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Quentin Colombet 6b53c89899 [X86] Model FAULTING_LOAD_OP as a terminator and branch. 
This operation may branch to the handler block and we do not want it
to happen anywhere within the basic block.
Moreover, by marking it "terminator and branch" the machine verifier
does not wrongly assume (because of AnalyzeBranch not knowing better)
the branch is analyzable. Indeed, the target was seeing only the
unconditional branch and not the faulting load op and thought it was
a simple unconditional block.
The machine verifier was complaining because of that and moreover,
other optimizations could have done wrong transformation!

In the process, simplify the representation of the handler block in
the faulting load op. Now, we directly reference the handler block
instead of using a label. This has the benefits of:
1. MC knows how to issue a label for a BB, so leave that to it.
2. Accessing the target BB from its label is painful, whereas it is
   direct from a MBB operand.

Note: The 2 bytes offset in implicit-null-check.ll comes from the
fact the unconditional jumps are not removed anymore, as the whole
terminator sequence is not analyzable anymore.

Will fix it in a subsequence commit.

llvm-svn: 268327
2016-05-02 22:58:54 +00:00
bindings Remove every uses of getGlobalContext() in LLVM (but the C API) 2016-04-14 21:59:01 +00:00
cmake Unify XDEBUG and EXPENSIVE_CHECKS (into the latter), and add an option to the cmake build to enable them. 2016-04-29 15:22:48 +00:00
docs Document the LLVM_ENABLE_EXPENSIVE_CHECKS cmake option introduced in r268050 2016-05-01 15:27:47 +00:00
examples Remove every uses of getGlobalContext() in LLVM (but the C API) 2016-04-14 21:59:01 +00:00
include [X86] Model FAULTING_LOAD_OP as a terminator and branch. 2016-05-02 22:58:54 +00:00
lib [X86] Model FAULTING_LOAD_OP as a terminator and branch. 2016-05-02 22:58:54 +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 [X86] Model FAULTING_LOAD_OP as a terminator and branch. 2016-05-02 22:58:54 +00:00
tools Simplify. NFC. 2016-05-02 22:53:32 +00:00
unittests Move coverage related code into a separate library. 2016-04-29 18:53:05 +00:00
utils [CodeGen] Add OPC_MoveChild0-OPC_MoveChild7 opcodes to isel matching tables to optimize table size. Shaves about 12K off the X86 matcher table. 2016-05-02 01:53:30 +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 Don't use misc-unused-parameters check on LLVM. 2016-04-13 08:58:52 +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 Unify XDEBUG and EXPENSIVE_CHECKS (into the latter), and add an option to the cmake build to enable them. 2016-04-29 15:22:48 +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 Fix typos 2016-05-02 19:06:51 +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.