[PowerPC] Tell VSX swap removal that scalar conversions are lane-sensitive

This is a rather non-controversial change. We were missing these instructions
from the list of instructions that are lane-sensitive. These two put the result
into lane 0 (BE) or 3 (LE) regardless of the input. This patch fixes PR36068.

llvm-svn: 324005

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp b/llvm/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
index 8a5fb9fdaef..3af2ab9cb79 100644
--- a/llvm/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
+++ b/llvm/lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
@@ -519,6 +519,8 @@ bool PPCVSXSwapRemoval::gatherVectorInstructions() {
       // permute control vectors (for shift values 1, 2, 3).  However,
       // VPERM has a more restrictive register class.
       case PPC::XXSLDWI:
+      case PPC::XSCVDPSPN:
+      case PPC::XSCVSPDPN:
         break;
       }
     }