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* [AArch64] add more tests for buildvec to shuffle transform; NFCSanjay Patel2019-01-211-0/+419
| | | | | | | | These are copied from the sibling x86 file. I'm not sure which of the current outputs (if any) is considered optimal, but someone more familiar with AArch may want to take a look. llvm-svn: 351754
* [DAGCombiner] fix crash when converting build vector to shuffleSanjay Patel2019-01-211-0/+22
The regression test is reduced from the example shown in D56281. This does raise a question as noted in the test file: do we want to handle this pattern? I don't have a motivating example for that on x86 yet, but it seems like we could have that pattern there too, so we could avoid the back-and-forth using a shuffle. llvm-svn: 351753
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