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

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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36189 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-04-17 04:04:14 +00:00
parent 17fcdd5e1b
commit f8dfef7437
8 changed files with 70 additions and 17 deletions
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12
include/llvm/BasicBlock.h
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@ -31,6 +31,7 @@ template<> struct ilist_traits<Instruction>
static void destroySentinel(Instruction *I) { delete I; }
static iplist<Instruction> &getList(BasicBlock *BB);
static ValueSymbolTable *getSymTab(BasicBlock *ItemParent);
static int getListOffset();
};
/// This represents a single basic block in LLVM. A basic block is simply a
@ -194,8 +195,19 @@ public:
/// the basic block).
///
BasicBlock *splitBasicBlock(iterator I, const std::string &BBName = "");
static unsigned getInstListOffset() {
BasicBlock *Obj = 0;
return reinterpret_cast<unsigned>(&Obj->InstList);
}
};
inline int
ilist_traits<Instruction>::getListOffset() {
return BasicBlock::getInstListOffset();
}
} // End llvm namespace
#endif