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Anna Thomas aaa1cad9b5 [AliasAnalysis] Fences do not modify constant memory location 
Summary:
Fence instructions are currently marked as `ModRef` for all memory locations.

We can improve this for constant memory locations (such as constant globals),
since fence instructions cannot modify these locations.

This helps us to forward constant loads across fences (added test case in GVN).
There were no changes in behaviour for similar test cases in early-cse and licm.

Reviewers: dberlin, sanjoy, reames

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D28914

llvm-svn: 292546
2017-01-20 00:21:33 +00:00
bindings Fix go bindings after r289702 (hopefully, don't really know how to build 2016-12-15 06:54:29 +00:00
cmake cmake: Only sanitize use-after-scope if the host compiler supports it 2017-01-18 19:01:58 +00:00
docs [docs] Tell Doxygen to expand LLVM_ALIGNAS to nothing 2017-01-19 13:37:42 +00:00
examples BrainF example: fixing output buffering issue 2017-01-17 13:27:28 +00:00
include [AliasAnalysis] Fences do not modify constant memory location 2017-01-20 00:21:33 +00:00
lib [AliasAnalysis] Fences do not modify constant memory location 2017-01-20 00:21:33 +00:00
llvm/Target/GlobalISel Re-commit: [globalisel] Tablegen-erate current Register Bank Information 2017-01-19 11:15:55 +00:00
projects [CMake] Correct configuration order of the sub-projects based on ther dependancies 2016-10-09 20:38:29 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Handle common options for runtimes build 2017-01-10 19:47:05 +00:00
test [AliasAnalysis] Fences do not modify constant memory location 2017-01-20 00:21:33 +00:00
tools Add support for the new LC_NOTE load command. 2017-01-19 17:36:31 +00:00
unittests [pdb] Add HashTable data structure. 2017-01-19 23:31:24 +00:00
utils Re-commit: [globalisel] Tablegen-erate current Register Bank Information 2017-01-19 11:15:55 +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 Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore [AVR] Add the integrated testing tool to the .gitignore 2016-12-14 11:47:14 +00:00
CMakeLists.txt Bump trunk version to 5.0.0svn 2017-01-12 21:22:36 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take ownership of IR Linker as discussed on llvm-dev 2016-12-02 14:06:53 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Revert revision 289721. 2016-12-14 21:58:42 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt
README.txt Test commit, deleted empty line at the end of README.txt 2016-11-07 18:31:21 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +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.