1 //===-- X86IntelInstPrinter.cpp - AT&T assembly instruction printing ------===//
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 file includes code for rendering MCInst instances as AT&T-style
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
16 #include "X86IntelInstPrinter.h"
17 #include "llvm/MC/MCInst.h"
18 #include "llvm/MC/MCAsmInfo.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/FormattedStream.h"
22 #include "X86GenInstrNames.inc"
25 // Include the auto-generated portion of the assembly writer.
26 #define MachineInstr MCInst
27 #define NO_ASM_WRITER_BOILERPLATE
28 #include "X86GenAsmWriter1.inc"
31 void X86IntelInstPrinter::printInst(const MCInst *MI) { printInstruction(MI); }
33 void X86IntelInstPrinter::printSSECC(const MCInst *MI, unsigned Op) {
34 switch (MI->getOperand(Op).getImm()) {
35 default: llvm_unreachable("Invalid ssecc argument!");
36 case 0: O << "eq"; break;
37 case 1: O << "lt"; break;
38 case 2: O << "le"; break;
39 case 3: O << "unord"; break;
40 case 4: O << "neq"; break;
41 case 5: O << "nlt"; break;
42 case 6: O << "nle"; break;
43 case 7: O << "ord"; break;
47 /// print_pcrel_imm - This is used to print an immediate value that ends up
48 /// being encoded as a pc-relative value.
49 void X86IntelInstPrinter::print_pcrel_imm(const MCInst *MI, unsigned OpNo) {
50 const MCOperand &Op = MI->getOperand(OpNo);
54 assert(Op.isExpr() && "unknown pcrel immediate operand");
55 Op.getExpr()->print(O, &MAI);
59 static void PrintRegName(raw_ostream &O, StringRef RegName) {
60 for (unsigned i = 0, e = RegName.size(); i != e; ++i)
61 O << (char)toupper(RegName[i]);
64 void X86IntelInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
65 const char *Modifier) {
66 assert(Modifier == 0 && "Modifiers should not be used");
68 const MCOperand &Op = MI->getOperand(OpNo);
70 PrintRegName(O, getRegisterName(Op.getReg()));
71 } else if (Op.isImm()) {
74 assert(Op.isExpr() && "unknown operand kind in printOperand");
75 Op.getExpr()->print(O, &MAI);
79 void X86IntelInstPrinter::printLeaMemReference(const MCInst *MI, unsigned Op) {
80 const MCOperand &BaseReg = MI->getOperand(Op);
81 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
82 const MCOperand &IndexReg = MI->getOperand(Op+2);
83 const MCOperand &DispSpec = MI->getOperand(Op+3);
87 bool NeedPlus = false;
88 if (BaseReg.getReg()) {
93 if (IndexReg.getReg()) {
94 if (NeedPlus) O << " + ";
97 printOperand(MI, Op+2);
102 if (!DispSpec.isImm()) {
103 if (NeedPlus) O << " + ";
104 assert(DispSpec.isExpr() && "non-immediate displacement for LEA?");
105 DispSpec.getExpr()->print(O, &MAI);
107 int64_t DispVal = DispSpec.getImm();
108 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
124 void X86IntelInstPrinter::printMemReference(const MCInst *MI, unsigned Op) {
125 // If this has a segment register, print it.
126 if (MI->getOperand(Op+4).getReg()) {
127 printOperand(MI, Op+4);
130 printLeaMemReference(MI, Op);