[RISCV][NFC] Use NoRegister instead of 0 literal

Summary: Trivial cleanup.

Reviewers: asb, lenary

Reviewed By: lenary

Subscribers: hiraditya, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, MaskRay, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, psnobl, benna, Jim, s.egerton, pzheng, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67526

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372120 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 587725db7ea5b2463db9148b1bd066f8be42ae25..999bc8bdb65525d2266b146793e5ac0ed03e9e09 100644 (file)
--- a/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -986,11 +986,11 @@ bool RISCVAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
 static bool matchRegisterNameHelper(bool IsRV32E, Register &RegNo,
                                     StringRef Name) {
   RegNo = MatchRegisterName(Name);
-  if (RegNo == 0)
+  if (RegNo == NoRegister)
     RegNo = MatchRegisterAltName(Name);
   if (IsRV32E && RegNo >= RISCV::X16 && RegNo <= RISCV::X31)
-    RegNo = 0;
-  return RegNo == 0;
+    RegNo = NoRegister;
+  return RegNo == NoRegister;
 }
 
 bool RISCVAsmParser::ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
@@ -1036,7 +1036,7 @@ OperandMatchResultTy RISCVAsmParser::parseRegister(OperandVector &Operands,
     Register RegNo;
     matchRegisterNameHelper(isRV32E(), RegNo, Name);
 
-    if (RegNo == 0) {
+    if (RegNo == NoRegister) {
       if (HadParens)
         getLexer().UnLex(LParen);
       return MatchOperand_NoMatch;