Victor Lomuller 50e85c865c Add LoopUtils class to gather some loop transformation support. ... This patch adds LoopUtils class to handle some loop related transformations. For now it has 2 transformations that simplifies other transformations such as loop unroll or unswitch: - Dedicate exit blocks: this ensure that all exit basic block (out-of-loop basic blocks that have a predecessor in the loop) have all their predecessors in the loop; - Loop Closed SSA (LCSSA): this ensure that all definitions in a loop are used inside the loop or in a phi instruction in an exit basic block. It also adds the following capabilities: - Loop::IsLCSSA to test if the loop is in a LCSSA form - Loop::GetOrCreatePreHeaderBlock that can build a loop preheader if required; - New methods to allow on the fly updates of the loop descriptors. - New methods to allow on the fly updates of the CFG analysis. - Instruction::SetOperand to allow expression of the index relative to Instruction::NumOperands (to be compatible with the index returned by DefUseManager::ForEachUse)		2018-02-01 15:35:09 -05:00
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CMakeLists.txt	Add LoopUtils class to gather some loop transformation support.	2018-02-01 15:35:09 -05:00
lcssa.cpp	Add LoopUtils class to gather some loop transformation support.	2018-02-01 15:35:09 -05:00
loop_descriptions.cpp	Add LoopUtils class to gather some loop transformation support.	2018-02-01 15:35:09 -05:00
nested_loops.cpp	Add LoopUtils class to gather some loop transformation support.	2018-02-01 15:35:09 -05:00