1 //===-- X86ATTInstPrinter.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 "llvm/MC/MCInst.h"
17 #include "X86ATTAsmPrinter.h"
18 #include "llvm/Target/TargetAsmInfo.h"
19 #include "llvm/Support/raw_ostream.h"
22 // Include the auto-generated portion of the assembly writer.
23 #define MachineInstr MCInst
24 #define NO_ASM_WRITER_BOILERPLATE
25 #include "X86GenAsmWriter.inc"
28 void X86ATTAsmPrinter::printSSECC(const MCInst *MI, unsigned Op) {
29 switch (MI->getOperand(Op).getImm()) {
30 default: assert(0 && "Invalid ssecc argument!");
31 case 0: O << "eq"; break;
32 case 1: O << "lt"; break;
33 case 2: O << "le"; break;
34 case 3: O << "unord"; break;
35 case 4: O << "neq"; break;
36 case 5: O << "nlt"; break;
37 case 6: O << "nle"; break;
38 case 7: O << "ord"; break;
43 void X86ATTAsmPrinter::printPICLabel(const MCInst *MI, unsigned Op) {
45 "This is only used for MOVPC32r, should lower before asm printing!");
49 /// print_pcrel_imm - This is used to print an immediate value that ends up
50 /// being encoded as a pc-relative value. These print slightly differently, for
51 /// example, a $ is not emitted.
52 void X86ATTAsmPrinter::print_pcrel_imm(const MCInst *MI, unsigned OpNo) {
53 const MCOperand &Op = MI->getOperand(OpNo);
57 else if (Op.isMBBLabel())
58 // FIXME: Keep in sync with printBasicBlockLabel. printBasicBlockLabel
59 // should eventually call into this code, not the other way around.
60 O << TAI->getPrivateGlobalPrefix() << "BB" << Op.getMBBLabelFunction()
61 << '_' << Op.getMBBLabelBlock();
63 assert(0 && "Unknown pcrel immediate operand");
67 void X86ATTAsmPrinter::printOperand(const MCInst *MI, unsigned OpNo,
68 const char *Modifier) {
69 assert(Modifier == 0 && "Modifiers should not be used");
71 const MCOperand &Op = MI->getOperand(OpNo);
74 unsigned Reg = Op.getReg();
76 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
77 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
78 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
79 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
80 Reg = getX86SubSuperRegister(Reg, VT);
83 O << TRI->getAsmName(Reg);
85 } else if (Op.isImm()) {
86 //if (!Modifier || (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
92 O << "<<UNKNOWN OPERAND KIND>>";
95 void X86ATTAsmPrinter::printLeaMemReference(const MCInst *MI, unsigned Op) {
97 const MCOperand &BaseReg = MI->getOperand(Op);
98 const MCOperand &IndexReg = MI->getOperand(Op+2);
99 const MCOperand &DispSpec = MI->getOperand(Op+3);
101 if (DispSpec.isImm()) {
102 int64_t DispVal = DispSpec.getImm();
103 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
107 //assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
108 // DispSpec.isJTI() || DispSpec.isSymbol());
109 //printOperand(MI, Op+3, "mem");
112 if (IndexReg.getReg() || BaseReg.getReg()) {
113 // There are cases where we can end up with ESP/RSP in the indexreg slot.
114 // If this happens, swap the base/index register to support assemblers that
115 // don't work when the index is *SP.
116 // FIXME: REMOVE THIS.
117 assert(IndexReg.getReg() != X86::ESP && IndexReg.getReg() != X86::RSP);
120 if (BaseReg.getReg())
121 printOperand(MI, Op);
123 if (IndexReg.getReg()) {
125 printOperand(MI, Op+2);
126 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
128 O << ',' << ScaleVal;
134 void X86ATTAsmPrinter::printMemReference(const MCInst *MI, unsigned Op) {
135 const MCOperand &Segment = MI->getOperand(Op+4);
136 if (Segment.getReg()) {
137 printOperand(MI, Op+4);
140 printLeaMemReference(MI, Op);