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/LiveRegMatrix.cpp b/llvm/lib/CodeGen/LiveRegMatrix.cpp
index 088a92d162b..6de139dd66e 100644
--- a/llvm/lib/CodeGen/LiveRegMatrix.cpp
+++ b/llvm/lib/CodeGen/LiveRegMatrix.cpp
@@ -79,7 +79,7 @@ static bool foreachUnit(const TargetRegisterInfo *TRI,
       unsigned Unit = (*Units).first;
       LaneBitmask Mask = (*Units).second;
       for (LiveInterval::SubRange &S : VRegInterval.subranges()) {
-        if (S.LaneMask & Mask) {
+        if (!(S.LaneMask & Mask).none()) {
           if (Func(Unit, S))
             return true;
           break;