1 files changed, 0 insertions, 8 deletions
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp
index bf992a1..bf1c0dc 100644
--- a/llvm/lib/CodeGen/VirtRegMap.cpp
+++ b/llvm/lib/CodeGen/VirtRegMap.cpp
@@ -400,14 +400,6 @@ void VirtRegRewriter::rewrite() {
                 MO.setIsUndef(true);
             } else if (!MO.isDead()) {
               assert(MO.isDef());
-              // Things get tricky when we ran out of lane mask bits and
-              // merged multiple lanes into the overflow bit: In this case
-              // our subregister liveness tracking isn't precise and we can't
-              // know what subregister parts are undefined, fall back to the
-              // implicit super-register def then.
-              LaneBitmask LaneMask = TRI->getSubRegIndexLaneMask(SubReg);
-              if (TargetRegisterInfo::isImpreciseLaneMask(LaneMask))
-                SuperDefs.push_back(PhysReg);
             }
           }