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[amdgpu] Add the late codegen preparation pass.

Authored by hliao on May 22 2020, 12:52 PM.

Description

[amdgpu] Add the late codegen preparation pass.

Summary:

  • Teach that pass to widen naturally aligned but not DWORD aligned sub-DWORD loads.

Reviewers: rampitec, arsenm

Subscribers:

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D80364

Details