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Chandler Carruth af23f8e403 Fix the root cause of PR15348 by correctly handling alignment 0 on 
memory intrinsics in the SDAG builder.

When alignment is zero, the lang ref says that *no* alignment
assumptions can be made. This is the exact opposite of the internal API
contracts of the DAG where alignment 0 indicates that the alignment can
be made to be anything desired.

There is another, more explicit alignment that is better suited for the
role of "no alignment at all": an alignment of 1. Map the intrinsic
alignment to this early so that we don't end up generating aligned DAGs.

It is really terrifying that we've never seen this before, but we
suddenly started generating a large number of alignment 0 memcpys due to
the new code to do memcpy-based copying of POD class members. That patch
contains a bug that rounds bitfield alignments down when they are the
first field. This can in turn produce zero alignments.

This fixes weird crashes I've seen in library users of LLVM on 32-bit
hosts, etc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176022 91177308-0d34-0410-b5e6-96231b3b80d8
2013-02-25 14:20:21 +00:00
autoconf configure: remove workaround for gcc's -Wno-maybe-uninitialized 2013-02-13 21:19:39 +00:00
bindings [python] Add markup option to disassembler 2012-12-01 21:57:30 +00:00
cmake Use correct host/target CMake variables to define lit variables. 2013-02-14 16:49:32 +00:00
docs Add global structure vectorization to docs 2013-02-23 13:25:41 +00:00
examples Update links to "Itanium C++ ABI: Exception Handling" document 2013-01-13 15:53:09 +00:00
include DIBuilder: support structs with vtable pointers in the same way as classes 2013-02-25 01:07:18 +00:00
lib Fix the root cause of PR15348 by correctly handling alignment 0 on 2013-02-25 14:20:21 +00:00
projects Set the deployment target for Apple llvmCore builds. <rdar://problem/12712431> 2013-02-05 17:29:03 +00:00
runtime Use 'RC_XBS' instead of 'RC_BUILDIT' to catch all times when it's built in the Apple way. 2013-02-13 19:44:08 +00:00
test Fix the root cause of PR15348 by correctly handling alignment 0 on 2013-02-25 14:20:21 +00:00
tools [objdump] Add PT_PHDR. 2013-02-21 02:21:29 +00:00
unittests Only include move-related Optional<T> tests when rvalue references are available. 2013-02-21 07:58:45 +00:00
utils Fix for bug 15246 -- out-of-bound error in the TableGen backend, CodeGenMapTable.cpp. 2013-02-14 17:58:13 +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
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt Revert CMake version bump since we don't actually need 2.8.6 any more. 2013-02-18 11:53:37 +00:00
CODE_OWNERS.TXT Add myself as code owner of AArch64 backend. 2013-01-31 12:51:16 +00:00
configure configure: remove workaround for gcc's -Wno-maybe-uninitialized 2013-02-13 21:19:39 +00:00
CREDITS.TXT Update my email address. 2012-11-29 21:17:26 +00:00
LICENSE.TXT Add LICENSE.TXT covering contributions made by ARM. 2013-01-07 10:04:49 +00:00
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt LLVMBuild: Introduce a common section which currently has a list of the 2011-12-12 22:45:54 +00:00
Makefile Improved svn repo searching for 'make update' 2013-01-28 03:19:57 +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 Pass CPPFLAGS/CFLAGS/CXXFLAGS from the environment of configure to 2013-02-04 08:15:53 +00:00
Makefile.rules Use 'RC_XBS' instead of 'RC_BUILDIT' to catch all times when it's built in the Apple way. 2013-02-13 19:44:08 +00:00
README.txt Revert "Test commit" 2013-02-22 19:19:41 +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.