEmitter by simply running `grep DecoderTable`.

Also, remove an unnecessary terminating 0 from the end of the tables.
---
 llvm/utils/TableGen/DecoderEmitter.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/llvm/utils/TableGen/DecoderEmitter.cpp b/llvm/utils/TableGen/DecoderEmitter.cpp
index 84a9d35436bef..d232195e38534 100644
--- a/llvm/utils/TableGen/DecoderEmitter.cpp
+++ b/llvm/utils/TableGen/DecoderEmitter.cpp
@@ -795,7 +795,7 @@ unsigned DecoderEmitter::emitTable(formatted_raw_ostream &OS,
   OS << "static const uint8_t DecoderTable" << Namespace;
   if (HwModeID != DefaultMode)
     OS << '_' << Target.getHwModes().getModeName(HwModeID);
-  OS << BitWidth << "[] = {\n";
+  OS << BitWidth << "[" << Table.size() << "] = {\n";
 
   // Emit ULEB128 encoded value to OS, returning the number of bytes emitted.
   auto emitULEB128 = [](DecoderTable::const_iterator &I,
@@ -978,7 +978,6 @@ unsigned DecoderEmitter::emitTable(formatted_raw_ostream &OS,
       break;
     }
   }
-  OS << "  0\n";
   OS << "};\n\n";
 
   return OpcodeMask;