[LLVMdev] Question of implementation of EBB in LLVM

[alian]

GCC in the sched2 stage, there are two kinds of scheduling scheme:
(1)EBB (extended basic block) based method,when turn on option -fsched2-use-superblocks.
(2)single basic block region based method.
I want to konw the implementation of EBB in LLVM, is it implementation in LLVM?and in which stage?
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