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David Callahan 48aa68965f [ADCE] Modify data structures to support removing control flow 
Summary:
This is part of a serious of patches to evolve ADCE.cpp to support
removing of unnecessary control flow.

This patch changes the data structures to hold liveness information to
support the additional information we will eventually need. In
particular we now have a notion of basic blocks being live because
they contain a live operations. This will eventually feed into control
dependence analysis of which branches are live. We cater to getting
from instructions to associated block information and from blocks to
information about their terminators.

This patch also changes the structure of the main loop of the
algorithm so that it alternates propagating liveness between
instructions and usign control dependence information to mark branches
live.

We force all terminators live for now until we add code to handlinge
removing control flow in a later patch.

No changes to effective behavior with this patch

Previous patches:

D23065 [ADCE] Refactor anticipating new functionality (NFC)
D23102 [ADCE] Refactoring for new functionality (NFC)

Reviewers: nadav, majnemer, mehdi_amini

Subscribers: freik, twoh, llvm-commits

Differential Revision: https://reviews.llvm.org/D23225

llvm-svn: 278807
2016-08-16 14:31:51 +00:00
bindings
cmake Remove LLVM_ENABLE_LIBCXXABI 2016-08-04 10:24:48 +00:00
docs Revert "Revert "Invariant start/end intrinsics overloaded for address space"" 2016-08-13 23:31:24 +00:00
examples Use the range variant of find instead of unpacking begin/end 2016-08-11 22:21:41 +00:00
include [GlobalISel] Mention pointers in LowLevelType.h. NFC. 2016-08-16 14:02:36 +00:00
lib [ADCE] Modify data structures to support removing control flow 2016-08-16 14:31:51 +00:00
projects
resources
runtimes
test [Pipeliner] Fix an asssert due to invalid Phi in the epilog 2016-08-16 14:29:24 +00:00
tools [ThinLTO] Fix temp file dumping, enable via llvm-lto and test it 2016-08-15 23:24:57 +00:00
unittests [ADT] Change PostOrderIterator to use NodeRef. NFC. 2016-08-15 21:52:54 +00:00
utils Use the range variant of remove_if instead of unpacking begin/end 2016-08-12 04:32:37 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +00:00
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt Remove LLVM_ENABLE_LIBCXXABI 2016-08-04 10:24:48 +00:00
CODE_OWNERS.TXT test commit 2016-08-02 19:25:17 +00:00
configure
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT Remove autoconf references from LICENSE.TXT 2016-08-12 20:11:03 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Revert rL277454 2016-08-02 13:26:07 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +00:00

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