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Author SHA1 Message Date
Jessica Paquette 607774c960 Recommit "[GlobalISel][AArch64] Add selection support for G_EXTRACT_VECTOR_ELT" 
After r355865, we should be able to safely select G_EXTRACT_VECTOR_ELT without
running into any problematic intrinsics.

Also add a fix for lane copies, which don't support index 0.

llvm-svn: 355871
 2019-03-11 22:18:01 +00:00
Jessica Paquette 00d5847b5c Revert "[GlobalISel][AArch64] Add selection support for G_EXTRACT_VECTOR_ELT" 
This broke test-suite::aarch64_neon_intrinsics.test

Reverting while I look into it.

Example failure:
http://lab.llvm.org:8011/builders/clang-cmake-aarch64-quick/builds/17740

llvm-svn: 355408
 2019-03-05 15:47:00 +00:00
Jessica Paquette caf62b1d47 [GlobalISel][AArch64] Add selection support for G_EXTRACT_VECTOR_ELT 
This adds instruction selection support for G_EXTRACT_VECTOR_ELT for cases
where the index is defined by a G_CONSTANT.

It also factos out the lane copy opcode selection part into its own function,
`getLaneCopyOpcode`. This is used by both `selectUnmergeValues` and
`selectExtractElt`.

Differential Revision: https://reviews.llvm.org/D58469

llvm-svn: 355344
 2019-03-04 22:35:32 +00:00