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Sanjoy Das b500839596 [SCEV] Fix an assertion failure in the max backedge taken count 
Max backedge taken count is always expected to be a constant; and this is
usually true by construction -- it is a SCEV expression with constant inputs.
However, if the max backedge expression ends up being computed to be a udiv with
a constant zero denominator[0], SCEV does not fold the result to a constant
since there is no constant it can fold it to (SCEV has no representation for
"infinity" or "undef").

However, in computeMaxBECountForLT we already know the denominator is positive,
and thus at least 1; and we can use this fact to avoid dividing by zero.

[0]: We can end up with a constant zero denominator if the signed range of the
stride is more precise than the unsigned range.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316615 91177308-0d34-0410-b5e6-96231b3b80d8
2017-10-25 21:41:00 +00:00
bindings Reverting r315590; it did not include changes for llvm-tblgen, which is causing link errors for several people. 2017-10-15 14:32:27 +00:00
cmake [cmake] Restrict resource file usage to Windows build hosts 2017-10-25 17:11:28 +00:00
docs Added instructions for obtaining clang-tools-extra to the Getting Started page. 2017-10-24 17:28:39 +00:00
examples Fix broken links to the Itanium CXX ABI 2017-09-12 00:19:11 +00:00
include Add a comment to clarify a future change 2017-10-25 21:40:59 +00:00
lib [SCEV] Fix an assertion failure in the max backedge taken count 2017-10-25 21:41:00 +00:00
projects Add temporary workaround to allow in-tree libc++ builds on Windows 2017-05-11 01:44:30 +00:00
resources
runtimes [CMake][runtimes] Use the same configuration for non-target and "default" target 2017-09-08 22:26:50 +00:00
test [SCEV] Fix an assertion failure in the max backedge taken count 2017-10-25 21:41:00 +00:00
tools Add FileVerifier::isCFIProtected(). 2017-10-25 21:21:16 +00:00
unittests Revert r316582 [Local] Fix a bug in the domtree update logic for MergeBasicBlockIntoOnlyPred. 2017-10-25 21:32:54 +00:00
utils [globalisel][tablegen] Fix future undefined behaviour in r316463. 2017-10-24 18:11:54 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format
.clang-tidy
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [CMake] Allow parent projects to use in-source builds 2017-10-19 00:43:48 +00:00
CODE_OWNERS.TXT [ARC] Add ARC backend. 2017-08-24 15:40:33 +00:00
configure
CREDITS.TXT Add myself to CREDITS.txt 2017-09-18 14:33:39 +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 [RelTest] Diana is doing both releases now 2017-07-14 08:33:52 +00:00

README.txt 

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

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.