1 //===-- NVPTXMCExpr.cpp - NVPTX specific MC expression classes ------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "NVPTXMCExpr.h"
11 #include "llvm/ADT/StringExtras.h"
12 #include "llvm/MC/MCAssembler.h"
13 #include "llvm/MC/MCContext.h"
14 using namespace llvm;
15 
16 #define DEBUG_TYPE "nvptx-mcexpr"
17 
18 const NVPTXFloatMCExpr *
19 NVPTXFloatMCExpr::create(VariantKind Kind, const APFloat &Flt, MCContext &Ctx) {
20   return new (Ctx) NVPTXFloatMCExpr(Kind, Flt);
21 }
22 
23 void NVPTXFloatMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
24   bool Ignored;
25   unsigned NumHex;
26   APFloat APF = getAPFloat();
27 
28   switch (Kind) {
29   default: llvm_unreachable("Invalid kind!");
30   case VK_NVPTX_HALF_PREC_FLOAT:
31     // ptxas does not have a way to specify half-precision floats.
32     // Instead we have to print and load fp16 constants as .b16
33     OS << "0x";
34     NumHex = 4;
35     APF.convert(APFloat::IEEEhalf(), APFloat::rmNearestTiesToEven, &Ignored);
36     break;
37   case VK_NVPTX_SINGLE_PREC_FLOAT:
38     OS << "0f";
39     NumHex = 8;
40     APF.convert(APFloat::IEEEsingle(), APFloat::rmNearestTiesToEven, &Ignored);
41     break;
42   case VK_NVPTX_DOUBLE_PREC_FLOAT:
43     OS << "0d";
44     NumHex = 16;
45     APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven, &Ignored);
46     break;
47   }
48 
49   APInt API = APF.bitcastToAPInt();
50   std::string HexStr(utohexstr(API.getZExtValue()));
51   if (HexStr.length() < NumHex)
52     OS << std::string(NumHex - HexStr.length(), '0');
53   OS << utohexstr(API.getZExtValue());
54 }
55 
56 const NVPTXGenericMCSymbolRefExpr*
57 NVPTXGenericMCSymbolRefExpr::create(const MCSymbolRefExpr *SymExpr,
58                                     MCContext &Ctx) {
59   return new (Ctx) NVPTXGenericMCSymbolRefExpr(SymExpr);
60 }
61 
62 void NVPTXGenericMCSymbolRefExpr::printImpl(raw_ostream &OS,
63                                             const MCAsmInfo *MAI) const {
64   OS << "generic(";
65   SymExpr->print(OS, MAI);
66   OS << ")";
67 }
68