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LLVM backend for 6502
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Hal Finkel 245b657ab6 BBVectorize: Better use of TTI->getShuffleCost 
When flipping the pair of subvectors that form a vector, if the
vector length is 2, we can use the SK_Reverse shuffle kind to get
more-accurate cost information. Also we can use the SK_ExtractSubvector
shuffle kind to get accurate subvector extraction costs.

The current cost model implementations don't yet seem complex enough
for this to make a difference (thus, there are no test cases with this
commit), but it should help in future.

Depending on how the various targets optimize and combine shuffles in
practice, we might be able to get more-accurate costs by combining the
costs of multiple shuffle kinds. For example, the cost of flipping the
subvector pairs could be modeled as two extractions and two subvector
insertions. These changes, however, should probably be motivated
by specific test cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173621 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-27 20:07:01 +00:00
autoconf Disable Uninitialized Use Warnings for Broken gcc Versions 2013-01-15 18:21:15 +00:00
bindings
cmake [CMake][Lit][unittests] Cleanup in AddLLVM.cmake. 2013-01-27 12:46:53 +00:00
docs Documentation: fix syntax error 2013-01-26 13:30:13 +00:00
examples
include Fix miscompile. Add back the use of the ArrayRef version of the ::get method. 2013-01-27 10:28:39 +00:00
lib BBVectorize: Better use of TTI->getShuffleCost 2013-01-27 20:07:01 +00:00
projects
runtime
test When the legalizer is splitting vector shifts, the result may not have the right shift amount type. 2013-01-27 11:19:11 +00:00
tools Add DIContext::getLineInfoForAddressRange() function and test. This function allows a caller to obtain a table of line information for a function using the function's address and size. 2013-01-26 00:28:05 +00:00
unittests Fix test to not use the AttributeSet's AttributeWithIndex creation method. 2013-01-27 03:39:10 +00:00
utils [CMake][Lit][unittests] Deprecate CMAKE_BUILD_TYPE in each build directory for unittests. 2013-01-27 12:20:50 +00:00
.arcconfig
.gitignore
CMakeLists.txt
CODE_OWNERS.TXT
configure Disable Uninitialized Use Warnings for Broken gcc Versions 2013-01-15 18:21:15 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Introduce llvm::sys::getProcessTriple() function. 2013-01-16 17:27:22 +00:00
Makefile.rules Pass NO_MISSING_FIELD_INITIALIZERS to Compiler Flags 2013-01-18 23:22:52 +00:00
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