The (negative) offset from a SymbolTableListTraits-using ilist to its container

object is always constant.  As such, evaluate it at compile time instead of storing
it as an ivar in SymbolTableListTraits.  This shrinks every SymbolTableListTraits
ilist by a word, shrinking BasicBlock from 44->40 bytes, Function from 96->88 bytes,
and Module from 60->52 bytes.

llvm-svn: 36189

1 files changed, 0 insertions, 2 deletions

diff --git a/llvm/lib/VMCore/BasicBlock.cpp b/llvm/lib/VMCore/BasicBlock.cpp
index e10948e2ad3..431bb5090a7 100644
--- a/llvm/lib/VMCore/BasicBlock.cpp
+++ b/llvm/lib/VMCore/BasicBlock.cpp
@@ -72,8 +72,6 @@ template class SymbolTableListTraits<Instruction, BasicBlock>;
 BasicBlock::BasicBlock(const std::string &Name, Function *NewParent,
                        BasicBlock *InsertBefore)
   : Value(Type::LabelTy, Value::BasicBlockVal), Parent(0) {
-  // Initialize the instlist.
-  InstList.setItemParent(this);
 
   // Make sure that we get added to a function
   LeakDetector::addGarbageObject(this);