[PATCH] D34627: [Power9] Disable removing extra swaps on P9 since it should not be needed.

[Sean Fertile via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL307185: [Power9] Disable removing extra swaps on P9. (authored by sfertile).

Changed prior to commit:
  https://reviews.llvm.org/D34627?vs=104861&id=105314#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D34627

Files:
  llvm/trunk/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp


Index: llvm/trunk/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
===================================================================
--- llvm/trunk/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
+++ llvm/trunk/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
@@ -195,8 +195,10 @@
       return false;
 
     // If we don't have VSX on the subtarget, don't do anything.
+    // Also, on Power 9 the load and store ops preserve element order and so
+    // the swaps are not required.
     const PPCSubtarget &STI = MF.getSubtarget<PPCSubtarget>();
-    if (!STI.hasVSX())
+    if (!STI.hasVSX() || !STI.needsSwapsForVSXMemOps())
       return false;
 
     bool Changed = false;


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