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2004 Feb 13
0
[LLVMdev] ilistification of MachineBasicBlock
...d
how does it affect you? Read on.
MachineBasicBlock used to have a std::vector<MachineInstr*> to represent
the instructions it constisted of. This representation has the following
problems:
1) O(n) insertions/removals to/from anywhere but the end of a basic
block (removals are very comomn in peephole optimizers and insertions in
register allocators)
2) After an insertion all std::vector<MachineInstr*>::iterators are
invalidated.
3) After an erase all std::vector<MachineInstr*>::iterators after
it are invalidated.
After ilistification, MachineBasicBlock uses...