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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6676 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
1.3 KiB
Plaintext
34 lines
1.3 KiB
Plaintext
The modulo scheduling pass impliment modulo scheduling for llvm instruction. It includes two passes
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1. building graph
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The pass will build an instance of class ModuloSchedGraph for each loop-including basicblock in a function. The steps to build a graph:
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a)build one node for each instruction in the basicblock
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---ModuloScheduGraph::buildNodesforBB()
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b)add def-use edges
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---ModuloScheduGraph::addDefUseEdges()
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c)add cd edges
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---ModuloScheduGraph::addCDEdges()
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d)add mem dependency edges
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---ModuloScheduGraph::addMemEdges()
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e)compute resource restriction II and recurrenct II
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---ModuloScheduGraph::computeResII()
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---ModuloScheduGraph::computeRecII()
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f)compute each node's property, including ASAP,ALAP, Mov, Depth and Height.
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---ModuloScheduGraph::computeNodeProperty
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g)sort all nodes
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---ModuloScheduGraph::orderNodes()
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2. compute schedule
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The second step is to compute a schule and replace the orginal basic block with three basicblocks: prelogue, kernelblock and epilog.
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a)compute the schedule according the algorithm described in the paper
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---ModuloScheduling::computeSchedule()
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b)replace the original basicblock.(to be done)
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---ModuloScheduling::constructPrologue();
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---ModuloScheduling::constructKernel();
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---ModuloScheduling::constructEpilogue();
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These three functions are not working yet.
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