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[DAGCombiner] Simplify shuffle mask index if the referenced input element is UNDEF
authorSimon Pilgrim <llvm-dev@redking.me.uk>
Tue, 8 Aug 2017 11:03:30 +0000 (11:03 +0000)
committerSimon Pilgrim <llvm-dev@redking.me.uk>
Tue, 8 Aug 2017 11:03:30 +0000 (11:03 +0000)
commitef44228acba499cba328ad7ce399be21462e584c
tree79b6a156ed74bec150568b59e89f59b4763521edtree | snapshot
parent055400469847495627c783c597c35253a00ad128commit | diff
[DAGCombiner] Simplify shuffle mask index if the referenced input element is UNDEF

Fixes one of the cases in PR34041.

Differential Revision: https://reviews.llvm.org/D36393

llvm-svn: 310344
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp diff | blob | history
llvm/test/CodeGen/X86/avx-vbroadcast.ll diff | blob | history
Domain: System / Toolchain;