Currently it has a set KnownBlocks that marks blocks as having cached
answers and a map FirstSpecialInsts that maps these blocks to first
special instructions in them. The value in the map is always non-null,
and for blocks that are known to have no special instructions the map
does not have an instance.
This patch removes KnownBlocks as obsolete. Instead, for blocks that
are known to have no special instructions, we just put a nullptr value.
This makes the code much easier to read.
llvm-svn: 341531
This validation patch has been reverted as rL341147 because of conserns raised by
@reames. This revision returns it as is to raise a discussion and address the concerns.
Differential Revision: https://reviews.llvm.org/D51523
Reviewed By: reames
llvm-svn: 341526
These classes don't make any changes to IR and have no reason to be in
Transform/Utils. This patch moves them to Analysis folder. This will allow
us reusing these classes in some analyzes, like MustExecute.
llvm-svn: 341015
Max Kazantsev