Kevin Qin 5c8b8e61df [AArch64 NEON] Add more scenarios to use perm instructions when lowering shuffle_vector
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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199069 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-13 01:56:29 +00:00
..
2014-01-11 21:06:00 +00:00
2014-01-11 21:06:00 +00:00
2014-01-11 21:06:00 +00:00
2014-01-11 21:06:00 +00:00
2014-01-11 21:06:00 +00:00
2014-01-12 15:57:38 +00:00
2014-01-11 21:06:00 +00:00