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[Power9] Disable removing extra swaps on P9. 

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.

Commiting on behalf of Stefan Pintilie.
Differential Revision: https://reviews.llvm.org/D34627

llvm-svn: 307185
This commit is contained in:
Sean Fertile 2017-07-05 18:37:10 +00:00
parent ac78daf517
commit 3cd1a0368c
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
View File

@ -195,8 +195,10 @@ public:
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;