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Philip Reames b567b75641 [SCEV] Expose and use maximum constant exit counts for individual loop exits 
We were already going to all of the trouble of computing maximum constant exit counts for each loop exit, we might as well expose them through the API.  The change in IndVars is mostly to demonstrate that the wired up code works, but it als very slightly strengthens the transform.  The strengthened case is rather narrow though: it requires one exactly analyzeable exit, one imprecisely analyzeable exit (with the upper bound less than the precise one), and one unanalyzeable exit.  I coudn't construct a reasonably stable test case.

This does increase the memory usage of the BackedgeTakenCount by a factor of 2 in the worst case.

I also noticed the loop in IndVars is O(#Exits ^ 2).  This doesn't change with this patch.  A future patch will cache this result inside of SCEV to avoid requering.
2019-10-24 19:07:33 -07:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings Reapply r374743 with a fix for the ocaml binding 2019-10-14 16:15:14 +00:00
cmake [CMake] [WinMsvc] Look for includes and libs in ${MSVC_BASE}/atlmfc 2019-10-22 06:36:27 +00:00
docs [docs] Add Mips as a supported architecture in GettingStarted.rst 2019-10-24 15:56:30 +03:00
examples [examples] Add a dependency on ExecutionEngine to LLJITWithObjectCache example. 2019-10-21 22:29:29 +00:00
include [SCEV] Expose and use maximum constant exit counts for individual loop exits 2019-10-24 19:07:33 -07:00
lib [SCEV] Expose and use maximum constant exit counts for individual loop exits 2019-10-24 19:07:33 -07:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds. 2019-09-24 22:38:18 +00:00
test Test commit via git. 2019-10-25 01:36:55 +00:00
tools [llvm-ifs][NFC] Adds TODO comment for dropping ObjectFileFormat on yaml format. 2019-10-24 10:14:34 -07:00
unittests Revert "Disable exit-on-SIGPIPE in lldb" 2019-10-24 13:19:49 -07:00
utils Use portable flag with nm in extract_symbols.py 2019-10-23 16:48:22 -04:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
CODE_OWNERS.TXT Update email address in CODE_OWNERS 2019-07-01 16:01:15 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
README.txt Test commit. 2019-10-03 14:57:49 +00:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

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.