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Mirror of https://github.com/RPCS3/llvm-mirror
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Bruno Cardoso Lopes 3cf14dd30a Look through PHIs to find additional register sources 
- Teaches the ValueTracker in the PeepholeOptimizer to look through PHI
instructions.
- Add findNextSourceAndRewritePHI method to lookup into multiple sources
returnted by the ValueTracker and rewrite PHIs with new sources.

With these changes we can find more register sources and rewrite more
copies to allow coaslescing of bitcast instructions. Hence, we eliminate
unnecessary VR64 <-> GR64 copies in x86, but it could be extended to
other archs by marking "isBitcast" on target specific instructions. The
x86 example follows:

A:
  psllq %mm1, %mm0
  movd  %mm0, %r9
  jmp C

B:
  por %mm1, %mm0
  movd  %mm0, %r9
  jmp C

C:
  movd  %r9, %mm0
  pshufw  $238, %mm0, %mm0

Becomes:

A:
  psllq %mm1, %mm0
  jmp C

B:
  por %mm1, %mm0
  jmp C

C:
  pshufw  $238, %mm0, %mm0

Differential Revision: http://reviews.llvm.org/D11197

rdar://problem/20404526

llvm-svn: 242295
2015-07-15 15:35:23 +00:00
autoconf Update the trunk version to 3.8.0svn. 2015-07-14 22:35:57 +00:00
bindings Expose setPersonalityFn to Go 2015-07-15 13:03:08 +00:00
cmake [CMake] Unbreak add_llvm_external_project when external projects are specified. 2015-07-14 05:12:53 +00:00
docs Fix Sphinx error about duplicate label in CommandLine.rst:1560 and CoverageMappingFormat.rst 2015-07-14 23:29:53 +00:00
examples Simplify the Mangler interface now that DataLayout is mandatory. 2015-06-23 13:59:29 +00:00
include Look through PHIs to find additional register sources 2015-07-15 15:35:23 +00:00
lib Look through PHIs to find additional register sources 2015-07-15 15:35:23 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +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 Look through PHIs to find additional register sources 2015-07-15 15:35:23 +00:00
tools Initial support for writing thin archives. 2015-07-15 05:47:46 +00:00
unittests [ExecutionEngine] Re-apply r241962 with fixes for ARM. 2015-07-14 22:11:10 +00:00
utils [TableGen] Improve decoding options for non-orthogonal instructions 2015-07-15 08:04:27 +00:00
.arcconfig
.clang-format
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +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 Update the trunk version to 3.8.0svn. 2015-07-14 22:35:57 +00:00
CODE_OWNERS.TXT [WebAssembly] Initial WebAssembly backend 2015-06-29 23:51:55 +00:00
configure Update the trunk version to 3.8.0svn. 2015-07-14 22:35:57 +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
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Disallow in-source builds (as we already do for the cmake build). 2015-07-01 18:09:21 +00:00
Makefile.rules Add support for SunOS function/data sections and associated 2015-03-03 20:54:29 +00:00
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +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're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.