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58217
2017 Dec 19
4
A code layout related side-effect introduced by rL318299
Hi,
Recently 10% performance regression on an important benchmark showed up
after we integrated https://reviews.llvm.org/rL318299. The analysis showed
that rL318299 triggered loop rotation on an multi exits loop, and the loop
rotation introduced code layout issue. The performance regression is a
side-effect of rL318299. I got two testcases a.ll and b.ll attached to
illustrate the problem. a.ll