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 "MCTargetDesc/PPCBaseInfo.h"
17 #include "MCTargetDesc/PPCPredicates.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCInstrInfo.h"
21 #include "llvm/Support/raw_ostream.h"
24 #include "PPCGenAsmWriter.inc"
26 void PPCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
27 OS << getRegisterName(RegNo);
30 void PPCInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
32 // Check for slwi/srwi mnemonics.
33 if (MI->getOpcode() == PPC::RLWINM) {
34 unsigned char SH = MI->getOperand(2).getImm();
35 unsigned char MB = MI->getOperand(3).getImm();
36 unsigned char ME = MI->getOperand(4).getImm();
37 bool useSubstituteMnemonic = false;
38 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
39 O << "\tslwi "; useSubstituteMnemonic = true;
41 if (SH <= 31 && MB == (32-SH) && ME == 31) {
42 O << "\tsrwi "; useSubstituteMnemonic = true;
45 if (useSubstituteMnemonic) {
46 printOperand(MI, 0, O);
48 printOperand(MI, 1, O);
49 O << ", " << (unsigned int)SH;
51 printAnnotation(O, Annot);
56 if ((MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) &&
57 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
59 printOperand(MI, 0, O);
61 printOperand(MI, 1, O);
62 printAnnotation(O, Annot);
66 if (MI->getOpcode() == PPC::RLDICR) {
67 unsigned char SH = MI->getOperand(2).getImm();
68 unsigned char ME = MI->getOperand(3).getImm();
69 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
72 printOperand(MI, 0, O);
74 printOperand(MI, 1, O);
75 O << ", " << (unsigned int)SH;
76 printAnnotation(O, Annot);
81 printInstruction(MI, O);
82 printAnnotation(O, Annot);
86 void PPCInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNo,
88 const char *Modifier) {
89 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
90 unsigned Code = MI->getOperand(OpNo).getImm();
91 if (StringRef(Modifier) == "cc") {
92 switch ((PPC::Predicate)Code) {
93 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
94 case PPC::PRED_LT: O << "lt"; return;
95 case PPC::PRED_LE: O << "le"; return;
96 case PPC::PRED_EQ: O << "eq"; return;
97 case PPC::PRED_GE: O << "ge"; return;
98 case PPC::PRED_GT: O << "gt"; return;
99 case PPC::PRED_NE: O << "ne"; return;
100 case PPC::PRED_UN: O << "un"; return;
101 case PPC::PRED_NU: O << "nu"; return;
105 assert(StringRef(Modifier) == "reg" &&
106 "Need to specify 'cc' or 'reg' as predicate op modifier!");
107 // Don't print the register for 'always'.
108 if (Code == PPC::PRED_ALWAYS) return;
109 printOperand(MI, OpNo+1, O);
112 void PPCInstPrinter::printS5ImmOperand(const MCInst *MI, unsigned OpNo,
114 char Value = MI->getOperand(OpNo).getImm();
115 Value = (Value << (32-5)) >> (32-5);
119 void PPCInstPrinter::printU5ImmOperand(const MCInst *MI, unsigned OpNo,
121 unsigned char Value = MI->getOperand(OpNo).getImm();
122 assert(Value <= 31 && "Invalid u5imm argument!");
123 O << (unsigned int)Value;
126 void PPCInstPrinter::printU6ImmOperand(const MCInst *MI, unsigned OpNo,
128 unsigned char Value = MI->getOperand(OpNo).getImm();
129 assert(Value <= 63 && "Invalid u6imm argument!");
130 O << (unsigned int)Value;
133 void PPCInstPrinter::printS16ImmOperand(const MCInst *MI, unsigned OpNo,
135 O << (short)MI->getOperand(OpNo).getImm();
138 void PPCInstPrinter::printU16ImmOperand(const MCInst *MI, unsigned OpNo,
140 O << (unsigned short)MI->getOperand(OpNo).getImm();
143 void PPCInstPrinter::printS16X4ImmOperand(const MCInst *MI, unsigned OpNo,
145 if (MI->getOperand(OpNo).isImm())
146 O << (short)(MI->getOperand(OpNo).getImm()*4);
148 printOperand(MI, OpNo, O);
151 void PPCInstPrinter::printBranchOperand(const MCInst *MI, unsigned OpNo,
153 if (!MI->getOperand(OpNo).isImm())
154 return printOperand(MI, OpNo, O);
156 // Branches can take an immediate operand. This is used by the branch
157 // selection pass to print $+8, an eight byte displacement from the PC.
