Really add a comment

s-barannikov · s-barannikov · commit d7b6fcfb0afd · 2025-09-19T00:50:19.000+03:00
diff --git a/llvm/utils/TableGen/DecoderTableEmitter.cpp b/llvm/utils/TableGen/DecoderTableEmitter.cpp
@@ -58,6 +58,8 @@ DecoderTableEmitter::computeNodeSize(const DecoderTreeNode *Node) const {
       Size += getULEB128Size(Val) + getULEB128Size(ChildSize) + ChildSize;
     }
 
+    // The last child is emitted with sentinel value 0 instead of the size.
+    // See the comment in emitSwitchFieldNode.
     auto [Val, Child] = *std::prev(N->case_end());
     unsigned ChildSize = computeNodeSize(Child);
     Size += getULEB128Size(Val) + getULEB128Size(0) + ChildSize;

Original file line number	Diff line number	Diff line change
`@@ -58,6 +58,8 @@ DecoderTableEmitter::computeNodeSize(const DecoderTreeNode *Node) const {`
`58`	`58`	`Size += getULEB128Size(Val) + getULEB128Size(ChildSize) + ChildSize;`
`59`	`59`	`}`
`60`	`60`
	`61`	`+ // The last child is emitted with sentinel value 0 instead of the size.`
	`62`	`+ // See the comment in emitSwitchFieldNode.`
`61`	`63`	`auto [Val, Child] = *std::prev(N->case_end());`
`62`	`64`	`unsigned ChildSize = computeNodeSize(Child);`
`63`	`65`	`Size += getULEB128Size(Val) + getULEB128Size(0) + ChildSize;`