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, 2 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/TargetRegisterInfo.cpp b/llvm/lib/CodeGen/TargetRegisterInfo.cpp
index 89c407de472..cd50c5b6571 100644
--- a/llvm/lib/CodeGen/TargetRegisterInfo.cpp
+++ b/llvm/lib/CodeGen/TargetRegisterInfo.cpp
@@ -30,8 +30,8 @@ using namespace llvm;
 TargetRegisterInfo::TargetRegisterInfo(const TargetRegisterInfoDesc *ID,
                              regclass_iterator RCB, regclass_iterator RCE,
                              const char *const *SRINames,
-                             const unsigned *SRILaneMasks,
-                             unsigned SRICoveringLanes)
+                             const LaneBitmask *SRILaneMasks,
+                             LaneBitmask SRICoveringLanes)
   : InfoDesc(ID), SubRegIndexNames(SRINames),
     SubRegIndexLaneMasks(SRILaneMasks),
     RegClassBegin(RCB), RegClassEnd(RCE),
@@ -127,12 +127,6 @@ Printable PrintVRegOrUnit(unsigned Unit, const TargetRegisterInfo *TRI) {
   });
 }
 
-Printable PrintLaneMask(LaneBitmask LaneMask) {
-  return Printable([LaneMask](raw_ostream &OS) {
-    OS << format("%08X", LaneMask);
-  });
-}
-
 } // End of llvm namespace
 
 /// getAllocatableClass - Return the maximal subclass of the given register