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/MC/MCInstrInfo.h"
22 #include "llvm/ADT/APFloat.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/raw_ostream.h"
28 #include "PTXGenAsmWriter.inc"
30 PTXInstPrinter::PTXInstPrinter(const MCAsmInfo &MAI,
31 const MCInstrInfo &MII,
32 const MCRegisterInfo &MRI,
33 const MCSubtargetInfo &STI) :
34 MCInstPrinter(MAI, MII, MRI) {
35 // Initialize the set of available features.
36 setAvailableFeatures(STI.getFeatureBits());
39 void PTXInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
40 // Decode the register number into type and offset
41 unsigned RegSpace = RegNo & 0x7;
42 unsigned RegType = (RegNo >> 3) & 0x7;
43 unsigned RegOffset = RegNo >> 6;
50 llvm_unreachable("Unknown register space!");
51 case PTXRegisterSpace::Reg:
54 llvm_unreachable("Unknown register type!");
55 case PTXRegisterType::Pred:
58 case PTXRegisterType::B16:
61 case PTXRegisterType::B32:
64 case PTXRegisterType::B64:
67 case PTXRegisterType::F32:
70 case PTXRegisterType::F64:
75 case PTXRegisterSpace::Return:
78 case PTXRegisterSpace::Argument:
86 void PTXInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
88 printPredicate(MI, O);
89 switch (MI->getOpcode()) {
91 printInstruction(MI, O);
97 printAnnotation(O, Annot);
100 void PTXInstPrinter::printPredicate(const MCInst *MI, raw_ostream &O) {
101 // The last two operands are the predicate operands
105 if (MI->getOpcode() == PTX::CALL) {
109 RegIndex = MI->getNumOperands()-2;
110 OpIndex = MI->getNumOperands()-1;
113 int PredOp = MI->getOperand(OpIndex).getImm();
114 if (PredOp == PTXPredicate::None)
117 if (PredOp == PTXPredicate::Negate)
122 printOperand(MI, RegIndex, O);
125 void PTXInstPrinter::printCall(const MCInst *MI, raw_ostream &O) {
127 // The first two operands are the predicate slot
129 unsigned NumRets = MI->getOperand(Index++).getImm();
133 printOperand(MI, Index++, O);
134 for (unsigned i = 1; i < NumRets; ++i) {
136 printOperand(MI, Index++, O);
141 const MCExpr* Expr = MI->getOperand(Index++).getExpr();
142 unsigned NumArgs = MI->getOperand(Index++).getImm();
144 // if the function call is to printf or puts, change to vprintf
145 if (const MCSymbolRefExpr *SymRefExpr = dyn_cast<MCSymbolRefExpr>(Expr)) {
146 const MCSymbol &Sym = SymRefExpr->getSymbol();
147 if (Sym.getName() == "printf" || Sym.getName() == "puts") {
159 printOperand(MI, Index++, O);
160 for (unsigned i = 1; i < NumArgs; ++i) {
162 printOperand(MI, Index++, O);
168 void PTXInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
170 const MCOperand &Op = MI->getOperand(OpNo);
173 } else if (Op.isFPImm()) {
174 double Imm = Op.getFPImm();
176 APInt FPIntImm = FPImm.bitcastToAPInt();
178 // PTX requires us to output the full 64 bits, even if the number is zero
179 if (FPIntImm.getZExtValue() > 0) {
180 O << FPIntImm.toString(16, false);
182 O << "0000000000000000";
184 } else if (Op.isReg()) {
185 printRegName(O, Op.getReg());
187 assert(Op.isExpr() && "unknown operand kind in printOperand");
188 const MCExpr *Expr = Op.getExpr();
189 if (const MCSymbolRefExpr *SymRefExpr = dyn_cast<MCSymbolRefExpr>(Expr)) {
190 const MCSymbol &Sym = SymRefExpr->getSymbol();
198 void PTXInstPrinter::printMemOperand(const MCInst *MI, unsigned OpNo,
200 // By definition, operand OpNo+1 is an i32imm
201 const MCOperand &Op2 = MI->getOperand(OpNo+1);
202 printOperand(MI, OpNo, O);
203 if (Op2.getImm() == 0)
204 return; // don't print "+0"
205 O << "+" << Op2.getImm();
208 void PTXInstPrinter::printRoundingMode(const MCInst *MI, unsigned OpNo,
210 const MCOperand &Op = MI->getOperand(OpNo);
211 assert (Op.isImm() && "Rounding modes must be immediate values");
212 switch (Op.getImm()) {
214 llvm_unreachable("Unknown rounding mode!");
215 case PTXRoundingMode::RndDefault:
216 llvm_unreachable("FP rounding-mode pass did not handle instruction!");
217 case PTXRoundingMode::RndNone:
218 // Do not print anything.
220 case PTXRoundingMode::RndNearestEven:
223 case PTXRoundingMode::RndTowardsZero:
226 case PTXRoundingMode::RndNegInf:
229 case PTXRoundingMode::RndPosInf:
232 case PTXRoundingMode::RndApprox:
235 case PTXRoundingMode::RndNearestEvenInt:
238 case PTXRoundingMode::RndTowardsZeroInt:
241 case PTXRoundingMode::RndNegInfInt:
244 case PTXRoundingMode::RndPosInfInt: