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Max Kazantsev 460e952639 [LoopSimplify] Fix incorrect SCEV invalidation 
In the function `simplifyOneLoop` we optimistically assume that changes in the
inner loop only affect this very loop and have no impact on its parents. In fact,
after rL329047 has been merged, we can now calculate exit counts for outer
loops which may depend on inner loops. Thus, we need to invalidate all parents
when we do something to a loop.

There is an evidence of incorrect behavior of `simplifyOneLoop`: when we insert
`SE->verify()` check in the end of this funciton, it fails on a bunch of existing
test, in particular:

    LLVM :: Transforms/LoopUnroll/peel-loop-not-forced.ll
    LLVM :: Transforms/LoopUnroll/peel-loop-pgo.ll
    LLVM :: Transforms/LoopUnroll/peel-loop.ll
    LLVM :: Transforms/LoopUnroll/peel-loop2.ll

Note that previously we have fixed issues of this variety, see rL328483.
This patch makes this function invalidate the outermost loop properly.

Differential Revision: https://reviews.llvm.org/D45937
Reviewed By: chandlerc

llvm-svn: 330576
2018-04-23 10:32:37 +00:00
bindings [LLVM-C] Add DIBuilder Bindings For Variable Creation 2018-04-22 19:24:44 +00:00
cmake [cmake] Improve pthread_[gs]etname_np detection code 2018-04-18 13:13:27 +00:00
docs Fix BNF nits in TableGen language reference. 2018-04-23 09:15:47 +00:00
examples [ORC] Create a new SymbolStringPool by default in ExecutionSession constructor. 2018-04-02 20:57:56 +00:00
include [LoopSimplify] Fix incorrect SCEV invalidation 2018-04-23 10:32:37 +00:00
lib [LoopSimplify] Fix incorrect SCEV invalidation 2018-04-23 10:32:37 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +00:00
resources
runtimes [CMake][runtimes] Process common options in runtimes build 2018-04-11 05:18:03 +00:00
test [LoopSimplify] Fix incorrect SCEV invalidation 2018-04-23 10:32:37 +00:00
tools [LLVM-C] Add DIBuilder Bindings For Variable Creation 2018-04-22 19:24:44 +00:00
unittests Revert "Revert r330403 and r330413." 2018-04-20 13:34:32 +00:00
utils [X86] Remove an unnecessary HANDLE_OPTIONAL line from the disassembler operand processing. 2018-04-22 06:40:37 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy
.gitattributes [MC] Fix regression tests on Windows when git “core.autocrlf” is set to true. 2017-11-17 21:59:43 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [llvm-exegesis] Add a flag to disable libpfm even if present. 2018-04-11 07:32:43 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take code ownership of llvm-mca. 2018-04-20 10:16:31 +00:00
configure
CREDITS.TXT Add myself to CREDITS.txt 2018-01-29 17:02:34 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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