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This patch covered 2 more scenarios: 1. Two operands of shuffle_vector are the same, like %shuffle.i = shufflevector <8 x i8> %a, <8 x i8> %a, <8 x i32> <i32 0, i32 2, i32 4, i32 6, i32 8, i32 10, i32 12, i32 14> 2. One of operands is undef, like %shuffle.i = shufflevector <8 x i8> %a, <8 x i8> undef, <8 x i32> <i32 0, i32 2, i32 4, i32 6, i32 8, i32 10, i32 12, i32 14> After this patch, perm instructions will have chance to be emitted instead of lots of INS. llvm-svn: 199069 |
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