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Benjamin Kramer 5938ec4cbe SCEV: Make the final add of an inbounds GEP nuw if we know that the index is positive. 
We can't do this for the general case as saying a GEP with a negative index
doesn't have unsigned wrap isn't valid for negative indices.
  %gep = getelementptr inbounds i32* %p, i64 -1

But an inbounds GEP cannot run past the end of address space. So we check for
the very common case of a positive index and make GEPs derived from that NUW.
Together with Andy's recent non-unit stride work this lets us analyze loops
like

  void foo3(int *a, int *b) {
    for (; a < b; a++) {}
  }

PR12375, PR12376.

Differential Revision: http://llvm-reviews.chandlerc.com/D2033

llvm-svn: 193514
2013-10-28 07:30:06 +00:00
autoconf Update so that it uses the `-V' command line option and supports Python 3.x. 2013-10-12 08:42:59 +00:00
bindings [python-bindings] Added support for getting/setting operands of values and getting the number of operands of a value. 2013-09-11 01:38:12 +00:00
cmake Remove NDBEUG from all release types compile flags. 2013-10-19 07:30:37 +00:00
docs A small grammar-os fixed. 2013-10-27 05:09:12 +00:00
examples Add missing #include's to cctype when using isdigit/alpha/etc. 2013-10-12 00:55:57 +00:00
include AVX-512: PMIN/PMAX intrinsics and patterns 2013-10-27 08:18:37 +00:00
lib SCEV: Make the final add of an inbounds GEP nuw if we know that the index is positive. 2013-10-28 07:30:06 +00:00
projects Revert "Revert "Windows: Add support for unicode command lines"" 2013-10-07 01:00:07 +00:00
test SCEV: Make the final add of an inbounds GEP nuw if we know that the index is positive. 2013-10-28 07:30:06 +00:00
tools MCJIT-remote: __main should be resolved in child context. 2013-10-27 10:22:52 +00:00
unittests DIEHash: Summary hashing of member functions 2013-10-25 20:04:25 +00:00
utils Clarify the comment about BSD versions in r193465 2013-10-27 20:49:19 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.clang-format Add a clang-format file so that the tool can automatically detect the 2013-09-02 07:19:04 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt CMake: set stack size for MSVC in just one place 2013-10-17 18:39:47 +00:00
CODE_OWNERS.TXT Add more owners to CODE_OWNERS.TXT (Kostya Serebryany: AddressSanitizer and ThreadSanitizer; Evgeniy Stepanov: MemorySanitizer) 2013-06-27 08:47:12 +00:00
configure Update so that it uses the `-V' command line option and supports Python 3.x. 2013-10-12 08:42:59 +00:00
CREDITS.TXT Update. 2013-09-27 20:40:40 +00:00
LICENSE.TXT Be more specific and capitalize filenames. 2013-05-21 21:22:34 +00:00
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add an autoconf option for turning on -gsplit-dwarf by default 2013-06-25 01:12:25 +00:00
Makefile.rules Makefile.rules: Avoid -fomit-frame-pointer also on cygwin due to PR14646. 2013-08-18 03:38:40 +00:00
README.txt Revert "Test commit to check e-mail address. Please discard this." 2013-10-04 10:59:13 +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
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're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.