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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