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Matthias Braun 3757169d38 InstCombine: Restrict computeKnownBits() on all Values to OptLevel > 2 
As part of r251146 InstCombine was extended to call computeKnownBits on
every value in the function to determine whether it happens to be
constant. This increases typical compiletime by 1-3% (5% in irgen+opt
time) in my measurements. On the other hand this case did not trigger
once in the whole llvm-testsuite.

This patch introduces the notion of ExpensiveCombines which are only
enabled for OptLevel > 2. I removed the check in InstructionSimplify as
that is called from various places where the OptLevel is not known but
given the rarity of the situation I think a check in InstCombine is
enough.

Differential Revision: http://reviews.llvm.org/D16835

llvm-svn: 263047
2016-03-09 18:47:11 +00:00
bindings Kill LLVMAddTargetData 2016-02-16 00:22:02 +00:00
cmake cmake: include what you use 2016-03-08 18:56:00 +00:00
docs ReleaseNotes: update 'you may prefer' link to 3.8 2016-03-09 17:25:34 +00:00
examples Refactor duplicated code for linking with pthread. 2016-03-01 15:54:40 +00:00
include InstCombine: Restrict computeKnownBits() on all Values to OptLevel > 2 2016-03-09 18:47:11 +00:00
lib InstCombine: Restrict computeKnownBits() on all Values to OptLevel > 2 2016-03-09 18:47:11 +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 InstCombine: Restrict computeKnownBits() on all Values to OptLevel > 2 2016-03-09 18:47:11 +00:00
tools void foo() is not a valid C prototype, one has to write void foo(void) 2016-03-09 02:36:09 +00:00
unittests [AsmParser] Expose an API to parse a string starting with a type. 2016-03-08 00:37:07 +00:00
utils [CodeGen] Add space-optimized EmitMergeInputChains1_2 to the DAG isel matching tables. Shaves about 5100 bytes from the X86 matcher table. NFC 2016-03-07 07:29:12 +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 [CMake] Add test-depends target to build dependencies of check-all 2016-03-02 17:56:30 +00:00
CODE_OWNERS.TXT Add self to CODE_OWNERS 2016-03-08 19:01:15 +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 for a new year. 2015-03-12 01:25:29 +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.