commit e469ef7495ac8908579086ee925503f170e8bb45
author Guozhi Wei <carrot@google.com> Fri Feb 22 18:04:37 2019 +0000
committer Guozhi Wei <carrot@google.com> Fri Feb 22 18:04:37 2019 +0000
tree f0d2dd2e6a28dae14ba9466461372167d14595ef
parent 4741b755fcfb027418608d9a0157228d4079b5ee

[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