LLVM backend for 6502
Go to file
Evgeniy Stepanov 4031b194ac [msan] Do not store origin for clean values.
Instead of unconditionally storing origin with every application store,
only do this when the shadow of the stored value is != 0.

This change also delays instrumentation of stores until after the walk over
function's instructions, because adding new basic blocks confuses InstVisitor.

We only keep 1 origin value per 4 bytes of application memory. This change
fixes the bug when a store of a single clean byte wiped the origin for the
whole 4-byte area.

Since stores of uninitialized values are relatively uncommon, this change
improves performance of track-origins mode by 5% median and by up to 47% on
specs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169490 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-06 11:41:03 +00:00
autoconf Fix a pasto. 2012-11-19 19:31:02 +00:00
bindings [python] Add markup option to disassembler 2012-12-01 21:57:30 +00:00
cmake Removing SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG 2012-11-26 02:02:08 +00:00
docs docs: Explain plain preformatted text 2012-12-05 04:07:33 +00:00
examples Sort the #include lines of the examples/... tree. 2012-12-04 10:16:57 +00:00
include Handle non-default array bounds. 2012-12-06 07:38:10 +00:00
lib [msan] Do not store origin for clean values. 2012-12-06 11:41:03 +00:00
projects Clean up the sample include orderings, not that it really matters... 2012-12-04 10:46:21 +00:00
runtime libprofile/CommonProfiling.c: Fix according to C89. 2012-11-02 01:32:02 +00:00
test [msan] Do not store origin for clean values. 2012-12-06 11:41:03 +00:00
tools Quick build fix for c++03 clang. This needs a proper solution. Note that these offsets are guaranteed to be correct by Endian.h. 2012-12-05 22:38:01 +00:00
unittests Do not run tests MappedMemoryTest.BasicWrite and MultipleWrite unless both 2012-12-05 22:43:07 +00:00
utils PR10867: Analogue of r169441 for when using external 'sh'. And actually run the test! 2012-12-05 23:15:33 +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 Kick off 3.3 cycle for LLVM trunk. 2012-11-17 22:01:08 +00:00
CODE_OWNERS.TXT Taking ownership of indvars/lsr. 2012-12-05 23:32:44 +00:00
configure Fix a pasto. 2012-11-19 19:31:02 +00:00
CREDITS.TXT Update my email address. 2012-11-29 21:17:26 +00:00
LICENSE.TXT Few more small CellSPU removals. 2012-11-14 22:13:56 +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 [c-index-test] When building with BUILD_CLANG_ONLY=YES, include c-index-test. 2012-11-06 19:54:46 +00:00
Makefile.common [docs] Remove unsupported references to ExtraSource variable. 2012-05-15 21:32:27 +00:00
Makefile.config.in Re-enable support for --program-prefix. 2012-10-01 18:40:32 +00:00
Makefile.rules Use MACOSX_DEPLOYMENT_TARGET when it is set. <rdar://problem/12433905> 2012-10-12 21:48:14 +00:00
README.txt Test commit. 2012-11-29 16:19:11 +00:00

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 HTML documentation provided in docs/index.html for further
assistance with LLVM.

If you're writing a package for LLVM, see docs/Packaging.html for our
suggestions.