tree f0d2dd2e6a28dae14ba9466461372167d14595ef
parent 4741b755fcfb027418608d9a0157228d4079b5ee
author Guozhi Wei <carrot@google.com> 1550858677 +0000
committer Guozhi Wei <carrot@google.com> 1550858677 +0000

[MBP] Factor out function hasViableTopFallthrough and enhancement

This patch factor out the function hasViableTopFallthrough from rotateLoop. It is also enhanced. Original code checks only if there is a block can be placed before current loop top. This patch also checks if the loop top is the most possible successor of its predecessor. The attached test case shows its effect.

Differential Revision: https://reviews.llvm.org/D58393


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354682 91177308-0d34-0410-b5e6-96231b3b80d8