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Peter Collingbourne acf4cf7757 Introduce an optimisation for special case lists with large numbers of literal entries. 
Our internal regex implementation does not cope with large numbers
of anchors very efficiently.  Given a ~3600-entry special case list,
regex compilation can take on the order of seconds.  This patch solves
the problem for the special case of patterns matching literal global
names (i.e. patterns with no regex metacharacters).  Rather than
forming regexes from literal global name patterns, add them to
a StringSet which is checked before matching against the regex.
This reduces regex compilation time by an order of roughly thousands
when reading the aforementioned special case list, according to a
completely unscientific study.

No test cases.  I figure that any new tests for this code should
check that regex metacharacters are properly recognised.  However,
I could not find any documentation which documents the fact that the
syntax of global names in special case lists is based on regexes.
The extent to which regex syntax is supported in special case lists
should probably be decided on/documented before writing tests.

Differential Revision: http://llvm-reviews.chandlerc.com/D1150

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187732 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-05 17:48:04 +00:00
autoconf Link with -rdynamic instead of -Wl,-export-dynamic. 2013-08-02 22:51:06 +00:00
bindings We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
cmake Pass -G argument to cmake with the same generator's name as used for the 2013-08-01 18:04:07 +00:00
docs Update the release notes about the status of the vectorizers. 2013-08-05 04:31:05 +00:00
examples ExceptionDemo.cpp: Tweak a @param. [-Wdocumentation] 2013-07-29 11:03:50 +00:00
include Introduce an optimisation for special case lists with large numbers of literal entries. 2013-08-05 17:48:04 +00:00
lib Introduce an optimisation for special case lists with large numbers of literal entries. 2013-08-05 17:48:04 +00:00
projects Build with the $RDYNAMIC flag on Darwin as well as other platforms. 2013-08-04 22:06:11 +00:00
runtime Use @rpath for libraries rather than @executable_path on OSX. 2013-08-02 01:51:52 +00:00
test LLVM Interpreter: This patch implements vector support for cast operations (zext, sext, uitofp, sitofp, trunc, fpext, fptosi, fptrunc, bitcast) and shift operations (shl, ashr, lshr) for integer and floating point data types. 2013-08-05 12:17:06 +00:00
tools Unbreak llvm-rtdyld build. 2013-08-03 22:18:45 +00:00
unittests Introduce Regex::isLiteralERE function. 2013-08-05 17:47:59 +00:00
utils Fix handling of CHECK-DAG combined with CHECK-NOT 2013-08-02 11:32:50 +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 Add capability for building with -gsplit-dwarf to the cmake build. 2013-07-30 21:44:10 +00:00
CODE_OWNERS.TXT Add more owners to CODE_OWNERS.TXT (Kostya Serebryany: AddressSanitizer and ThreadSanitizer; Evgeniy Stepanov: MemorySanitizer) 2013-06-27 08:47:12 +00:00
configure Regenerate with changes for -rdynamic. 2013-08-02 22:51:11 +00:00
CREDITS.TXT Identify me on IRC. 2013-06-18 22:09:36 +00:00
LICENSE.TXT Be more specific and capitalize filenames. 2013-05-21 21:22:34 +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 Fix regular expression used by 'make update' to only look for 'I' and '?' at the start of svn info results and to check for spaces after 'I' instead of just after '?'. 2013-07-03 14:48:37 +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 Add an autoconf option for turning on -gsplit-dwarf by default 2013-06-25 01:12:25 +00:00
Makefile.rules Build with the $RDYNAMIC flag on Darwin as well as other platforms. 2013-08-04 22:06:11 +00:00
README.txt test 2013-04-17 05:34:03 +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.