159 printAbsAddrOperand(MI, OpNo, O);
162 void PPCInstPrinter::printAbsAddrOperand(const MCInst *MI, unsigned OpNo,
164 O << (int)MI->getOperand(OpNo).getImm()*4;
168 void PPCInstPrinter::printcrbitm(const MCInst *MI, unsigned OpNo,
170 unsigned CCReg = MI->getOperand(OpNo).getReg();
173 default: llvm_unreachable("Unknown CR register");
174 case PPC::CR0: RegNo = 0; break;
175 case PPC::CR1: RegNo = 1; break;
176 case PPC::CR2: RegNo = 2; break;
177 case PPC::CR3: RegNo = 3; break;
178 case PPC::CR4: RegNo = 4; break;
179 case PPC::CR5: RegNo = 5; break;
180 case PPC::CR6: RegNo = 6; break;
181 case PPC::CR7: RegNo = 7; break;
183 O << (0x80 >> RegNo);
186 void PPCInstPrinter::printMemRegImm(const MCInst *MI, unsigned OpNo,
188 printSymbolLo(MI, OpNo, O);
190 if (MI->getOperand(OpNo+1).getReg() == PPC::R0)
193 printOperand(MI, OpNo+1, O);
197 void PPCInstPrinter::printMemRegImmShifted(const MCInst *MI, unsigned OpNo,
199 if (MI->getOperand(OpNo).isImm())
200 printS16X4ImmOperand(MI, OpNo, O);
202 printSymbolLo(MI, OpNo, O);
205 if (MI->getOperand(OpNo+1).getReg() == PPC::R0)
208 printOperand(MI, OpNo+1, O);
213 void PPCInstPrinter::printMemRegReg(const MCInst *MI, unsigned OpNo,
215 // When used as the base register, r0 reads constant zero rather than
216 // the value contained in the register. For this reason, the darwin
217 // assembler requires that we print r0 as 0 (no r) when used as the base.
218 if (MI->getOperand(OpNo).getReg() == PPC::R0)
221 printOperand(MI, OpNo, O);
223 printOperand(MI, OpNo+1, O);
228 /// stripRegisterPrefix - This method strips the character prefix from a
229 /// register name so that only the number is left. Used by for linux asm.
230 static const char *stripRegisterPrefix(const char *RegName) {
231 switch (RegName[0]) {
234 case 'v': return RegName + 1;
235 case 'c': if (RegName[1] == 'r') return RegName + 2;
241 void PPCInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
243 const MCOperand &Op = MI->getOperand(OpNo);
245 const char *RegName = getRegisterName(Op.getReg());
246 // The linux and AIX assembler does not take register prefixes.
247 if (!isDarwinSyntax())
248 RegName = stripRegisterPrefix(RegName);
259 assert(Op.isExpr() && "unknown operand kind in printOperand");
263 void PPCInstPrinter::printSymbolLo(const MCInst *MI, unsigned OpNo,
265 if (MI->getOperand(OpNo).isImm())
266 return printS16ImmOperand(MI, OpNo, O);
268 // FIXME: This is a terrible hack because we can't encode lo16() as an operand
269 // flag of a subtraction. See the FIXME in GetSymbolRef in PPCMCInstLower.
270 if (MI->getOperand(OpNo).isExpr() &&
271 isa<MCBinaryExpr>(MI->getOperand(OpNo).getExpr())) {
273 printOperand(MI, OpNo, O);
276 printOperand(MI, OpNo, O);
280 void PPCInstPrinter::printSymbolHi(const MCInst *MI, unsigned OpNo,
282 if (MI->getOperand(OpNo).isImm())
283 return printS16ImmOperand(MI, OpNo, O);
285 // FIXME: This is a terrible hack because we can't encode lo16() as an operand
286 // flag of a subtraction. See the FIXME in GetSymbolRef in PPCMCInstLower.
287 if (MI->getOperand(OpNo).isExpr() &&
288 isa<MCBinaryExpr>(MI->getOperand(OpNo).getExpr())) {
290 printOperand(MI, OpNo, O);
293 printOperand(MI, OpNo, O);