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author	Simon Pilgrim <llvm-dev@redking.me.uk>
	Mon, 3 Jun 2019 13:02:07 +0000 (13:02 +0000)
committer	Simon Pilgrim <llvm-dev@redking.me.uk>
	Mon, 3 Jun 2019 13:02:07 +0000 (13:02 +0000)
commit	2d2b2ea8ca07f4b55052ccd95b1c95e8bcc66096
tree	1472a03eb2bc469110a74875ea9585e57bb01cac	tree \| snapshot
parent	58c0bf12415f91ad6e08be36d60b858ba23eabbe	commit \| diff

[SelectionDAG] Add [us]itofp(undef) --> 0 constant fold (PR39205)

We were missing this fold in the DAG, which I've copied directly from llvm::ConstantFoldCastInstruction

Differential Revision: https://reviews.llvm.org/D62807

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362397 91177308-0d34-0410-b5e6-96231b3b80d8

external/llvm

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lib/CodeGen/SelectionDAG/DAGCombiner.cpp		diff \| blob \| history
lib/CodeGen/SelectionDAG/SelectionDAG.cpp		diff \| blob \| history
test/CodeGen/X86/avx512-cvt-widen.ll		diff \| blob \| history
test/CodeGen/X86/avx512-cvt.ll		diff \| blob \| history
test/CodeGen/X86/vec_int_to_fp-widen.ll		diff \| blob \| history
test/CodeGen/X86/vec_int_to_fp.ll		diff \| blob \| history