5 Commits

Author	SHA1	Message	Date
Simon Pilgrim	687d71e877	[X86][SSE] Add support for combining target shuffles to PSLLDQ/PSRLDQ byte shifts ... llvm-svn: 278502	2016-08-12 11:24:34 +00:00
Simon Pilgrim	85c7ea86ae	[DAGCombine] Avoid INSERT_SUBVECTOR reinsertions (PR28678) ... If the input vector to INSERT_SUBVECTOR is another INSERT_SUBVECTOR, and this inserted subvector replaces the last insertion, then insert into the common source vector. i.e. INSERT_SUBVECTOR( INSERT_SUBVECTOR( Vec, SubOld, Idx ), SubNew, Idx ) --> INSERT_SUBVECTOR( Vec, SubNew, Idx ) Differential Revision: https://reviews.llvm.org/D23330 llvm-svn: 278211	2016-08-10 10:50:53 +00:00
Simon Pilgrim	3b6feeaa7c	[X86][SSE41] Combine vector blends with zero ... Part 2 of 2 This patch add support for combining target shuffles into blends-with-zero. Differential Revision: http://reviews.llvm.org/D17483 llvm-svn: 261745	2016-02-24 15:14:21 +00:00
Simon Pilgrim	dd01f70085	[X86][SSE41] Combine insertion of zero scalars into vector blends with zero ... Part 1 of 2 This patch attempts to replace the insertion of zero scalars with a vector blend with zero, avoiding the use of the integer insertion instructions (which are particularly slow on many targets). (Part 2 will add support for combining multiple blends-with-zero). Differential Revision: http://reviews.llvm.org/D17483 llvm-svn: 261743	2016-02-24 14:53:27 +00:00
Simon Pilgrim	3ac854931f	[X86][SSE] Added tests for insertion of zero elements into vectors ... Many of these could be much better if we just lowered them all as shuffles - especially for the 256-bit vectors. llvm-svn: 256708	2016-01-03 17:33:32 +00:00