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[PowerPC] Fix for compiler side issue in PCRelative Local Exec

Authored by stefanp on Sep 21 2020, 9:28 AM.



Stop combining loads and stores with PPCISD::ADD_TLS before we can merge the
node with with TLS_LOCAL_EXEC_MAT_ADDR. The issue is that
TLS_LOCAL_EXEC_MAT_ADDR cannot be selected by itself and requires the previous
ADD_TLS node that goes with it. However, we sometimes try to combine ADD_TLS
with loads and stores that come after it. If this happens then the ADD_TLS is
removed and TLS_LOCAL_EXEC_MAT_ADDR cannot be selected.

While this bug fix will address the issue it my not be ideal from a performance
perspective as we may be able to add patterns to combine TLS_LOCAL_EXEC_MAT_ADDR
with ADD_TLS with the load and store that comes after it all in one. However,
this is beyond the scope of this patch.

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Event Timeline

stefanp created this revision.Sep 21 2020, 9:28 AM
Herald added a project: Restricted Project. · View Herald TranscriptSep 21 2020, 9:28 AM
stefanp requested review of this revision.Sep 21 2020, 9:28 AM
stefanp added reviewers: NeHuang, sfertile, Restricted Project.Sep 21 2020, 9:29 AM
NeHuang accepted this revision as: NeHuang.Sep 21 2020, 1:36 PM


This revision is now accepted and ready to land.Sep 21 2020, 1:36 PM