Fix -Wsign-compare warnings on Windows

These arise because enums are 'int' by default.

llvm-svn: 321887

llvm/include/llvm/BinaryFormat/Dwarf.h

@@ -125,7 +125,7 @@ enum LocationAtom {
   DW_OP_LLVM_fragment = 0x1000 ///< Only used in LLVM metadata.
 };
 
-enum TypeKind {
+enum TypeKind : uint8_t {
 #define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR) DW_ATE_##NAME = ID,
 #include "llvm/BinaryFormat/Dwarf.def"
   DW_ATE_lo_user = 0x80,

llvm/include/llvm/IR/LLVMContext.h

@@ -76,7 +76,7 @@ public:
 
   // Pinned metadata names, which always have the same value.  This is a
   // compile-time performance optimization, not a correctness optimization.
-  enum {
+  enum : unsigned {
     MD_dbg = 0,                       // "dbg"
     MD_tbaa = 1,                      // "tbaa"
     MD_prof = 2,                      // "prof"
@@ -108,7 +108,7 @@ public:
   /// operand bundle tags that LLVM has special knowledge of are listed here.
   /// Additionally, this scheme allows LLVM to efficiently check for specific
   /// operand bundle tags without comparing strings.
-  enum {
+  enum : unsigned {
     OB_deopt = 0,         // "deopt"
     OB_funclet = 1,       // "funclet"
     OB_gc_transition = 2, // "gc-transition"

llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp

@@ -277,7 +277,7 @@ int AArch64TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
       // same as the second operand. In this case, we will generate a "long"
       // version of the widening instruction.
       if (auto *Cast = dyn_cast<CastInst>(SingleUser->getOperand(1)))
-        if (I->getOpcode() == Cast->getOpcode() &&
+        if (I->getOpcode() == unsigned(Cast->getOpcode()) &&
             cast<CastInst>(I)->getSrcTy() == Cast->getSrcTy())
           return 0;
     }

llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp

@@ -6250,7 +6250,8 @@ bool ARMAsmParser::validateInstruction(MCInst &Inst,
     // The instruction must be predicable.
     if (!MCID.isPredicable())
       return Error(Loc, "instructions in IT block must be predicable");
-    unsigned Cond = Inst.getOperand(MCID.findFirstPredOperandIdx()).getImm();
+    ARMCC::CondCodes Cond = ARMCC::CondCodes(
+        Inst.getOperand(MCID.findFirstPredOperandIdx()).getImm());
     if (Cond != currentITCond()) {
       // Find the condition code Operand to get its SMLoc information.
       SMLoc CondLoc;
@@ -6258,9 +6259,9 @@ bool ARMAsmParser::validateInstruction(MCInst &Inst,
         if (static_cast<ARMOperand &>(*Operands[I]).isCondCode())
           CondLoc = Operands[I]->getStartLoc();
       return Error(CondLoc, "incorrect condition in IT block; got '" +
-                   StringRef(ARMCondCodeToString(ARMCC::CondCodes(Cond))) +
-                   "', but expected '" +
-                   ARMCondCodeToString(ARMCC::CondCodes(currentITCond())) + "'");
+                                StringRef(ARMCondCodeToString(Cond)) +
+                                "', but expected '" +
+                                ARMCondCodeToString(currentITCond()) + "'");
     }
   // Check for non-'al' condition codes outside of the IT block.
   } else if (isThumbTwo() && MCID.isPredicable() &&