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Author SHA1 Message Date
Amara Emerson 1abe05c0dd Re-land "[AArch64][GlobalISel] Implement partial support for G_SHUFFLE_VECTOR"" 
Thanks to Richard Trieu for pointing out that the failures were due to a
use-after-free of an ArrayRef.

llvm-svn: 354616
 2019-02-21 20:20:16 +00:00
Amara Emerson 71f2a5e60f Revert "[AArch64][GlobalISel] Implement partial support for G_SHUFFLE_VECTOR" 
This reverts r354521 because it broke the bots, but passes on Darwin somehow.

llvm-svn: 354532
 2019-02-21 00:31:13 +00:00
Amara Emerson 883000d888 [GlobalISel] Add -O0 to some tests to see if it fixes them. I can't reproduce the failures locally, 
and greendragon also passes, but some other bots fail for reasons I don't understand.
The only difference I can see between these tests is it's missing an -O0
If this doesn't work I'll revert and continue investigating.

llvm-svn: 354529
 2019-02-20 23:22:15 +00:00
Amara Emerson a946d057b4 [AArch64][GlobalISel] Implement partial support for G_SHUFFLE_VECTOR 
This change makes some basic type combinations for G_SHUFFLE_VECTOR legal, and
implements them with a very pessimistic TBL2 instruction in the selector.

For TBL2, support is also needed to generate constant pool entries and load from
them in order to materialize the mask register.

Currently supports <2 x s64> and <4 x s32> result types.

Differential Revision: https://reviews.llvm.org/D58466

llvm-svn: 354521
 2019-02-20 22:11:39 +00:00