Cong Hou 3f81410d8c Record whether the weights on out-edges from a MBB are normalized.
1. Create a utility function normalizeEdgeWeights() in MachineBranchProbabilityInfo that normalizes a list of edge weights so that the sum of then can fit in uint32_t.
2. Provide an interface in MachineBasicBlock to normalize its successors' weights.
3. Add a flag in MachineBasicBlock that tracks whether its successors' weights are normalized.
4. Provide an overload of getSumForBlock that accepts a non-const pointer to a MBB so that it can force normalizing this MBB's successors' weights.
5. Update several uses of getSumForBlock() by eliminating the once needed weight scale.

Differential Revision: http://reviews.llvm.org/D11442



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244154 91177308-0d34-0410-b5e6-96231b3b80d8
2015-08-05 22:01:20 +00:00
2014-04-07 03:57:04 +00:00
2014-03-02 13:08:46 +00:00
2015-03-12 01:25:29 +00:00

Low Level Virtual Machine (LLVM)
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