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
..
BBVectorize.cpp	BBVectorize: Better use of TTI->getShuffleCost	2013-01-27 20:07:01 +00:00
CMakeLists.txt	Add a loop vectorizer.	2012-10-17 18:25:06 +00:00
LLVMBuild.txt
LoopVectorize.cpp	LoopVectorize: Refactor the code that vectorizes loads/stores to remove duplication.	2013-01-25 21:47:42 +00:00
Makefile
Vectorize.cpp	LoopVectorizer: Use the "optsize" attribute to decide if we are allowed to increase the function size.	2012-12-12 19:29:45 +00:00