commit d6686b6984bdc4f8111947a4471172036a5aea97
author Jessica Paquette <jpaquette@apple.com> Wed Mar 13 21:19:29 2019 +0000
committer Jessica Paquette <jpaquette@apple.com> Wed Mar 13 21:19:29 2019 +0000
tree 9247b00d98dda26b9f6c9e967ae6508f29bbfee7
parent a4638a6a3ae392cbd5100615bc069d88180ab018

[GlobalISel][AArch64] Gardening: Factor out code to find lane indices

Some more refactoring for G_INSERT_VECTOR_ELT.

Factor out the code used to find a lane index from `selectExtractElt`. Put it
into a more general-purpose `getConstantValueForReg` function.

This will be shared with the code for G_INSERT_VECTOR_ELT.

Differential Revision: https://reviews.llvm.org/D59324

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356101 91177308-0d34-0410-b5e6-96231b3b80d8