tree dbd645bc1c6329c7f233cac3a160e02b71081042
parent f1d8345a2ab3c343929212d1c62174cfaa46e71a
author Christudasan Devadasan <Christudasan.Devadasan@amd.com> 1630901995 -0400
committer Christudasan Devadasan <Christudasan.Devadasan@amd.com> 1638242373 -0500

[AMDGPU] Enable copy between VGPR and AGPR classes during regalloc

Greedy register allocator prefers to move a constrained
live range into a larger allocatable class over spilling
them. This patch defines the necessary superclasses for
vector registers. For subtargets that support copy between
VGPRs and AGPRs, the vector register spills during regalloc
now become just copies.

Reviewed By: rampitec, arsenm

Differential Revision: https://reviews.llvm.org/D109301