granicus.if.org Git - llvm/commit

]> granicus.if.org Git - llvm/commit

author	Simon Pilgrim <llvm-dev@redking.me.uk>
	Tue, 15 Jan 2019 16:56:55 +0000 (16:56 +0000)
committer	Simon Pilgrim <llvm-dev@redking.me.uk>
	Tue, 15 Jan 2019 16:56:55 +0000 (16:56 +0000)
commit	b8f7485f8717a784a7d84f7111ebfb76fecb4320
tree	20f8f81b544ec808d33a94a2e3b658125d2d1d99	tree \| snapshot
parent	a9ba146cfa7515290fbe7c46c3a28c73473f0cc2	commit \| diff

[X86] Bailout of lowerVectorShuffleAsPermuteAndUnpack for shuffle-with-zero (PR40306)

If we're shuffling with a zero vector, then we are better off not doing VECTOR_SHUFFLE(UNPCK()) as we lose track of those zero elements.

We were already doing this for SSSE3 targets as we have PSHUFB, but its worth doing for all targets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351203 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelLowering.cpp		diff \| blob \| history
test/CodeGen/X86/buildvec-extract.ll		diff \| blob \| history
test/CodeGen/X86/vector-shuffle-128-v8.ll		diff \| blob \| history

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