5 Commits

Author	SHA1	Message	Date
Bruno Cardoso Lopes	6cb23f6e7f	Add a DAGCombine for subvector extracts to remove useless chains of ... subvector inserts and extracts. Initial patch by Rackover, Zvi with some tweak done by me. llvm-svn: 140204	2011-09-20 23:19:33 +00:00
Bruno Cardoso Lopes	8058234b32	Revert r140097, working on a better approach ... llvm-svn: 140203	2011-09-20 23:19:29 +00:00
Bruno Cardoso Lopes	51792dcc4d	Based on the small opt Zvi's patch was trying to achieve, eliminate ... 128-bit undef subvector insertion into a 256-bit vector llvm-svn: 140097	2011-09-19 23:36:50 +00:00
Bruno Cardoso Lopes	cbe7feeab9	Fix PR10656. It's only profitable to use 128-bit inserts and extracts ... when AVX mode is one. Otherwise is just more work for the type legalizer. llvm-svn: 137661	2011-08-15 21:45:54 +00:00
Bruno Cardoso Lopes	8fbf023c9b	Add a dag combine to xform 256-bit shuffles into simple vector ... inserts and extracts. This simple combine makes us generate only 1 instruction instead of 11 in the v8 case. llvm-svn: 137362	2011-08-11 21:50:44 +00:00