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f68f28a41d
In a CFG with the edges A->B->C and A->C, B is an optional branch. LLVM's default behavior is to lay the blocks out naturally, i.e. A, B, C, in order to improve code locality and fallthroughs. However, if a function contains many of those optional branches only a few of which are taken, this leads to a lot of unnecessary icache misses. Moving B out of line can work around this. Review: http://reviews.llvm.org/D7719 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231230 91177308-0d34-0410-b5e6-96231b3b80d8 |
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