1 //===-- PTXInstPrinter.cpp - Convert PTX 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 a PTX MCInst to a .ptx file.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "asm-printer"
15 #include "PTXInstPrinter.h"
16 #include "MCTargetDesc/PTXBaseInfo.h"
17 #include "llvm/MC/MCAsmInfo.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCSymbol.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/Support/ErrorHandling.h"
23 #include "llvm/Support/raw_ostream.h"
26 #define GET_INSTRUCTION_NAME
27 #include "PTXGenAsmWriter.inc"
29 PTXInstPrinter::PTXInstPrinter(const MCAsmInfo &MAI,
30 const MCRegisterInfo &MRI,
31 const MCSubtargetInfo &STI) :
32 MCInstPrinter(MAI, MRI) {
33 // Initialize the set of available features.
34 setAvailableFeatures(STI.getFeatureBits());
37 StringRef PTXInstPrinter::getOpcodeName(unsigned Opcode) const {
38 return getInstructionName(Opcode);
41 void PTXInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
42 // Decode the register number into type and offset
43 unsigned RegSpace = RegNo & 0x7;
44 unsigned RegType = (RegNo >> 3) & 0x7;
45 unsigned RegOffset = RegNo >> 6;
52 llvm_unreachable("Unknown register space!");
53 case PTXRegisterSpace::Reg:
56 llvm_unreachable("Unknown register type!");
57 case PTXRegisterType::Pred:
60 case PTXRegisterType::B16:
63 case PTXRegisterType::B32:
66 case PTXRegisterType::B64:
69 case PTXRegisterType::F32:
72 case PTXRegisterType::F64:
77 case PTXRegisterSpace::Return:
80 case PTXRegisterSpace::Argument:
88 void PTXInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
90 printPredicate(MI, O);
91 switch (MI->getOpcode()) {
93 printInstruction(MI, O);
99 printAnnotation(O, Annot);
102 void PTXInstPrinter::printPredicate(const MCInst *MI, raw_ostream &O) {
103 // The last two operands are the predicate operands
107 if (MI->getOpcode() == PTX::CALL) {
111 RegIndex = MI->getNumOperands()-2;
112 OpIndex = MI->getNumOperands()-1;
115 int PredOp = MI->getOperand(OpIndex).getImm();
116 if (PredOp == PTXPredicate::None)
119 if (PredOp == PTXPredicate::Negate)
124 printOperand(MI, RegIndex, O);
127 void PTXInstPrinter::printCall(const MCInst *MI, raw_ostream &O) {
129 // The first two operands are the predicate slot
131 unsigned NumRets = MI->getOperand(Index++).getImm();
135 printOperand(MI, Index++, O);
136 for (unsigned i = 1; i < NumRets; ++i) {
138 printOperand(MI, Index++, O);
143 const MCExpr* Expr = MI->getOperand(Index++).getExpr();
144 unsigned NumArgs = MI->getOperand(Index++).getImm();
146 // if the function call is to printf or puts, change to vprintf
147 if (const MCSymbolRefExpr *SymRefExpr = dyn_cast<MCSymbolRefExpr>(Expr)) {
148 const MCSymbol &Sym = SymRefExpr->getSymbol();
149 if (Sym.getName() == "printf" || Sym.getName() == "puts") {
161 printOperand(MI, Index++, O);
162 for (unsigned i = 1; i < NumArgs; ++i) {
164 printOperand(MI, Index++, O);
170 void PTXInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
172 const MCOperand &Op = MI->getOperand(OpNo);
175 } else if (Op.isFPImm()) {
176 double Imm = Op.getFPImm();
178 APInt FPIntImm = FPImm.bitcastToAPInt();
180 // PTX requires us to output the full 64 bits, even if the number is zero
181 if (FPIntImm.getZExtValue() > 0) {
182 O << FPIntImm.toString(16, false);
184 O << "0000000000000000";
186 } else if (Op.isReg()) {
187 printRegName(O, Op.getReg());
189 assert(Op.isExpr() && "unknown operand kind in printOperand");
190 const MCExpr *Expr = Op.getExpr();
191 if (const MCSymbolRefExpr *SymRefExpr = dyn_cast<MCSymbolRefExpr>(Expr)) {
192 const MCSymbol &Sym = SymRefExpr->getSymbol();
200 void PTXInstPrinter::printMemOperand(const MCInst *MI, unsigned OpNo,
202 // By definition, operand OpNo+1 is an i32imm
203 const MCOperand &Op2 = MI->getOperand(OpNo+1);
204 printOperand(MI, OpNo, O);
205 if (Op2.getImm() == 0)
206 return; // don't print "+0"
207 O << "+" << Op2.getImm();
210 void PTXInstPrinter::printRoundingMode(const MCInst *MI, unsigned OpNo,
212 const MCOperand &Op = MI->getOperand(OpNo);
213 assert (Op.isImm() && "Rounding modes must be immediate values");
214 switch (Op.getImm()) {
216 llvm_unreachable("Unknown rounding mode!");
217 case PTXRoundingMode::RndDefault:
218 llvm_unreachable("FP rounding-mode pass did not handle instruction!");
219 case PTXRoundingMode::RndNone:
220 // Do not print anything.
222 case PTXRoundingMode::RndNearestEven:
225 case PTXRoundingMode::RndTowardsZero:
228 case PTXRoundingMode::RndNegInf:
231 case PTXRoundingMode::RndPosInf:
234 case PTXRoundingMode::RndApprox:
237 case PTXRoundingMode::RndNearestEvenInt:
240 case PTXRoundingMode::RndTowardsZeroInt:
243 case PTXRoundingMode::RndNegInfInt:
246 case PTXRoundingMode::RndPosInfInt: