[all-commits] [llvm/llvm-project] fb2786: [AMDGPU] SIFoldOperands: Delay foldCopyToVGPROfSca...

[Fabian Ritter via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fb27867bd5a04975516b099681587ea32f38f3d4
      https://github.com/llvm/llvm-project/commit/fb27867bd5a04975516b099681587ea32f38f3d4
  Author: Fabian Ritter <fabian.ritter at amd.com>
  Date:   2025-05-27 (Tue, 27 May 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    M llvm/test/CodeGen/AMDGPU/flat-scratch-svs.ll

  Log Message:
  -----------
  [AMDGPU] SIFoldOperands: Delay foldCopyToVGPROfScalarAddOfFrameIndex (#141558)

foldCopyToVGPROfScalarAddOfFrameIndex transforms s_adds whose results are copied
to vector registers into v_adds. We don't want to do that if foldInstOperand
(which so far runs later) can fold the sreg->vreg copy away.
This patch therefore delays foldCopyToVGPROfScalarAddOfFrameIndex until after
foldInstOperand.

This avoids unnecessary movs in the flat-scratch-svs.ll test and also avoids
regressions in an upcoming patch to enable ISD::PTRADD nodes.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications