Extract LaneBitmask into a separate type

Specifically avoid implicit conversions from/to integral types to
avoid potential errors when changing the underlying type. For example,
a typical initialization of a "full" mask was "LaneMask = ~0u", which
would result in a value of 0x00000000FFFFFFFF if the type was extended
to uint64_t.

Differential Revision: https://reviews.llvm.org/D27454

llvm-svn: 289820

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/RegisterScavenging.cpp b/llvm/lib/CodeGen/RegisterScavenging.cpp
index be568612e6c..ef8d1891e1d 100644
--- a/llvm/lib/CodeGen/RegisterScavenging.cpp
+++ b/llvm/lib/CodeGen/RegisterScavenging.cpp
@@ -34,7 +34,7 @@ using namespace llvm;
 void RegScavenger::setRegUsed(unsigned Reg, LaneBitmask LaneMask) {
   for (MCRegUnitMaskIterator RUI(Reg, TRI); RUI.isValid(); ++RUI) {
     LaneBitmask UnitMask = (*RUI).second;
-    if (UnitMask == 0 || (LaneMask & UnitMask) != 0)
+    if (UnitMask.none() || !(LaneMask & UnitMask).none())
       RegUnitsAvailable.reset((*RUI).first);
   }
 }