From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 9 Nov 2010 22:44:22 +0000 (+0000)
Subject: Two types of instructions have register lists:
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7729e06c128be01fc564870d5ea3d22d236dddb5;p=oota-llvm.git

Two types of instructions have register lists:

* LDM, et al, uses a bit mask to indicate the register list.
* VLDM, et al, uses a base register plus number.

The LDM instructions may be non-contiguous, but the VLDM ones must be
contiguous. Those are semantic checks that should be done later in the
compiler. Also postpone the creation of the bit mask until it's needed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118640 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 71fa27cb46f..8ae5e03d261 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -128,8 +128,7 @@ class ARMOperand : public MCParsedAsmOperand {
     } Reg;
 
     struct {
-      unsigned RegStart;
-      unsigned Number;
+      std::vector<unsigned> *Registers;
     } RegList;
 
     struct {
@@ -196,18 +195,13 @@ public:
   }
 
   unsigned getReg() const {
-    assert((Kind == Register || Kind == RegisterList) && "Invalid access!");
-    unsigned RegNum = 0;
-    if (Kind == Register)
-      RegNum = Reg.RegNum;
-    else
-      RegNum = RegList.RegStart;
-    return RegNum;
+    assert(Kind == Register && "Invalid access!");
+    return Reg.RegNum;
   }
 
-  std::pair<unsigned, unsigned> getRegList() const {
+  const std::vector<unsigned> &getRegList() const {
     assert(Kind == RegisterList && "Invalid access!");
-    return std::make_pair(RegList.RegStart, RegList.Number);
+    return *RegList.Registers;
   }
 
   const MCExpr *getImm() const {
@@ -259,10 +253,11 @@ public:
   }
 
   void addRegListOperands(MCInst &Inst, unsigned N) const {
-    assert(N == 2 && "Invalid number of operands!");
-    std::pair<unsigned, unsigned> RegList = getRegList();
-    Inst.addOperand(MCOperand::CreateReg(RegList.first));
-    Inst.addOperand(MCOperand::CreateImm(RegList.second));
+    assert(N == 1 && "Invalid number of operands!");
+    const std::vector<unsigned> &RegList = getRegList();
+    for (std::vector<unsigned>::const_iterator
+           I = RegList.begin(), E = RegList.end(); I != E; ++I)
+      Inst.addOperand(MCOperand::CreateReg(*I));
   }
 
   void addImmOperands(MCInst &Inst, unsigned N) const {
@@ -325,11 +320,15 @@ public:
     return Op;
   }
 
-  static ARMOperand *CreateRegList(unsigned RegStart, unsigned Number,
-                                   SMLoc S, SMLoc E) {
+  static ARMOperand *
+  CreateRegList(std::vector<std::pair<unsigned, SMLoc> > &Regs,
+                SMLoc S, SMLoc E) {
     ARMOperand *Op = new ARMOperand(RegisterList);
-    Op->RegList.RegStart = RegStart;
-    Op->RegList.Number = Number;
+    Op->RegList.Registers = new std::vector<unsigned>();
+    for (std::vector<std::pair<unsigned, SMLoc> >::iterator
+           I = Regs.begin(), E = Regs.end(); I != E; ++I)
+      Op->RegList.Registers->push_back(I->first);
+    std::sort(Op->RegList.Registers->begin(), Op->RegList.Registers->end());
     Op->StartLoc = S;
     Op->EndLoc = E;
     return Op;
@@ -386,12 +385,12 @@ void ARMOperand::dump(raw_ostream &OS) const {
     break;
   case RegisterList: {
     OS << "<register_list ";
-    std::pair<unsigned, unsigned> List = getRegList();
-    unsigned RegEnd = List.first + List.second;
 
-    for (unsigned Idx = List.first; Idx < RegEnd; ) {
-      OS << Idx;
-      if (++Idx < RegEnd) OS << ", ";
+    const std::vector<unsigned> &RegList = getRegList();
+    for (std::vector<unsigned>::const_iterator
+           I = RegList.begin(), E = RegList.end(); I != E; ) {
+      OS << *I;
+      if (++I < E) OS << ", ";
     }
 
     OS << ">";
@@ -459,30 +458,15 @@ ARMOperand *ARMAsmParser::ParseRegisterList() {
   assert(Parser.getTok().is(AsmToken::LCurly) &&
          "Token is not a Left Curly Brace");
   SMLoc S = Parser.getTok().getLoc();
-  Parser.Lex(); // Eat left curly brace token.
-
-  const AsmToken &RegTok = Parser.getTok();
-  SMLoc RegLoc = RegTok.getLoc();
-  if (RegTok.isNot(AsmToken::Identifier)) {
-    Error(RegLoc, "register expected");
-    return 0;
-  }
-
-  int RegNum = TryParseRegister();
-  if (RegNum == -1) {
-    Error(RegLoc, "register expected");
-    return 0;
-  }
 
-  unsigned PrevRegNum = RegNum;
+  // Read the rest of the registers in the list.
+  unsigned PrevRegNum = 0;
   std::vector<std::pair<unsigned, SMLoc> > Registers;
   Registers.reserve(32);
-  Registers.push_back(std::make_pair(RegNum, RegLoc));
 
-  while (Parser.getTok().is(AsmToken::Comma) ||
-         Parser.getTok().is(AsmToken::Minus)) {
+  do {
     bool IsRange = Parser.getTok().is(AsmToken::Minus);
-    Parser.Lex(); // Eat comma or minus token.
+    Parser.Lex(); // Eat non-identifier token.
 
     const AsmToken &RegTok = Parser.getTok();
     SMLoc RegLoc = RegTok.getLoc();
@@ -508,7 +492,8 @@ ARMOperand *ARMAsmParser::ParseRegisterList() {
     }
 
     PrevRegNum = RegNum;
-  }
+  } while (Parser.getTok().is(AsmToken::Comma) ||
+           Parser.getTok().is(AsmToken::Minus));
 
   // Process the right curly brace of the list.
   const AsmToken &RCurlyTok = Parser.getTok();
@@ -521,18 +506,15 @@ ARMOperand *ARMAsmParser::ParseRegisterList() {
   Parser.Lex(); // Eat right curly brace token.
  
   // Verify the register list.
-  std::vector<std::pair<unsigned, SMLoc> >::iterator
+  std::vector<std::pair<unsigned, SMLoc> >::const_iterator
     RI = Registers.begin(), RE = Registers.end();
 
-  unsigned Number = Registers.size();
   unsigned HighRegNum = RI->first;
-  unsigned RegStart = RI->first;
-
   DenseMap<unsigned, bool> RegMap;
   RegMap[RI->first] = true;
 
   for (++RI; RI != RE; ++RI) {
-    std::pair<unsigned, SMLoc> &RegInfo = *RI;
+    const std::pair<unsigned, SMLoc> &RegInfo = *RI;
 
     if (RegMap[RegInfo.first]) {
       Error(RegInfo.second, "register duplicated in register list");
@@ -545,15 +527,9 @@ ARMOperand *ARMAsmParser::ParseRegisterList() {
 
     RegMap[RegInfo.first] = true;
     HighRegNum = std::max(RegInfo.first, HighRegNum);
-    RegStart = std::min(RegInfo.first, RegStart);
-  }
-
-  if (RegStart + Number - 1 != HighRegNum) {
-    Error(RegLoc, "non-contiguous register range");
-    return 0;
   }
 
-  return ARMOperand::CreateRegList(RegStart, Number, S, E);
+  return ARMOperand::CreateRegList(Registers, S, E);
 }
 
 /// Parse an ARM memory expression, return false if successful else return true