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Philip Reames aad4ea476e Add handling for range metadata in ValueTracking isKnownNonZero 
If we load from a location with range metadata, we can use information about the ranges of the loaded value for optimization purposes.  This helps to remove redundant checks and canonicalize checks for other optimization passes.  This particular patch checks whether a value is known to be non-zero from the range metadata.

Currently, these tests are against InstCombine.  In theory, all of these should be InstSimplify since we're not inserting any new instructions.  Moving the code may follow in a separate change.

Reviewed by: Hal
Differential Revision: http://reviews.llvm.org/D5947



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220925 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-30 20:25:19 +00:00
autoconf [OCaml] [autoconf] Migrate to ocamlfind. 2014-10-30 08:29:45 +00:00
bindings [OCaml] Expose LLVMCloneModule. 2014-10-30 08:30:12 +00:00
cmake Re-commit r220667. 2014-10-27 08:16:18 +00:00
docs VMCore was renamed to IR long time ago 2014-10-29 05:20:39 +00:00
examples Add doInitialization/doFinalization to DataLayoutPass. 2014-09-10 21:27:43 +00:00
include Fix comment spelling and tidy diagnostic call in profile reader. 2014-10-30 20:19:19 +00:00
lib Add handling for range metadata in ValueTracking isKnownNonZero 2014-10-30 20:25:19 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test Add handling for range metadata in ValueTracking isKnownNonZero 2014-10-30 20:25:19 +00:00
tools Enable the slp vectorizer in the gold plugin. 2014-10-30 00:38:54 +00:00
unittests Remove the PreserveSource linker mode. 2014-10-28 00:24:16 +00:00
utils Fix build with CMake if LLVM_USE_INTEL_JITEVENTS option is enabled 2014-10-29 09:18:49 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Initial version of Go bindings. 2014-10-16 22:48:02 +00:00
CMakeLists.txt Adding llvm-shlib to CMake build system with a few new bells and whistles 2014-10-23 17:22:14 +00:00
CODE_OWNERS.TXT Add Tom Stellard's role as 3.5 release manager. 2014-09-12 08:07:31 +00:00
configure [OCaml] [autoconf] Migrate to ocamlfind. 2014-10-30 08:29:45 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in [OCaml] [autoconf] Migrate to ocamlfind. 2014-10-30 08:29:45 +00:00
Makefile.rules Revert my earlier change to add "all" as a dependency to check. In 2014-09-19 18:44:27 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

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

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, 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
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documentation setup.

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