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LLVM backend for 6502
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75d77cd179
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Jingyue Wu 75d77cd179 [MachineSink] Use the real post dominator tree 
Summary:
Fixes a FIXME in MachineSinking. Instead of using the simple heuristics in
isPostDominatedBy, use the real MachinePostDominatorTree and MachineLoopInfo.
The old heuristics caused instructions to sink unnecessarily, and might create
register pressure.

This is the second try of the fix. The first one (D4814) caused a performance
regression due to failing to sink instructions out of loops (PR21115). This
patch fixes PR21115 by sinking an instruction from a deeper loop to a shallower
one regardless of whether the target block post-dominates the source.

Thanks Alexey Volkov for reporting PR21115! 

Test Plan:
Added a NVPTX codegen test to verify that our change prevents the backend from
over-sinking. It also shows the unnecessary register pressure caused by
over-sinking.

Added an X86 test to verify we can sink instructions out of loops regardless of
the dominance relationship. This test is reduced from Alexey's test in PR21115.

Updated an affected test in X86.

Also ran SPEC CINT2006 and llvm-test-suite for compilation time and runtime
performance. Results are attached separately in the review thread.

Reviewers: Jiangning, resistor, hfinkel

Reviewed By: hfinkel

Subscribers: hfinkel, bruno, volkalexey, llvm-commits, meheff, eliben, jholewinski

Differential Revision: http://reviews.llvm.org/D5633

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219773 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-15 03:27:43 +00:00
autoconf Recognize aarch64_be as valid architecture. 2014-10-06 23:05:04 +00:00
bindings Reinstate "Nuke the old JIT." 2014-09-02 22:28:02 +00:00
cmake Re-land r219354: Use llvm-symbolizer to symbolize LLVM/Clang crash dumps. 2014-10-10 22:06:59 +00:00
docs Introduce Go coding standards for LLVM. 2014-10-14 00:40:53 +00:00
examples Add doInitialization/doFinalization to DataLayoutPass. 2014-09-10 21:27:43 +00:00
include [AAarch64] Optimize CSINC-branch sequence 2014-10-14 23:07:53 +00:00
lib [MachineSink] Use the real post dominator tree 2014-10-15 03:27:43 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test [MachineSink] Use the real post dominator tree 2014-10-15 03:27:43 +00:00
tools [llvm-objdump] Update error message and add test case for mach-o file with bad library ordinals 2014-10-14 23:29:38 +00:00
unittests [ADT] Add an (ADL-friendly) abs free function for APFloat that returns 2014-10-10 08:27:22 +00:00
utils [AVX512] Extended avx512_binop_rm for AVX512VL subsets. 2014-10-09 08:38:48 +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 Add .clang-tidy configuration file to provide LLVM-optimized defaults for 2014-09-08 13:30:00 +00:00
.gitignore
CMakeLists.txt Add LLVM_ENABLE_MODULES flag to CMake to enable building with C++ modules. 2014-09-26 22:40:15 +00:00
CODE_OWNERS.TXT Add Tom Stellard's role as 3.5 release manager. 2014-09-12 08:07:31 +00:00
configure Remove unused ALL_BINDINGS configuration variable. 2014-10-03 23:03:01 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile
Makefile.common
Makefile.config.in Remove unused ALL_BINDINGS configuration variable. 2014-10-03 23:03:01 +00:00
Makefile.rules Revert my earlier change to add "all" as a dependency to check. In 2014-09-19 18:44:27 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
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Please see the documentation provided in docs/ for further
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