RPCSX/llvm
1
0
Fork 0
mirror of https://github.com/RPCSX/llvm.git synced 2024-12-22 20:18:38 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
Mirror of official llvm git repository located at http://llvm.org/git/llvm. Updated every five minutes.
147,783 Commits 27 Branches 0 Tags 473 MiB
LLVM 46.9%
C++ 42.5%
Assembly 8.9%
C 0.6%
Python 0.4%
Other 0.5%
e35a5f5518
Go to file
Wei Mi e35a5f5518 [SCEV] Add a local cache for getZeroExtendExpr and getSignExtendExpr to prevent 
the exponential behavior.

The patch is to fix PR32043. Functions getZeroExtendExpr and getSignExtendExpr
may call themselves recursively more than once. This is potentially a 2^N
complexity behavior. The exponential behavior was not commonly exposed before
because of existing global cache mechnism like UniqueSCEVs or some early return
mechanism when flags FlagNSW or FlagNUW are seen. However, we still have case
which can expose the exponential behavior, like the case in PR32043, so we add
a local cache in getZeroExtendExpr and getSignExtendExpr. If the input of the
functions -- SCEV and type pair have been seen before, we can find the extended
expression directly in the local cache.

Differential Revision: https://reviews.llvm.org/D30350


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300494 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-17 20:40:05 +00:00
bindings Introducing LLVMMetadataRef 2017-04-17 11:52:54 +00:00
cmake Reverting cmake/modules/AddLLVM.cmake changes from revision 300184 (Added by mistake). 2017-04-13 09:26:49 +00:00
docs Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
examples Module::getOrInsertFunction is using C-style vararg instead of variadic templates. 2017-04-11 15:01:18 +00:00
include [SCEV] Add a local cache for getZeroExtendExpr and getSignExtendExpr to prevent 2017-04-17 20:40:05 +00:00
lib [SCEV] Add a local cache for getZeroExtendExpr and getSignExtendExpr to prevent 2017-04-17 20:40:05 +00:00
projects [cmake] Include openmp with add_llvm_external_project 2017-03-07 18:54:17 +00:00
resources
runtimes [CMake][runtimes] Use -nodefaultlibs for the runtimes build 2017-04-13 21:29:03 +00:00
test [InstSimplify] add/move tests for (icmp X, C1 & icmp X, C2); NFC 2017-04-17 20:38:33 +00:00
tools Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
unittests [SCEV] Add a local cache for getZeroExtendExpr and getSignExtendExpr to prevent 2017-04-17 20:40:05 +00:00
utils build_llvm_package.bat: Move to VS2017 2017-04-13 23:13:23 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [CMake] Provide an option to disable runtimes build 2017-03-23 22:40:10 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
configure
CREDITS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. Added a blank line. 2017-03-06 20:45:33 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +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.