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dcc9291851
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Jingyue Wu dcc9291851 [InstCombine] mark ADD with nuw if no unsigned overflow 
Summary:
As a starting step, we only use one simple heuristic: if the sign bits
of both a and b are zero, we can prove "add a, b" do not unsigned
overflow, and thus convert it to "add nuw a, b".

Updated all affected tests and added two new tests (@zero_sign_bit and
@zero_sign_bit2) in AddOverflow.ll

Test Plan: make check-all

Reviewers: eliben, rafael, meheff, chandlerc

Reviewed By: chandlerc

Subscribers: chandlerc, llvm-commits

Differential Revision: http://reviews.llvm.org/D4144

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211084 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-17 00:42:07 +00:00
autoconf Remove path_tclsh.m4. 2014-06-02 12:54:32 +00:00
bindings [OCaml] Unbreak Llvm_target.TargetMachine.set_verbose_asm 2014-06-09 17:34:34 +00:00
cmake Remove clang-specific libxml2 check from CMake 2014-06-06 05:08:42 +00:00
docs Revert r211066, 211067, 211068, 211069, 211070. 2014-06-16 22:49:41 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include Expose ValueMap's mutex type as a typedef instead of a sys::Mutex. 2014-06-17 00:17:38 +00:00
lib [InstCombine] mark ADD with nuw if no unsigned overflow 2014-06-17 00:42:07 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test [InstCombine] mark ADD with nuw if no unsigned overflow 2014-06-17 00:42:07 +00:00
tools Convert the Archive API to use ErrorOr. 2014-06-16 16:08:36 +00:00
unittests Fix build breakage caused by change to ValueMapTest. 2014-06-17 00:38:40 +00:00
utils Revert "lit: warn when passed invalid pathname" (r210597) 2014-06-16 20:18:41 +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
.gitignore Remove projects/sample. 2014-03-12 22:40:22 +00:00
CMakeLists.txt Delete trailing whitespace. 2014-06-12 21:27:03 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure Touch configure to force clang's config.h.in reconfiguration on the build servers 2014-06-06 10:36:38 +00:00
CREDITS.TXT Update Credits. 2014-05-29 19:59:58 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +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 a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
Makefile.rules autoconf: Fix libLLVM-Major-Minor-Patch.so symlink 2014-05-15 19:50:25 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

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

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Please see the documentation provided in docs/ for further
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