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

[Stefan Pintilie via Phabricator via llvm-commits]

stefanp created this revision.

On power 8 we sometimes insert swaps to deal with the difference between Little Endian and Big Endian. The swap removal pass is supposed to clean up these swaps. On power 9 we don't need this pass since we do not need to insert the swaps in the first place.


https://reviews.llvm.org/D34627

Files:
  lib/Target/PowerPC/PPCTargetMachine.cpp


Index: lib/Target/PowerPC/PPCTargetMachine.cpp
===================================================================
--- lib/Target/PowerPC/PPCTargetMachine.cpp
+++ lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -368,6 +368,7 @@
   // For little endian, remove where possible the vector swap instructions
   // introduced at code generation to normalize vector element order.
   if (TM->getTargetTriple().getArch() == Triple::ppc64le &&
+      !TM->getSubtargetImpl()->isISA3_0() &&
       !DisableVSXSwapRemoval)
     addPass(createPPCVSXSwapRemovalPass());
   // Target-specific peephole cleanups performed after instruction


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