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Philip Reames a404b6f421 [RewriteStatepointsForGC] Exclude constant values from being considered live at a safepoint 
There can be various constant pointers in the IR which do not get relocated at a safepoint. One example is the address of a global variable. Another example is a pointer created via inttoptr. Note that the optimizer itself likes to create such inttoptrs when locally propagating constants through dynamically dead code.

To deal with this, we need to exclude uses of constants from contributing to the liveness of a safepoint which might reach that use. At some later date, it might be worth exploring what could be done to support the relocation of various special types of "constants", but that's future work.

Differential Revision: http://reviews.llvm.org/D9236



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235821 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-26 19:48:03 +00:00
autoconf Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
bindings DebugInfo: Remove DIArray and DITypeArray typedefs 2015-04-21 20:07:38 +00:00
cmake [CMake] Fix for PR 23328: LLVM_OPTIMIZED_TABLEGEN broken 2015-04-24 17:09:20 +00:00
docs Minor edits to the llvm-cov documentation. 2015-04-21 16:32:02 +00:00
examples [Kaleidoscope] Fix incorrect use of reinterpret_cast. 2015-04-22 20:58:34 +00:00
include IR: Add Function metadata attachments 2015-04-24 21:51:02 +00:00
lib [RewriteStatepointsForGC] Exclude constant values from being considered live at a safepoint 2015-04-26 19:48:03 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +00:00
test [RewriteStatepointsForGC] Exclude constant values from being considered live at a safepoint 2015-04-26 19:48:03 +00:00
tools [AsmPrinter] Make AsmPrinter's OutStreamer member a unique_ptr. 2015-04-24 19:11:51 +00:00
unittests Verifier: Function metadata attachments require a body 2015-04-24 21:53:27 +00:00
utils [TableGen] Don't leak Expanders and Operators in SetTheory. 2015-04-24 06:49:44 +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 Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Ignore compile_commands.json only at the root of the tree. 2015-03-26 18:55:42 +00:00
CMakeLists.txt [CMake] Updates to llvm-shlib to support overriding exports list and added an option to export all symbols. 2015-04-13 21:29:46 +00:00
CODE_OWNERS.TXT Add myself as the Constant Folder owner. 2015-04-20 23:19:10 +00:00
configure Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
Makefile.rules Add support for SunOS function/data sections and associated 2015-03-03 20:54:29 +00:00
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +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're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.