[PATCH] D43297: AMDGPU/SI: Turn off GPR Indexing Mode immediately after the interested instruction.

[Changpeng Fang via Phabricator via llvm-commits]

cfang created this revision.
cfang added reviewers: arsenm, tstellar, kzhuravl.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng.

In the current implementation of GPR Indexing Mode when the index is of non-uniform, the s_set_gpr_idx_off instruction
is incorrectly inserted after the loop. This will lead the instructions with vgpr operands (v_readfirstlane for example) to read incorrect
vgpr.

In this patch, we fix the issue by inserting s_set_gpr_idx_on/off immediately around the interested instruction.


https://reviews.llvm.org/D43297

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  test/CodeGen/AMDGPU/indirect-addressing-si.ll

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