[PATCH] D12513: Update edge weights properly when merging blocks in if-conversion.

[Cong Hou via llvm-commits]

congh created this revision.
congh added reviewers: MatzeB, qcolombet, davidxl.
congh added a subscriber: llvm-commits.

In if-conversion, there is a utility function MergeBlocks() that is used to merge blocks. However, when new edges are built in this function the edge weight is either not provided or not updated properly, leading to a modified CFG with incorrect edge weights. This patch corrects this issue. More information is provided in the comments.

http://reviews.llvm.org/D12513

Files:
  lib/CodeGen/IfConversion.cpp
  test/CodeGen/ARM/ifcvt-iter-indbr.ll
  test/CodeGen/Hexagon/ifcvt-edge-weight.ll

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