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8bb12b9f5e
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Guozhi Wei 8bb12b9f5e [PPC] Shorter sequence to load 64bit constant with same hi/lo words 
This is a patch to implement pr30640.

When a 64bit constant has the same hi/lo words, we can use rldimi to copy the low word into high word of the same register.

This optimization caused failure of test case bperm.ll because of not optimal heuristic in function SelectAndParts64. It chooses AND or ROTATE to extract bit groups from a register, and OR them together. This optimization lowers the cost of loading 64bit constant mask used in AND method, and causes different code sequence. But actually ROTATE method is better in this test case. The reason is in ROTATE method the final OR operation can be avoided since rldimi can insert the rotated bits into target register directly. So this patch also enhances SelectAndParts64 to prefer ROTATE method when the two methods have same cost and there are multiple bit groups need to be ORed together.

Differential Revision: https://reviews.llvm.org/D25521



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284276 91177308-0d34-0410-b5e6-96231b3b80d8
2016-10-14 20:41:50 +00:00
bindings cmake: Install the OCaml libraries into a more correct path 2016-09-30 18:34:23 +00:00
cmake [cmake] Make LIT_COMMAND configurable and improve fallback support 2016-10-04 20:25:37 +00:00
docs [docs] Update some obsolete information in BitCodeFormat docs. 2016-10-14 16:23:09 +00:00
examples [Kaleidoscope] Make Chapter 2 use llvm::make_unique, rather than a helper. 2016-09-19 23:00:27 +00:00
include TargetLowering: Add SimplifyDemandedBits() helper to TargetLoweringOpt 2016-10-14 19:14:26 +00:00
lib [PPC] Shorter sequence to load 64bit constant with same hi/lo words 2016-10-14 20:41:50 +00:00
projects [CMake] Correct configuration order of the sub-projects based on ther dependancies 2016-10-09 20:38:29 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Fixing lit for runtimes directory 2016-09-15 06:14:13 +00:00
test [PPC] Shorter sequence to load 64bit constant with same hi/lo words 2016-10-14 20:41:50 +00:00
tools [Coverage] Delete some copy constructors (NFC) 2016-10-12 22:27:49 +00:00
unittests [Coverage] Support loading multiple binaries into a CoverageMapping 2016-10-14 17:16:53 +00:00
utils vim: add norecurse attribute 2016-10-14 19:48:34 +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 Code editor files 2016-09-02 22:54:26 +00:00
CMakeLists.txt [cmake] Treat polly as "in tree" if LLVM_EXTERNAL_POLLY_SOURCE_DIR is provided 2016-10-07 21:32:47 +00:00
CODE_OWNERS.TXT Take ownership of libLTO as discussed on llvm-dev. 2016-09-15 17:42:39 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT Remove autoconf references from LICENSE.TXT 2016-08-12 20:11:03 +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
README.txt Revert rL277454 2016-08-02 13:26:07 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +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.