1 //===-- PPCInstPrinter.cpp - Convert PPC MCInst to assembly syntax --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class prints an PPC MCInst to a .s file.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "asm-printer"
15 #include "PPCInstPrinter.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCInst.h"
18 //#include "llvm/MC/MCAsmInfo.h"
19 //#include "llvm/ADT/StringExtras.h"
20 #include "llvm/Support/raw_ostream.h"
22 #include "PPCGenRegisterNames.inc"
23 #include "PPCGenInstrNames.inc"
26 #define GET_INSTRUCTION_NAME
27 #define PPCAsmPrinter PPCInstPrinter
28 #define MachineInstr MCInst
29 #include "PPCGenAsmWriter.inc"
31 StringRef PPCInstPrinter::getOpcodeName(unsigned Opcode) const {
32 return getInstructionName(Opcode);
36 void PPCInstPrinter::printInst(const MCInst *MI, raw_ostream &O) {
39 printInstruction(MI, O);
42 void PPCInstPrinter::printS5ImmOperand(const MCInst *MI, unsigned OpNo,
44 char Value = MI->getOperand(OpNo).getImm();
45 Value = (Value << (32-5)) >> (32-5);
49 void PPCInstPrinter::printU5ImmOperand(const MCInst *MI, unsigned OpNo,
51 unsigned char Value = MI->getOperand(OpNo).getImm();
52 assert(Value <= 31 && "Invalid u5imm argument!");
53 O << (unsigned int)Value;
56 void PPCInstPrinter::printU6ImmOperand(const MCInst *MI, unsigned OpNo,
58 unsigned char Value = MI->getOperand(OpNo).getImm();
59 assert(Value <= 63 && "Invalid u6imm argument!");
60 O << (unsigned int)Value;
63 void PPCInstPrinter::printS16ImmOperand(const MCInst *MI, unsigned OpNo,
65 O << (short)MI->getOperand(OpNo).getImm();
68 void PPCInstPrinter::printU16ImmOperand(const MCInst *MI, unsigned OpNo,
70 O << (unsigned short)MI->getOperand(OpNo).getImm();
73 void PPCInstPrinter::printS16X4ImmOperand(const MCInst *MI, unsigned OpNo,
75 if (MI->getOperand(OpNo).isImm()) {
76 O << (short)(MI->getOperand(OpNo).getImm()*4);
80 assert(0 && "Unhandled operand");
83 printOp(MI->getOperand(OpNo), O);
84 if (TM.getRelocationModel() == Reloc::PIC_)
85 O << "-\"L" << getFunctionNumber() << "$pb\")";
91 void PPCInstPrinter::printBranchOperand(const MCInst *MI, unsigned OpNo,
93 if (!MI->getOperand(OpNo).isImm())
94 return printOperand(MI, OpNo, O);
96 // Branches can take an immediate operand. This is used by the branch
97 // selection pass to print $+8, an eight byte displacement from the PC.
98 O << "$+" << MI->getOperand(OpNo).getImm()*4;
104 void PPCInstPrinter::printcrbitm(const MCInst *MI, unsigned OpNo,
106 unsigned CCReg = MI->getOperand(OpNo).getReg();
109 default: assert(0 && "Unknown CR register");
110 case PPC::CR0: RegNo = 0; break;
111 case PPC::CR1: RegNo = 1; break;
112 case PPC::CR2: RegNo = 2; break;
113 case PPC::CR3: RegNo = 3; break;
114 case PPC::CR4: RegNo = 4; break;
115 case PPC::CR5: RegNo = 5; break;
116 case PPC::CR6: RegNo = 6; break;
117 case PPC::CR7: RegNo = 7; break;
119 O << (0x80 >> RegNo);
122 void PPCInstPrinter::printMemRegImm(const MCInst *MI, unsigned OpNo,
124 printSymbolLo(MI, OpNo, O);
126 assert(MI->getOperand(OpNo+1).isReg() && "Bad operand");
128 if (MI->getOperand(OpNo+1).isReg() &&
129 MI->getOperand(OpNo+1).getReg() == PPC::R0)
132 printOperand(MI, OpNo+1, O);
136 void PPCInstPrinter::printMemRegImmShifted(const MCInst *MI, unsigned OpNo,
138 if (MI->getOperand(OpNo).isImm())
139 printS16X4ImmOperand(MI, OpNo, O);
141 printSymbolLo(MI, OpNo, O);
144 assert(MI->getOperand(OpNo+1).isReg() && "Bad operand");
146 if (MI->getOperand(OpNo+1).isReg() &&
147 MI->getOperand(OpNo+1).getReg() == PPC::R0)
150 printOperand(MI, OpNo+1, O);
155 void PPCInstPrinter::printMemRegReg(const MCInst *MI, unsigned OpNo,
157 // When used as the base register, r0 reads constant zero rather than
158 // the value contained in the register. For this reason, the darwin
159 // assembler requires that we print r0 as 0 (no r) when used as the base.
160 if (MI->getOperand(OpNo).getReg() == PPC::R0)
163 printOperand(MI, OpNo, O);
165 printOperand(MI, OpNo+1, O);
170 /// stripRegisterPrefix - This method strips the character prefix from a
171 /// register name so that only the number is left. Used by for linux asm.
172 const char *stripRegisterPrefix(const char *RegName) {
173 switch (RegName[0]) {
176 case 'v': return RegName + 1;
177 case 'c': if (RegName[1] == 'r') return RegName + 2;
183 void PPCInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
185 const MCOperand &Op = MI->getOperand(OpNo);
187 const char *RegName = getRegisterName(Op.getReg());
188 // The linux and AIX assembler does not take register prefixes.
189 if (!isDarwinSyntax())
190 RegName = stripRegisterPrefix(RegName);
201 assert(Op.isExpr() && "unknown operand kind in printOperand");