[codeview] Update comment on aligning symbol records
llvm-svn: 349433
diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index 78e5f5d..4132b1a 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -2831,8 +2831,10 @@
}
void CodeViewDebug::endSymbolRecord(MCSymbol *SymEnd) {
- // Symbol records in object files are not aligned, although we are considering
- // it for linker performance reasons.
+ // MSVC does not pad out symbol records to four bytes, but LLVM does to avoid
+ // an extra copy of every symbol record in LLD. This increases object file
+ // size by less than 1% in the clang build, and is compatible with the Visual
+ // C++ linker.
OS.EmitValueToAlignment(4);
OS.EmitLabel(SymEnd);
}