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Oliver Stannard 7248f4417e [ARM] Avoid switching ARM/Thumb mode on .arch/.cpu directive 
When we see a .arch or .cpu directive, we should try to avoid switching
ARM/Thumb mode if possible.

If we do have to switch modes, we also need to emit the correct mapping
symbol for the new ISA. We did not do this previously, so could emit
ARM code with Thumb mapping symbols (or vice-versa).

The GAS behaviour is to always stay in the same mode, and to emit an
error on any instructions seen when the current mode is not available on
the current target. We can't represent that situation easily (we assume
that Thumb mode is available if ModeThumb is set), so we differ from the
GAS behaviour when switching to a target that can't support the old
mode. I've added a warning for when this implicit mode-switch occurs.

Differential Revision: http://reviews.llvm.org/D18955

llvm-svn: 265936
2016-04-11 13:06:28 +00:00
bindings [OCaml] Expose the LLVM diagnostic handler 2016-04-10 13:55:53 +00:00
cmake [CMake] Make llvm_ExternalProject always call the build action 2016-04-08 22:46:04 +00:00
docs [SSP] Remove llvm.stackprotectorcheck. 2016-04-08 21:26:31 +00:00
examples [Kaleidoscope] Rename Error -> LogError in Chapters 2-5. 2016-03-25 17:41:26 +00:00
include [SCEV] See through op.with.overflow intrinsics 2016-04-10 22:50:26 +00:00
lib [ARM] Avoid switching ARM/Thumb mode on .arch/.cpu directive 2016-04-11 13:06:28 +00:00
projects Remove autoconf support 2016-01-26 21:29:08 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
test [ARM] Avoid switching ARM/Thumb mode on .arch/.cpu directive 2016-04-11 13:06:28 +00:00
tools Support the Nodebug emission kind for DICompileUnits. 2016-04-08 22:43:03 +00:00
unittests Fix asan test failure 2016-04-10 05:31:29 +00:00
utils vim: add missing keyword 2016-04-06 17:42:16 +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 adding readability-identifier-naming to llvm clang-tidy configuration. 2015-12-08 17:44:51 +00:00
.gitignore Minor updates to gitignore so that symlinks are ignored in the projects dir. 2015-07-07 20:24:58 +00:00
CMakeLists.txt dos2unix CMakeLists.txt 2016-03-28 18:19:32 +00:00
CODE_OWNERS.TXT Update owners to reflect recent changes 2016-04-01 20:40:49 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT [WebAssembly] Initial WebAssembly backend 2015-06-29 23:51:55 +00:00
LICENSE.TXT Update copyright year to 2016. 2016-03-30 22:41:06 +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 Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Revert previous test commit. 2016-01-04 19:13:29 +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.