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3 Commits

Author SHA1 Message Date
Michael Kuperstein
a52ddfa930 [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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226816 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-01-22 13:07:28 +00:00
Michael Kuperstein
8fc1c3a619 Revert r226811, MSVC accepts code sane compilers don't. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226814 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-01-22 12:48:07 +00:00
Michael Kuperstein
0a979a09ae [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226811 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-01-22 12:37:23 +00:00