[all-commits] [llvm/llvm-project] a065a0: [AMDGPU] Allow use of StackPtrOffsetReg when build...

[Carl Ritson via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a065a01bf715e4a5cf1b532ea50a4a6d877eeed7
      https://github.com/llvm/llvm-project/commit/a065a01bf715e4a5cf1b532ea50a4a6d877eeed7
  Author: Carl Ritson <carl.ritson at amd.com>
  Date:   2020-05-16 (Sat, 16 May 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/test/CodeGen/AMDGPU/spill-scavenge-offset.ll

  Log Message:
  -----------
  [AMDGPU] Allow use of StackPtrOffsetReg when building spills

Summary:
When spilling in the entry function we should be able to borrow
StackPtrOffsetReg as a last resort.  This restores behaviour
removed in D75138, and fixes failures when shaders use all
SGPRs, VGPRs and spill in the entry function.

Reviewers: scott.linder, arsenm, tpr

Reviewed By: scott.linder, arsenm

Subscribers: qcolombet, foad, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, t-tye, hiraditya, kerbowa, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D79776