Port CodeGenPrepare to new pass manager and dependency
BasicBlockSectionsProfileReader
Fixes: #75380
Co-authored-by: Krishna-13-cyber <84722531+Krishna-13-cyber@users.noreply.github.com>
Revert e0c554ad87d18dcbfcb9b6485d0da800ae1338d1 "Port CodeGenPrepare to new pass manager (and BasicBlockSectionsProfil… (#75380)"
Revert #75380 and #77054 as they were breaking EXPENSIVE_CHECKS buildbots: https://lab.llvm.org/buildbot/#/builders/104
Port CodeGenPrepare to new pass manager and dependency
BasicBlockSectionsProfileReader
Fixes: #64560
Co-authored-by: Krishna-13-cyber <84722531+Krishna-13-cyber@users.noreply.github.com>
Before elimination of mostly empty block it makes sense to remove dead PHI nodes.
It open more opportunity for elimination plus eliminates dead code itself.
It appeared that change results in failing many unit tests and some of
them I've updated and for another one I disable this optimization.
The pattern I observed in the tests is that there is a infinite loop
without side effects. As a result after elimination of dead phi node all other
related instruction are also removed and tests stops to check what it is expected.
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D158503
This fixes an inconsistency in code generation when compiling with or
without debug information (-g). When debug information is available in
an empty block, the original test would fail, resulting in possibly
different code.
Patch by: Jeroen Dobbelaere
Differential revision: https://reviews.llvm.org/D49467
llvm-svn: 339129
