tree afe2339cead950440c92cb061e98e9a69f04c36b
parent 91735b456996e82a7f5d3224692e3e58cec48578
author Vedant Kumar <vsk@apple.com> 1550256404 +0000
committer Vedant Kumar <vsk@apple.com> 1550256404 +0000

[HotColdSplit] Schedule splitting late to fix perf regression

With or without PGO data applied, splitting early in the pipeline
(either before the inliner or shortly after it) regresses performance
across SPEC variants. The cause appears to be that splitting hides
context for subsequent optimizations.

Schedule splitting late again, in effect reversing r352080, which
scheduled the splitting pass early for code size benefits (documented in
https://reviews.llvm.org/D57082).

Differential Revision: https://reviews.llvm.org/D58258

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354158 91177308-0d34-0410-b5e6-96231b3b80d8