tree 6d5300e4b5483148013eefef8155d58d3646aa70
parent ab2c9f7c797d71e54387f4900b8a4efd28f3d8f5
author Matt Arsenault <Matthew.Arsenault@amd.com> 1571687626 +0000
committer Matt Arsenault <Matthew.Arsenault@amd.com> 1571687626 +0000

AMDGPU: Erase redundant redefs of m0 in SIFoldOperands

Only handle simple inter-block redefs of m0 to the same value. This
avoids interference from redefs of m0 in SILoadStoreOptimzer. I was
initially teaching that pass to ignore redefs of m0, but having them
not exist beforehand is much simpler.

This is in preparation for deleting the current special m0 handling in
SIFixSGPRCopies to allow the register coalescer to handle the
difficult cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375449 91177308-0d34-0410-b5e6-96231b3b80d8