[CodeGen] Align rtti and vtable data
Previously the alignment on the newly created rtti/typeinfo data was largely
not set, meaning that DataLayout::getPreferredAlignment was free to overalign
it to 16 bytes. This causes unnecessary code bloat.
Differential Revision: https://reviews.llvm.org/D51416
llvm-svn: 342053
diff --git a/clang/lib/CodeGen/CGVTables.cpp b/clang/lib/CodeGen/CGVTables.cpp
index d07c160..df20b9b 100644
--- a/clang/lib/CodeGen/CGVTables.cpp
+++ b/clang/lib/CodeGen/CGVTables.cpp
@@ -756,9 +756,11 @@
if (Linkage == llvm::GlobalVariable::AvailableExternallyLinkage)
Linkage = llvm::GlobalVariable::InternalLinkage;
+ unsigned Align = CGM.getDataLayout().getABITypeAlignment(VTType);
+
// Create the variable that will hold the construction vtable.
llvm::GlobalVariable *VTable =
- CGM.CreateOrReplaceCXXRuntimeVariable(Name, VTType, Linkage);
+ CGM.CreateOrReplaceCXXRuntimeVariable(Name, VTType, Linkage, Align);
CGM.setGVProperties(VTable, RD);
// V-tables are always unnamed_addr.