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Author SHA1 Message Date
Michael Kuperstein
25e34d11f3 [DAGCombine] Produce better code for constant splats 
This solves PR22276.
Splats of constants would sometimes produce redundant shuffles, sometimes ridiculously so (see the PR for details). Fold these shuffles into BUILD_VECTORs early on instead.

Differential Revision: http://reviews.llvm.org/D7093

Fixed recommit of r226811.

llvm-svn: 226816
 2015-01-22 13:07:28 +00:00
Michael Kuperstein
ff74032018 Revert r226811, MSVC accepts code sane compilers don't. 
llvm-svn: 226814
 2015-01-22 12:48:07 +00:00
Michael Kuperstein
84fad3e5c9 [DAGCombine] Produce better code for constant splats 
This solves PR22276.
Splats of constants would sometimes produce redundant shuffles, sometimes ridiculously so (see the PR for details). Fold these shuffles into BUILD_VECTORs early on instead.

Differential Revision: http://reviews.llvm.org/D7093

llvm-svn: 226811
 2015-01-22 12:37:23 +00:00