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author	Simon Pilgrim <llvm-dev@redking.me.uk>
	Sat, 19 Oct 2019 13:18:02 +0000 (13:18 +0000)
committer	Simon Pilgrim <llvm-dev@redking.me.uk>
	Sat, 19 Oct 2019 13:18:02 +0000 (13:18 +0000)
commit	b5088aa9442fb610f452c5a6c93c1964962c4159
tree	f1342d431621b363a94f67af399005936e90d5d5	tree \| snapshot
parent	6ada70d1b55b9efb8b0603575a0b86e14f049553	commit \| diff

[X86][SSE] lowerV16I8Shuffle - tryToWidenViaDuplication - undef unpack args

tryToWidenViaDuplication lowers using the shuffle_v8i16(unpack_v16i8(shuffle_v8i16(x),shuffle_v8i16(x))) pattern, but the unpack only needs the even/odd 16i8 args if the original v16i8 shuffle mask references the even/odd elements - which isn't true for many extension style shuffles.

llvm-svn: 375342

Domain: System / Toolchain;

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llvm/lib/Target/X86/X86ISelLowering.cpp		diff \| blob \| history
llvm/test/CodeGen/X86/bitcast-and-setcc-128.ll		diff \| blob \| history
llvm/test/CodeGen/X86/bitcast-setcc-128.ll		diff \| blob \| history
llvm/test/CodeGen/X86/vec_int_to_fp.ll		diff \| blob \| history
llvm/test/CodeGen/X86/vector-reduce-mul.ll		diff \| blob \| history
llvm/test/CodeGen/X86/vector-sext.ll		diff \| blob \| history
llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll		diff \| blob \| history
llvm/test/CodeGen/X86/widen_conv-3.ll		diff \| blob \| history