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LLVM backend for 6502
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6969fd1c60
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Bruno Cardoso Lopes 6969fd1c60 [PeepholeOptimizer] Look through PHIs to find additional register sources 
Reapply 243271 with more fixes; although we are not handling multiple
sources with coalescable copies, we were not properly skipping this
case.

- 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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243486 91177308-0d34-0410-b5e6-96231b3b80d8
2015-07-28 21:45:50 +00:00
autoconf Update the trunk version to 3.8.0svn. 2015-07-14 22:35:57 +00:00
bindings Fix llvm-config to emit the linker flag for the combined shared object built by autoconfig/make instead of the individual components. 2015-07-27 18:26:30 +00:00
cmake Use a specified list of languages in cmake project() command. 2015-07-28 14:43:53 +00:00
docs Implement target independent TLS compatible with glibc's emutls.c. 2015-07-28 16:24:05 +00:00
examples DI/Verifier: Fix argument bitrot in DILocalVariable 2015-07-24 23:59:25 +00:00
include [PeepholeOptimizer] Look through PHIs to find additional register sources 2015-07-28 21:45:50 +00:00
lib [PeepholeOptimizer] Look through PHIs to find additional register sources 2015-07-28 21:45:50 +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 [PeepholeOptimizer] Look through PHIs to find additional register sources 2015-07-28 21:45:50 +00:00
tools [RuntimeDyld] Remove a memory-leak that was introduced in r243456. Thanks to Ben 2015-07-28 20:51:53 +00:00
unittests IR: Expose the method 'getLocalSlot' in the module slot tracker. 2015-07-27 22:31:04 +00:00
utils test-release.sh: Defer test errors until the end 2015-07-24 16:16:09 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.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 Use a specified list of languages in cmake project() command. 2015-07-28 14:43:53 +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 [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
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

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